diff --git a/pom.xml b/pom.xml
index 2765f0c..d6d2497 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,10 +1,9 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>hk.ust.bioinformatics</groupId>
     <artifactId>ECL2</artifactId>
-    <version>2.1.5</version>
+    <version>2.1.6</version>
     <packaