diff --git a/Sources/KSCrashFilters/KSCrashReportFilterAlert.m b/Sources/KSCrashFilters/KSCrashReportFilterAlert.m
index c4859cad..016f1682 100644
--- a/Sources/KSCrashFilters/KSCrashReportFilterAlert.m
+++ b/Sources/KSCrashFilters/KSCrashReportFilterAlert.m
@@ -61,10 +61,6 @@ - (void)startWithTitle:(NSString *)title
 
 @implementation KSCrashAlertViewProcess
 
-@synthesize reports = _reports;
-@synthesize onCompletion = _onCompletion;
-@synthesize expectedButtonIndex = _expectedButtonIndex;
-
 + (KSCrashAlertViewProcess *)process
 {
     return [[self alloc] init];
@@ -78,9 +74,9 @@ - (void)startWithTitle:(NSString *)title
           onCompletion:(KSCrashReportFilterCompletion)onCompletion
 {
     KSLOG_TRACE(@"Starting alert view process");
-    self.reports = [reports copy];
-    self.onCompletion = onCompletion;
-    self.expectedButtonIndex = noAnswer == nil ? 0 : 1;
+    _reports = [reports copy];
+    _onCompletion = [onCompletion copy];
+    _expectedButtonIndex = noAnswer == nil ? 0 : 1;
 
 #if KSCRASH_HAS_UIALERTCONTROLLER
     UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title
@@ -130,20 +126,15 @@ - (void)alertView:(__unused id)alertView clickedButtonAtIndex:(NSInteger)buttonI
 
 @interface KSCrashReportFilterAlert ()
 
-@property(nonatomic, readwrite, retain) NSString *title;
-@property(nonatomic, readwrite, retain) NSString *message;
-@property(nonatomic, readwrite, retain) NSString *yesAnswer;
-@property(nonatomic, readwrite, retain) NSString *noAnswer;
+@property(nonatomic, readwrite, copy) NSString *title;
+@property(nonatomic, readwrite, copy) NSString *message;
+@property(nonatomic, readwrite, copy) NSString *yesAnswer;
+@property(nonatomic, readwrite, copy) NSString *noAnswer;
 
 @end
 
 @implementation KSCrashReportFilterAlert
 
-@synthesize title = _title;
-@synthesize message = _message;
-@synthesize yesAnswer = _yesAnswer;
-@synthesize noAnswer = _noAnswer;
-
 + (instancetype)filterWithTitle:(NSString *)title
                         message:(nullable NSString *)message
                       yesAnswer:(NSString *)yesAnswer
@@ -158,10 +149,10 @@ - (instancetype)initWithTitle:(NSString *)title
                      noAnswer:(nullable NSString *)noAnswer;
 {
     if ((self = [super init])) {
-        self.title = title;
-        self.message = message;
-        self.yesAnswer = yesAnswer;
-        self.noAnswer = noAnswer;
+        _title = [title copy];
+        _message = [message copy];
+        _yesAnswer = [yesAnswer copy];
+        _noAnswer = [noAnswer copy];
     }
     return self;
 }
diff --git a/Sources/KSCrashFilters/KSCrashReportFilterAppleFmt.m b/Sources/KSCrashFilters/KSCrashReportFilterAppleFmt.m
index 71071abb..4590eaa3 100644
--- a/Sources/KSCrashFilters/KSCrashReportFilterAppleFmt.m
+++ b/Sources/KSCrashFilters/KSCrashReportFilterAppleFmt.m
@@ -130,8 +130,6 @@ - (NSComparisonResult)kscrash_compareRegisterName:(NSString *)other
 
 @implementation KSCrashReportFilterAppleFmt
 
-@synthesize reportStyle = _reportStyle;
-
 /** Date formatter for Apple date format in crash reports. */
 static NSDateFormatter *g_dateFormatter;
 
@@ -176,7 +174,7 @@ + (instancetype)filterWithReportStyle:(KSAppleReportStyle)reportStyle
 - (instancetype)initWithReportStyle:(KSAppleReportStyle)reportStyle
 {
     if ((self = [super init])) {
-        self.reportStyle = reportStyle;
+        _reportStyle = reportStyle;
     }
     return self;
 }
diff --git a/Sources/KSCrashFilters/KSCrashReportFilterBasic.m b/Sources/KSCrashFilters/KSCrashReportFilterBasic.m
index 5cf4d724..9fb7df8b 100644
--- a/Sources/KSCrashFilters/KSCrashReportFilterBasic.m
+++ b/Sources/KSCrashFilters/KSCrashReportFilterBasic.m
@@ -49,21 +49,18 @@ - (void)filterReports:(NSArray<KSCrashReport *> *)reports onCompletion:(KSCrashR
 
 @interface KSCrashReportFilterCombine ()
 
-@property(nonatomic, readwrite, retain) NSArray *filters;
-@property(nonatomic, readwrite, retain) NSArray *keys;
+@property(nonatomic, readwrite, copy) NSArray *filters;
+@property(nonatomic, readwrite, copy) NSArray *keys;
 
 @end
 
 @implementation KSCrashReportFilterCombine
 
-@synthesize filters = _filters;
-@synthesize keys = _keys;
-
 - (instancetype)initWithFilters:(NSArray *)filters keys:(NSArray<NSString *> *)keys
 {
     if ((self = [super init])) {
-        self.filters = filters;
-        self.keys = keys;
+        _filters = [filters copy];
+        _keys = [keys copy];
     }
     return self;
 }
@@ -207,8 +204,6 @@ @interface KSCrashReportFilterPipeline ()
 
 @implementation KSCrashReportFilterPipeline
 
-@synthesize filters = _filters;
-
 + (instancetype)filterWithFilters:(id)firstFilter, ...
 {
     ksva_list_to_nsarray(firstFilter, filters);
@@ -303,16 +298,13 @@ - (void)filterReports:(NSArray<KSCrashReport *> *)reports onCompletion:(KSCrashR
 
 @interface KSCrashReportFilterConcatenate ()
 
-@property(nonatomic, readwrite, retain) NSString *separatorFmt;
-@property(nonatomic, readwrite, retain) NSArray<NSString *> *keys;
+@property(nonatomic, readwrite, copy) NSString *separatorFmt;
+@property(nonatomic, readwrite, copy) NSArray<NSString *> *keys;
 
 @end
 
 @implementation KSCrashReportFilterConcatenate
 
-@synthesize separatorFmt = _separatorFmt;
-@synthesize keys = _keys;
-
 + (instancetype)filterWithSeparatorFmt:(NSString *)separatorFmt keys:(id)firstKey, ...
 {
     ksva_list_to_nsarray(firstKey, keys);
@@ -342,8 +334,8 @@ - (instancetype)initWithSeparatorFmt:(NSString *)separatorFmt keysArray:(NSArray
             }
         }
 
-        self.separatorFmt = separatorFmt;
-        self.keys = realKeys;
+        _separatorFmt = [separatorFmt copy];
+        _keys = [realKeys copy];
     }
     return self;
 }
@@ -372,14 +364,12 @@ - (void)filterReports:(NSArray<KSCrashReport *> *)reports onCompletion:(KSCrashR
 
 @interface KSCrashReportFilterSubset ()
 
-@property(nonatomic, readwrite, retain) NSArray *keyPaths;
+@property(nonatomic, readwrite, copy) NSArray *keyPaths;
 
 @end
 
 @implementation KSCrashReportFilterSubset
 
-@synthesize keyPaths = _keyPaths;
-
 + (instancetype)filterWithKeys:(id)firstKeyPath, ...
 {
     ksva_list_to_nsarray(firstKeyPath, keyPaths);
@@ -409,7 +399,7 @@ - (instancetype)initWithKeysArray:(NSArray<NSString *> *)keyPaths
             }
         }
 
-        self.keyPaths = realKeyPaths;
+        _keyPaths = [realKeyPaths copy];
     }
     return self;
 }
diff --git a/Sources/KSCrashFilters/KSCrashReportFilterGZip.m b/Sources/KSCrashFilters/KSCrashReportFilterGZip.m
index 7efd792b..e513b059 100644
--- a/Sources/KSCrashFilters/KSCrashReportFilterGZip.m
+++ b/Sources/KSCrashFilters/KSCrashReportFilterGZip.m
@@ -39,8 +39,6 @@ @interface KSCrashReportFilterGZipCompress ()
 
 @implementation KSCrashReportFilterGZipCompress
 
-@synthesize compressionLevel = _compressionLevel;
-
 + (instancetype)filterWithCompressionLevel:(NSInteger)compressionLevel
 {
     return [[self alloc] initWithCompressionLevel:compressionLevel];
@@ -49,7 +47,7 @@ + (instancetype)filterWithCompressionLevel:(NSInteger)compressionLevel
 - (instancetype)initWithCompressionLevel:(NSInteger)compressionLevel
 {
     if ((self = [super init])) {
-        self.compressionLevel = compressionLevel;
+        _compressionLevel = compressionLevel;
     }
     return self;
 }
diff --git a/Sources/KSCrashFilters/KSCrashReportFilterJSON.m b/Sources/KSCrashFilters/KSCrashReportFilterJSON.m
index e0551cc2..f640cb02 100644
--- a/Sources/KSCrashFilters/KSCrashReportFilterJSON.m
+++ b/Sources/KSCrashFilters/KSCrashReportFilterJSON.m
@@ -38,8 +38,6 @@ @interface KSCrashReportFilterJSONEncode ()
 
 @implementation KSCrashReportFilterJSONEncode
 
-@synthesize encodeOptions = _encodeOptions;
-
 + (instancetype)filterWithOptions:(KSJSONEncodeOption)options
 {
     return [[self alloc] initWithOptions:options];
@@ -48,7 +46,7 @@ + (instancetype)filterWithOptions:(KSJSONEncodeOption)options
 - (instancetype)initWithOptions:(KSJSONEncodeOption)options
 {
     if ((self = [super init])) {
-        self.encodeOptions = options;
+        _encodeOptions = options;
     }
     return self;
 }
@@ -86,8 +84,6 @@ @interface KSCrashReportFilterJSONDecode ()
 
 @implementation KSCrashReportFilterJSONDecode
 
-@synthesize decodeOptions = _encodeOptions;
-
 + (instancetype)filterWithOptions:(KSJSONDecodeOption)options
 {
     return [[self alloc] initWithOptions:options];
@@ -96,7 +92,7 @@ + (instancetype)filterWithOptions:(KSJSONDecodeOption)options
 - (instancetype)initWithOptions:(KSJSONDecodeOption)options
 {
     if ((self = [super init])) {
-        self.decodeOptions = options;
+        _decodeOptions = options;
     }
     return self;
 }
diff --git a/Sources/KSCrashInstallations/KSCrashInstallation.m b/Sources/KSCrashInstallations/KSCrashInstallation.m
index 7c5e5b9d..ef6ce0a6 100644
--- a/Sources/KSCrashInstallations/KSCrashInstallation.m
+++ b/Sources/KSCrashInstallations/KSCrashInstallation.m
@@ -57,24 +57,17 @@ @interface KSCrashInstReportField : NSObject
 @property(nonatomic, readonly, assign) int index;
 @property(nonatomic, readonly, assign) ReportField *field;
 
-@property(nonatomic, readwrite, retain) NSString *key;
-@property(nonatomic, readwrite, retain) id value;
+@property(nonatomic, readwrite, copy) NSString *key;
+@property(nonatomic, readwrite, strong) id value;
 
-@property(nonatomic, readwrite, retain) NSMutableData *fieldBacking;
-@property(nonatomic, readwrite, retain) KSCString *keyBacking;
-@property(nonatomic, readwrite, retain) KSCString *valueBacking;
+@property(nonatomic, readwrite, strong) NSMutableData *fieldBacking;
+@property(nonatomic, readwrite, strong) KSCString *keyBacking;
+@property(nonatomic, readwrite, strong) KSCString *valueBacking;
 
 @end
 
 @implementation KSCrashInstReportField
 
-@synthesize index = _index;
-@synthesize key = _key;
-@synthesize value = _value;
-@synthesize fieldBacking = _fieldBacking;
-@synthesize keyBacking = _keyBacking;
-@synthesize valueBacking = _valueBacking;
-
 + (KSCrashInstReportField *)fieldWithIndex:(int)index
 {
     return [(KSCrashInstReportField *)[self alloc] initWithIndex:index];
@@ -84,7 +77,7 @@ - (id)initWithIndex:(int)index
 {
     if ((self = [super init])) {
         _index = index;
-        self.fieldBacking = [NSMutableData dataWithLength:sizeof(*self.field)];
+        _fieldBacking = [NSMutableData dataWithLength:sizeof(*self.field)];
     }
     return self;
 }
@@ -132,21 +125,15 @@ @interface KSCrashInstallation ()
 
 @property(nonatomic, readwrite, assign) int nextFieldIndex;
 @property(nonatomic, readonly, assign) CrashHandlerData *crashHandlerData;
-@property(nonatomic, readwrite, retain) NSMutableData *crashHandlerDataBacking;
-@property(nonatomic, readwrite, retain) NSMutableDictionary *fields;
-@property(nonatomic, readwrite, retain) NSArray *requiredProperties;
-@property(nonatomic, readwrite, retain) KSCrashReportFilterPipeline *prependedFilters;
+@property(nonatomic, readwrite, strong) NSMutableData *crashHandlerDataBacking;
+@property(nonatomic, readwrite, strong) NSMutableDictionary *fields;
+@property(nonatomic, readwrite, copy) NSArray *requiredProperties;
+@property(nonatomic, readwrite, strong) KSCrashReportFilterPipeline *prependedFilters;
 
 @end
 
 @implementation KSCrashInstallation
 
-@synthesize nextFieldIndex = _nextFieldIndex;
-@synthesize crashHandlerDataBacking = _crashHandlerDataBacking;
-@synthesize fields = _fields;
-@synthesize requiredProperties = _requiredProperties;
-@synthesize prependedFilters = _prependedFilters;
-
 - (id)init
 {
     [NSException raise:NSInternalInconsistencyException
@@ -157,12 +144,12 @@ - (id)init
 - (id)initWithRequiredProperties:(NSArray *)requiredProperties
 {
     if ((self = [super init])) {
-        self.crashHandlerDataBacking =
+        _crashHandlerDataBacking =
             [NSMutableData dataWithLength:sizeof(*self.crashHandlerData) +
                                           sizeof(*self.crashHandlerData->reportFields) * kMaxProperties];
-        self.fields = [NSMutableDictionary dictionary];
-        self.requiredProperties = requiredProperties;
-        self.prependedFilters = [KSCrashReportFilterPipeline filterWithFilters:nil];
+        _fields = [NSMutableDictionary dictionary];
+        _requiredProperties = [requiredProperties copy];
+        _prependedFilters = [KSCrashReportFilterPipeline filterWithFilters:nil];
     }
     return self;
 }
diff --git a/Sources/KSCrashInstallations/KSCrashInstallationConsole.m b/Sources/KSCrashInstallations/KSCrashInstallationConsole.m
index 5ed81c22..cafca7e5 100644
--- a/Sources/KSCrashInstallations/KSCrashInstallationConsole.m
+++ b/Sources/KSCrashInstallations/KSCrashInstallationConsole.m
@@ -33,8 +33,6 @@
 
 @implementation KSCrashInstallationConsole
 
-@synthesize printAppleFormat = _printAppleFormat;
-
 + (instancetype)sharedInstance
 {
     static KSCrashInstallationConsole *sharedInstance = nil;
@@ -49,7 +47,7 @@ + (instancetype)sharedInstance
 - (id)init
 {
     if ((self = [super initWithRequiredProperties:nil])) {
-        self.printAppleFormat = NO;
+        _printAppleFormat = NO;
     }
     return self;
 }
diff --git a/Sources/KSCrashInstallations/KSCrashInstallationEmail.m b/Sources/KSCrashInstallations/KSCrashInstallationEmail.m
index f8f67107..e5b69b9d 100644
--- a/Sources/KSCrashInstallations/KSCrashInstallationEmail.m
+++ b/Sources/KSCrashInstallations/KSCrashInstallationEmail.m
@@ -31,19 +31,12 @@
 
 @interface KSCrashInstallationEmail ()
 
-@property(nonatomic, readwrite, retain) NSDictionary *defaultFilenameFormats;
+@property(nonatomic, readwrite, copy) NSDictionary *defaultFilenameFormats;
 
 @end
 
 @implementation KSCrashInstallationEmail
 
-@synthesize recipients = _recipients;
-@synthesize subject = _subject;
-@synthesize message = _message;
-@synthesize filenameFmt = _filenameFmt;
-@synthesize reportStyle = _reportStyle;
-@synthesize defaultFilenameFormats = _defaultFilenameFormats;
-
 + (instancetype)sharedInstance
 {
     static KSCrashInstallationEmail *sharedInstance = nil;
@@ -60,8 +53,8 @@ - (id)init
     if ((self = [super
              initWithRequiredProperties:[NSArray arrayWithObjects:@"recipients", @"subject", @"filenameFmt", nil]])) {
         NSString *bundleName = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"];
-        self.subject = [NSString stringWithFormat:@"Crash Report (%@)", bundleName];
-        self.defaultFilenameFormats = [NSDictionary
+        _subject = [NSString stringWithFormat:@"Crash Report (%@)", bundleName];
+        _defaultFilenameFormats = [NSDictionary
             dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"crash-report-%@-%%d.txt.gz", bundleName],
                                          [NSNumber numberWithInt:KSCrashEmailReportStyleApple],
                                          [NSString stringWithFormat:@"crash-report-%@-%%d.json.gz", bundleName],
diff --git a/Sources/KSCrashInstallations/KSCrashInstallationStandard.m b/Sources/KSCrashInstallations/KSCrashInstallationStandard.m
index 3c08b348..adc879ee 100644
--- a/Sources/KSCrashInstallations/KSCrashInstallationStandard.m
+++ b/Sources/KSCrashInstallations/KSCrashInstallationStandard.m
@@ -31,8 +31,6 @@
 
 @implementation KSCrashInstallationStandard
 
-@synthesize url = _url;
-
 + (instancetype)sharedInstance
 {
     static KSCrashInstallationStandard *sharedInstance = nil;
diff --git a/Sources/KSCrashRecording/KSCrash.m b/Sources/KSCrashRecording/KSCrash.m
index 42289835..d41d0601 100644
--- a/Sources/KSCrashRecording/KSCrash.m
+++ b/Sources/KSCrashRecording/KSCrash.m
@@ -54,8 +54,8 @@
 
 @interface KSCrash ()
 
-@property(nonatomic, readwrite, retain) NSString *bundleName;
-@property(nonatomic, readwrite, retain) NSString *basePath;
+@property(nonatomic, readwrite, copy) NSString *bundleName;
+@property(nonatomic, readwrite, copy) NSString *basePath;
 @property(nonatomic, strong) KSCrashConfiguration *configuration;
 
 @end
@@ -94,16 +94,6 @@ @interface KSCrash ()
 
 @implementation KSCrash
 
-// ============================================================================
-#pragma mark - Properties -
-// ============================================================================
-
-@synthesize sink = _sink;
-@synthesize bundleName = _bundleName;
-@synthesize basePath = _basePath;
-@synthesize uncaughtExceptionHandler = _uncaughtExceptionHandler;
-@synthesize currentSnapshotUserReportedExceptionHandler = _currentSnapshotUserReportedExceptionHandler;
-
 // ============================================================================
 #pragma mark - Lifecycle -
 // ============================================================================
@@ -145,13 +135,13 @@ + (instancetype)sharedInstance
 
 - (instancetype)initWithBasePath:(NSString *)basePath
 {
+    if (basePath == nil) {
+        KSLOG_ERROR(@"Failed to initialize crash handler. Crash reporting disabled.");
+        return nil;
+    }
     if ((self = [super init])) {
-        self.bundleName = getBundleName();
-        self.basePath = basePath;
-        if (self.basePath == nil) {
-            KSLOG_ERROR(@"Failed to initialize crash handler. Crash reporting disabled.");
-            return nil;
-        }
+        _bundleName = getBundleName();
+        _basePath = [basePath copy];
     }
     return self;
 }
diff --git a/Sources/KSCrashRecording/KSCrashDoctor.m b/Sources/KSCrashRecording/KSCrashDoctor.m
index 54e1fcef..d701457f 100644
--- a/Sources/KSCrashRecording/KSCrashDoctor.m
+++ b/Sources/KSCrashRecording/KSCrashDoctor.m
@@ -14,38 +14,28 @@
 
 @interface KSCrashDoctorParam : NSObject
 
-@property(nonatomic, readwrite, retain) NSString *className;
-@property(nonatomic, readwrite, retain) NSString *previousClassName;
-@property(nonatomic, readwrite, retain) NSString *type;
+@property(nonatomic, readwrite, copy) NSString *className;
+@property(nonatomic, readwrite, copy) NSString *previousClassName;
+@property(nonatomic, readwrite, copy) NSString *type;
 @property(nonatomic, readwrite, assign) BOOL isInstance;
 @property(nonatomic, readwrite, assign) uintptr_t address;
-@property(nonatomic, readwrite, retain) NSString *value;
+@property(nonatomic, readwrite, copy) NSString *value;
 
 @end
 
 @implementation KSCrashDoctorParam
 
-@synthesize className = _className;
-@synthesize previousClassName = _previousClassName;
-@synthesize isInstance = _isInstance;
-@synthesize address = _address;
-@synthesize value = _value;
-@synthesize type = _type;
-
 @end
 
 @interface KSCrashDoctorFunctionCall : NSObject
 
-@property(nonatomic, readwrite, retain) NSString *name;
-@property(nonatomic, readwrite, retain) NSArray *params;
+@property(nonatomic, readwrite, copy) NSString *name;
+@property(nonatomic, readwrite, copy) NSArray *params;
 
 @end
 
 @implementation KSCrashDoctorFunctionCall
 
-@synthesize name = _name;
-@synthesize params = _params;
-
 - (NSString *)descriptionForObjCCall
 {
     if (![self.name isEqualToString:@"objc_msgSend"]) {
diff --git a/Sources/KSCrashRecording/Monitors/KSCrashMonitor_Deadlock.m b/Sources/KSCrashRecording/Monitors/KSCrashMonitor_Deadlock.m
index 49008bd1..40e9ce4b 100644
--- a/Sources/KSCrashRecording/Monitors/KSCrashMonitor_Deadlock.m
+++ b/Sources/KSCrashRecording/Monitors/KSCrashMonitor_Deadlock.m
@@ -62,23 +62,20 @@
 
 @interface KSCrashDeadlockMonitor : NSObject
 
-@property(nonatomic, readwrite, retain) NSThread *monitorThread;
+@property(nonatomic, readwrite, strong) NSThread *monitorThread;
 @property(atomic, readwrite, assign) BOOL awaitingResponse;
 
 @end
 
 @implementation KSCrashDeadlockMonitor
 
-@synthesize monitorThread = _monitorThread;
-@synthesize awaitingResponse = _awaitingResponse;
-
 - (id)init
 {
     if ((self = [super init])) {
         // target (self) is retained until selector (runMonitor) exits.
-        self.monitorThread = [[NSThread alloc] initWithTarget:self selector:@selector(runMonitor) object:nil];
-        self.monitorThread.name = @"KSCrash Deadlock Detection Thread";
-        [self.monitorThread start];
+        _monitorThread = [[NSThread alloc] initWithTarget:self selector:@selector(runMonitor) object:nil];
+        _monitorThread.name = @"KSCrash Deadlock Detection Thread";
+        [_monitorThread start];
     }
     return self;
 }
diff --git a/Sources/KSCrashRecordingCore/KSJSONCodecObjC.m b/Sources/KSCrashRecordingCore/KSJSONCodecObjC.m
index eaeb0303..f99ccf3a 100644
--- a/Sources/KSCrashRecordingCore/KSJSONCodecObjC.m
+++ b/Sources/KSCrashRecordingCore/KSJSONCodecObjC.m
@@ -38,19 +38,19 @@ @interface KSJSONCodec ()
 @property(nonatomic, readwrite, assign) KSJSONDecodeCallbacks *callbacks;
 
 /** Stack of arrays/objects as the decoded content is built */
-@property(nonatomic, readwrite, retain) NSMutableArray *containerStack;
+@property(nonatomic, readwrite, strong) NSMutableArray *containerStack;
 
 /** Current array or object being decoded (weak ref) */
 @property(nonatomic, readwrite, assign) id currentContainer;
 
 /** Top level array or object in the decoded tree */
-@property(nonatomic, readwrite, retain) id topLevelContainer;
+@property(nonatomic, readwrite, strong) id topLevelContainer;
 
 /** Data that has been serialized into JSON form */
-@property(nonatomic, readwrite, retain) NSMutableData *serializedData;
+@property(nonatomic, readwrite, strong) NSMutableData *serializedData;
 
 /** Any error that has occurred */
-@property(nonatomic, readwrite, retain) NSError *error;
+@property(nonatomic, readwrite, strong) NSError *error;
 
 /** If true, pretty print while encoding */
 @property(nonatomic, readwrite, assign) bool prettyPrint;
@@ -94,19 +94,6 @@ - (id)initWithEncodeOptions:(KSJSONEncodeOption)encodeOptions decodeOptions:(KSJ
 
 @implementation KSJSONCodec
 
-#pragma mark Properties
-
-@synthesize topLevelContainer = _topLevelContainer;
-@synthesize currentContainer = _currentContainer;
-@synthesize containerStack = _containerStack;
-@synthesize callbacks = _callbacks;
-@synthesize serializedData = _serializedData;
-@synthesize error = _error;
-@synthesize prettyPrint = _prettyPrint;
-@synthesize sorted = _sorted;
-@synthesize ignoreNullsInArrays = _ignoreNullsInArrays;
-@synthesize ignoreNullsInObjects = _ignoreNullsInObjects;
-
 #pragma mark Constructors/Destructor
 
 + (KSJSONCodec *)codecWithEncodeOptions:(KSJSONEncodeOption)encodeOptions
@@ -118,21 +105,21 @@ + (KSJSONCodec *)codecWithEncodeOptions:(KSJSONEncodeOption)encodeOptions
 - (id)initWithEncodeOptions:(KSJSONEncodeOption)encodeOptions decodeOptions:(KSJSONDecodeOption)decodeOptions
 {
     if ((self = [super init])) {
-        self.containerStack = [NSMutableArray array];
-        self.callbacks = malloc(sizeof(*self.callbacks));
-        self.callbacks->onBeginArray = onBeginArray;
-        self.callbacks->onBeginObject = onBeginObject;
-        self.callbacks->onBooleanElement = onBooleanElement;
-        self.callbacks->onEndContainer = onEndContainer;
-        self.callbacks->onEndData = onEndData;
-        self.callbacks->onFloatingPointElement = onFloatingPointElement;
-        self.callbacks->onIntegerElement = onIntegerElement;
-        self.callbacks->onNullElement = onNullElement;
-        self.callbacks->onStringElement = onStringElement;
-        self.prettyPrint = (encodeOptions & KSJSONEncodeOptionPretty) != 0;
-        self.sorted = (encodeOptions & KSJSONEncodeOptionSorted) != 0;
-        self.ignoreNullsInArrays = (decodeOptions & KSJSONDecodeOptionIgnoreNullInArray) != 0;
-        self.ignoreNullsInObjects = (decodeOptions & KSJSONDecodeOptionIgnoreNullInObject) != 0;
+        _containerStack = [NSMutableArray array];
+        _callbacks = malloc(sizeof(*self.callbacks));
+        _callbacks->onBeginArray = onBeginArray;
+        _callbacks->onBeginObject = onBeginObject;
+        _callbacks->onBooleanElement = onBooleanElement;
+        _callbacks->onEndContainer = onEndContainer;
+        _callbacks->onEndData = onEndData;
+        _callbacks->onFloatingPointElement = onFloatingPointElement;
+        _callbacks->onIntegerElement = onIntegerElement;
+        _callbacks->onNullElement = onNullElement;
+        _callbacks->onStringElement = onStringElement;
+        _prettyPrint = (encodeOptions & KSJSONEncodeOptionPretty) != 0;
+        _sorted = (encodeOptions & KSJSONEncodeOptionSorted) != 0;
+        _ignoreNullsInArrays = (decodeOptions & KSJSONDecodeOptionIgnoreNullInArray) != 0;
+        _ignoreNullsInObjects = (decodeOptions & KSJSONDecodeOptionIgnoreNullInObject) != 0;
     }
     return self;
 }
diff --git a/Sources/KSCrashReportingCore/KSCString.m b/Sources/KSCrashReportingCore/KSCString.m
index 2c6f09ec..bab4d630 100644
--- a/Sources/KSCrashReportingCore/KSCString.m
+++ b/Sources/KSCrashReportingCore/KSCString.m
@@ -28,9 +28,6 @@
 
 @implementation KSCString
 
-@synthesize length = _length;
-@synthesize bytes = _bytes;
-
 + (KSCString *)stringWithString:(NSString *)string
 {
     return [[self alloc] initWithString:string];
diff --git a/Sources/KSCrashReportingCore/KSHTTPMultipartPostBody.m b/Sources/KSCrashReportingCore/KSHTTPMultipartPostBody.m
index 31a3a381..e036541c 100644
--- a/Sources/KSCrashReportingCore/KSHTTPMultipartPostBody.m
+++ b/Sources/KSCrashReportingCore/KSHTTPMultipartPostBody.m
@@ -48,16 +48,16 @@ static void appendUTF8Format(NSMutableData *data, NSString *format, ...)
 @interface KSHTTPPostField : NSObject
 
 /** This field's binary encoded contents. */
-@property(nonatomic, readonly, retain) NSData *data;
+@property(nonatomic, readonly, copy) NSData *data;
 
 /** This field's name. */
-@property(nonatomic, readonly, retain) NSString *name;
+@property(nonatomic, readonly, copy) NSString *name;
 
 /** This field's content-type. */
-@property(nonatomic, readonly, retain) NSString *contentType;
+@property(nonatomic, readonly, copy) NSString *contentType;
 
 /** This field's filename. */
-@property(nonatomic, readonly, retain) NSString *filename;
+@property(nonatomic, readonly, copy) NSString *filename;
 
 + (KSHTTPPostField *)data:(NSData *)data
                      name:(NSString *)name
@@ -73,11 +73,6 @@ - (id)initWithData:(NSData *)data
 
 @implementation KSHTTPPostField
 
-@synthesize data = _data;
-@synthesize name = _name;
-@synthesize contentType = _contentType;
-@synthesize filename = _filename;
-
 + (KSHTTPPostField *)data:(NSData *)data
                      name:(NSString *)name
               contentType:(NSString *)contentType
@@ -95,10 +90,10 @@ - (id)initWithData:(NSData *)data
     NSParameterAssert(name);
 
     if ((self = [super init])) {
-        _data = data;
-        _name = name;
-        _contentType = contentType;
-        _filename = filename;
+        _data = [data copy];
+        _name = [name copy];
+        _contentType = [contentType copy];
+        _filename = [filename copy];
     }
     return self;
 }
@@ -107,17 +102,13 @@ - (id)initWithData:(NSData *)data
 
 @interface KSHTTPMultipartPostBody ()
 
-@property(nonatomic, readwrite, retain) NSMutableArray *fields;
-@property(nonatomic, readwrite, retain) NSString *boundary;
+@property(nonatomic, readwrite, strong) NSMutableArray *fields;
+@property(nonatomic, readwrite, copy) NSString *boundary;
 
 @end
 
 @implementation KSHTTPMultipartPostBody
 
-@synthesize contentType = _contentType;
-@synthesize fields = _fields;
-@synthesize boundary = _boundary;
-
 + (KSHTTPMultipartPostBody *)body
 {
     return [[self alloc] init];
diff --git a/Sources/KSCrashReportingCore/KSReachabilityKSCrash.m b/Sources/KSCrashReportingCore/KSReachabilityKSCrash.m
index 6f9a12b2..70265688 100644
--- a/Sources/KSCrashReportingCore/KSReachabilityKSCrash.m
+++ b/Sources/KSCrashReportingCore/KSReachabilityKSCrash.m
@@ -35,7 +35,7 @@
 #if KSCRASH_HAS_REACHABILITY
 @interface KSReachabilityKSCrash ()
 
-@property(nonatomic, readwrite, retain) NSString *hostname;
+@property(nonatomic, readwrite, copy) NSString *hostname;
 @property(nonatomic, readwrite, assign) SCNetworkReachabilityFlags flags;
 @property(nonatomic, readwrite, assign) BOOL reachable;
 @property(nonatomic, readwrite, assign) BOOL WWANOnly;
@@ -57,14 +57,6 @@ - (void)onReachabilityFlagsChanged:(SCNetworkReachabilityFlags)flags;
 
 @implementation KSReachabilityKSCrash
 
-@synthesize onReachabilityChanged = _onReachabilityChanged;
-@synthesize flags = _flags;
-@synthesize reachable = _reachable;
-@synthesize WWANOnly = _WWANOnly;
-@synthesize reachabilityRef = _reachabilityRef;
-@synthesize hostname = _hostname;
-@synthesize notificationName = _notificationName;
-
 + (KSReachabilityKSCrash *)reachabilityToHost:(NSString *)hostname
 {
     return [[self alloc] initWithHost:hostname];
@@ -132,7 +124,7 @@ - (id)initWithReachabilityRef:(SCNetworkReachabilityRef)reachabilityRef
             }
         });
 
-        self.reachabilityRef = reachabilityRef;
+        _reachabilityRef = reachabilityRef;
 
         return self;
     }
@@ -141,7 +133,7 @@ - (id)initWithReachabilityRef:(SCNetworkReachabilityRef)reachabilityRef
     if (reachabilityRef) {
         CFRelease(reachabilityRef);
     }
-    self.reachabilityRef = NULL;
+    _reachabilityRef = NULL;
     return nil;
 }
 
@@ -249,14 +241,12 @@ static void onReachabilityChanged(__unused SCNetworkReachabilityRef target, SCNe
 
 @interface KSReachableOperationKSCrash ()
 
-@property(nonatomic, readwrite, retain) KSReachabilityKSCrash *reachability;
+@property(nonatomic, readwrite, strong) KSReachabilityKSCrash *reachability;
 
 @end
 
 @implementation KSReachableOperationKSCrash
 
-@synthesize reachability = _reachability;
-
 + (KSReachableOperationKSCrash *)operationWithHost:(NSString *)host
                                          allowWWAN:(BOOL)allowWWAN
                                              block:(void (^)(void))block
@@ -267,14 +257,14 @@ + (KSReachableOperationKSCrash *)operationWithHost:(NSString *)host
 - (id)initWithHost:(NSString *)host allowWWAN:(BOOL)allowWWAN block:(void (^)(void))block
 {
     if ((self = [super init])) {
-        self.reachability = [KSReachabilityKSCrash reachabilityToHost:host];
+        _reachability = [KSReachabilityKSCrash reachabilityToHost:host];
 
-        __unsafe_unretained KSReachableOperationKSCrash *blockSelf = self;
-        self.reachability.onReachabilityChanged = ^(KSReachabilityKSCrash *reachability) {
+        __weak __typeof(self) weakSelf = self;
+        _reachability.onReachabilityChanged = ^(KSReachabilityKSCrash *reachability) {
             if (reachability.reachable) {
                 if (allowWWAN || !reachability.WWANOnly) {
                     block();
-                    blockSelf.reachability = nil;
+                    weakSelf.reachability = nil;
                 }
             }
         };
@@ -288,12 +278,6 @@ - (id)initWithHost:(NSString *)host allowWWAN:(BOOL)allowWWAN block:(void (^)(vo
 
 @implementation KSReachabilityKSCrash
 
-@synthesize onReachabilityChanged = _onReachabilityChanged;
-@synthesize reachable = _reachable;
-@synthesize WWANOnly = _WWANOnly;
-@synthesize hostname = _hostname;
-@synthesize notificationName = _notificationName;
-
 + (KSReachabilityKSCrash *)reachabilityToHost:(__unused NSString *)hostname
 {
     return [[self alloc] init];
diff --git a/Sources/KSCrashReportingCore/include/KSHTTPMultipartPostBody.h b/Sources/KSCrashReportingCore/include/KSHTTPMultipartPostBody.h
index 991860fd..c89810bd 100644
--- a/Sources/KSCrashReportingCore/include/KSHTTPMultipartPostBody.h
+++ b/Sources/KSCrashReportingCore/include/KSHTTPMultipartPostBody.h
@@ -32,7 +32,7 @@
 @interface KSHTTPMultipartPostBody : NSObject
 
 /** The content-type identifier for this body. */
-@property(nonatomic, readonly, retain) NSString *contentType;
+@property(nonatomic, readonly, copy) NSString *contentType;
 
 /** Constructor.
  *
diff --git a/Sources/KSCrashReportingCore/include/KSReachabilityKSCrash.h b/Sources/KSCrashReportingCore/include/KSReachabilityKSCrash.h
index 4346d04a..42a7490b 100644
--- a/Sources/KSCrashReportingCore/include/KSReachabilityKSCrash.h
+++ b/Sources/KSCrashReportingCore/include/KSReachabilityKSCrash.h
@@ -64,7 +64,7 @@
 #pragma mark General Information
 
 /** The host we are monitoring reachability to, if any. */
-@property(nonatomic, readonly, retain) NSString *hostname;
+@property(nonatomic, readonly, copy) NSString *hostname;
 
 #pragma mark Notifications and Callbacks
 
@@ -76,7 +76,7 @@
 /** The notification to send when reachability changes (nil = don't send).
  * Default = nil
  */
-@property(nonatomic, readwrite, retain) NSString *notificationName;
+@property(nonatomic, readwrite, copy) NSString *notificationName;
 
 #pragma mark KVO Compliant Status Properties
 
diff --git a/Sources/KSCrashSinks/KSCrashReportSinkEMail.m b/Sources/KSCrashSinks/KSCrashReportSinkEMail.m
index edeebb63..1cfa5a7f 100644
--- a/Sources/KSCrashSinks/KSCrashReportSinkEMail.m
+++ b/Sources/KSCrashSinks/KSCrashReportSinkEMail.m
@@ -45,7 +45,7 @@ @interface KSCrashMailProcess : NSObject <MFMailComposeViewControllerDelegate>
 @property(nonatomic, readwrite, copy) NSArray<KSCrashReport *> *reports;
 @property(nonatomic, readwrite, copy) KSCrashReportFilterCompletion onCompletion;
 
-@property(nonatomic, readwrite, retain) UIViewController *dummyVC;
+@property(nonatomic, readwrite, strong) UIViewController *dummyVC;
 
 + (KSCrashMailProcess *)process;
 
@@ -61,10 +61,6 @@ - (void)dismissModalVC;
 
 @implementation KSCrashMailProcess
 
-@synthesize reports = _reports;
-@synthesize onCompletion = _onCompletion;
-@synthesize dummyVC = _dummyVC;
-
 + (KSCrashMailProcess *)process
 {
     return [[self alloc] init];
@@ -164,23 +160,15 @@ - (void)dismissModalVC
 
 @interface KSCrashReportSinkEMail ()
 
-@property(nonatomic, readwrite, retain) NSArray *recipients;
-
-@property(nonatomic, readwrite, retain) NSString *subject;
-
-@property(nonatomic, readwrite, retain) NSString *message;
-
-@property(nonatomic, readwrite, retain) NSString *filenameFmt;
+@property(nonatomic, readwrite, copy) NSArray *recipients;
+@property(nonatomic, readwrite, copy) NSString *subject;
+@property(nonatomic, readwrite, copy) NSString *message;
+@property(nonatomic, readwrite, copy) NSString *filenameFmt;
 
 @end
 
 @implementation KSCrashReportSinkEMail
 
-@synthesize recipients = _recipients;
-@synthesize subject = _subject;
-@synthesize message = _message;
-@synthesize filenameFmt = _filenameFmt;
-
 + (instancetype)sinkWithRecipients:(NSArray<NSString *> *)recipients
                            subject:(NSString *)subject
                            message:(nullable NSString *)message
@@ -195,10 +183,10 @@ - (instancetype)initWithRecipients:(NSArray<NSString *> *)recipients
                        filenameFmt:(NSString *)filenameFmt
 {
     if ((self = [super init])) {
-        self.recipients = recipients;
-        self.subject = subject;
-        self.message = message;
-        self.filenameFmt = filenameFmt;
+        _recipients = [recipients copy];
+        _subject = [subject copy];
+        _message = [message copy];
+        _filenameFmt = [filenameFmt copy];
     }
     return self;
 }
diff --git a/Sources/KSCrashSinks/KSCrashReportSinkStandard.m b/Sources/KSCrashSinks/KSCrashReportSinkStandard.m
index 1c613528..f8f9b266 100644
--- a/Sources/KSCrashSinks/KSCrashReportSinkStandard.m
+++ b/Sources/KSCrashSinks/KSCrashReportSinkStandard.m
@@ -38,17 +38,14 @@
 
 @interface KSCrashReportSinkStandard ()
 
-@property(nonatomic, readwrite, retain) NSURL *url;
+@property(nonatomic, readwrite, strong) NSURL *url;
 
-@property(nonatomic, readwrite, retain) KSReachableOperationKSCrash *reachableOperation;
+@property(nonatomic, readwrite, strong) KSReachableOperationKSCrash *reachableOperation;
 
 @end
 
 @implementation KSCrashReportSinkStandard
 
-@synthesize url = _url;
-@synthesize reachableOperation = _reachableOperation;
-
 + (instancetype)sinkWithURL:(NSURL *)url
 {
     return [[self alloc] initWithURL:url];
@@ -57,7 +54,7 @@ + (instancetype)sinkWithURL:(NSURL *)url
 - (instancetype)initWithURL:(NSURL *)url
 {
     if ((self = [super init])) {
-        self.url = url;
+        _url = url;
     }
     return self;
 }
diff --git a/Sources/KSCrashTestTools/FileBasedTestCase.m b/Sources/KSCrashTestTools/FileBasedTestCase.m
index da23942b..d08605ec 100644
--- a/Sources/KSCrashTestTools/FileBasedTestCase.m
+++ b/Sources/KSCrashTestTools/FileBasedTestCase.m
@@ -29,8 +29,6 @@
 
 @implementation FileBasedTestCase
 
-@synthesize tempPath = _tempPath;
-
 - (void)setUp
 {
     [super setUp];
diff --git a/Sources/KSCrashTestTools/TestThread.m b/Sources/KSCrashTestTools/TestThread.m
index 5764296c..fb4c0f56 100644
--- a/Sources/KSCrashTestTools/TestThread.m
+++ b/Sources/KSCrashTestTools/TestThread.m
@@ -29,8 +29,6 @@
 
 @implementation TestThread
 
-@synthesize thread = _thread;
-
 - (void)main
 {
     self.thread = (thread_t)ksthread_self();
diff --git a/Sources/KSCrashTestTools/include/FileBasedTestCase.h b/Sources/KSCrashTestTools/include/FileBasedTestCase.h
index 5a2a4fa9..73b4a858 100644
--- a/Sources/KSCrashTestTools/include/FileBasedTestCase.h
+++ b/Sources/KSCrashTestTools/include/FileBasedTestCase.h
@@ -28,7 +28,7 @@
 
 @interface FileBasedTestCase : XCTestCase
 
-@property(nonatomic, readwrite, retain) NSString *tempPath;
+@property(nonatomic, readwrite, copy) NSString *tempPath;
 
 - (NSString *)generateTempFilePath;
 - (NSString *)generateFileWithData:(NSData *)data;
diff --git a/Tests/KSCrashFiltersTests/KSCrashReportFilter_Tests.m b/Tests/KSCrashFiltersTests/KSCrashReportFilter_Tests.m
index 7718510c..0c753e86 100644
--- a/Tests/KSCrashFiltersTests/KSCrashReportFilter_Tests.m
+++ b/Tests/KSCrashFiltersTests/KSCrashReportFilter_Tests.m
@@ -54,22 +54,15 @@ @interface KSCrash_TestFilter : NSObject <KSCrashReportFilter>
 
 @property(nonatomic, readwrite, assign) NSTimeInterval delay;
 @property(nonatomic, readwrite, assign) BOOL completed;
-@property(nonatomic, readwrite, retain) NSError *error;
-@property(nonatomic, readwrite, retain) NSTimer *timer;
-@property(nonatomic, readwrite, retain) NSArray<KSCrashReport *> *reports;
+@property(nonatomic, readwrite, strong) NSError *error;
+@property(nonatomic, readwrite, strong) NSTimer *timer;
+@property(nonatomic, readwrite, copy) NSArray<KSCrashReport *> *reports;
 @property(nonatomic, readwrite, copy) KSCrashReportFilterCompletion onCompletion;
 
 @end
 
 @implementation KSCrash_TestFilter
 
-@synthesize delay = _delay;
-@synthesize completed = _completed;
-@synthesize error = _error;
-@synthesize reports = _reports;
-@synthesize timer = _timer;
-@synthesize onCompletion = _onCompletion;
-
 + (KSCrash_TestFilter *)filterWithDelay:(NSTimeInterval)delay completed:(BOOL)completed error:(NSError *)error
 {
     return [[self alloc] initWithDelay:delay completed:completed error:error];
@@ -78,9 +71,9 @@ + (KSCrash_TestFilter *)filterWithDelay:(NSTimeInterval)delay completed:(BOOL)co
 - (id)initWithDelay:(NSTimeInterval)delay completed:(BOOL)completed error:(NSError *)error
 {
     if ((self = [super init])) {
-        self.delay = delay;
-        self.completed = completed;
-        self.error = error;
+        _delay = delay;
+        _completed = completed;
+        _error = error;
     }
     return self;
 }
diff --git a/Tests/KSCrashRecordingCoreTests/KSLogger_Tests.m b/Tests/KSCrashRecordingCoreTests/KSLogger_Tests.m
index 16ed827c..7183f909 100644
--- a/Tests/KSCrashRecordingCoreTests/KSLogger_Tests.m
+++ b/Tests/KSCrashRecordingCoreTests/KSLogger_Tests.m
@@ -31,14 +31,12 @@
 
 @interface KSLogger_Tests : XCTestCase
 
-@property(nonatomic, readwrite, retain) NSString *tempDir;
+@property(nonatomic, readwrite, copy) NSString *tempDir;
 
 @end
 
 @implementation KSLogger_Tests
 
-@synthesize tempDir = _tempDir;
-
 - (void)setUp
 {
     [super setUp];
diff --git a/Tests/KSCrashRecordingTests/KSCrashReportStore_Tests.m b/Tests/KSCrashRecordingTests/KSCrashReportStore_Tests.m
index 44831e1c..90aa6215 100644
--- a/Tests/KSCrashRecordingTests/KSCrashReportStore_Tests.m
+++ b/Tests/KSCrashRecordingTests/KSCrashReportStore_Tests.m
@@ -34,18 +34,14 @@
 
 @interface KSCrashReportStore_Tests : FileBasedTestCase
 
-@property(nonatomic, readwrite, retain) NSString *appName;
-@property(nonatomic, readwrite, retain) NSString *reportStorePath;
+@property(nonatomic, readwrite, copy) NSString *appName;
+@property(nonatomic, readwrite, copy) NSString *reportStorePath;
 @property(atomic, readwrite, assign) int64_t reportCounter;
 
 @end
 
 @implementation KSCrashReportStore_Tests
 
-@synthesize appName = _appName;
-@synthesize reportStorePath = _reportStorePath;
-@synthesize reportCounter = _reportCounter;
-
 - (int64_t)getReportIDFromPath:(NSString *)path
 {
     const char *filename = path.lastPathComponent.UTF8String;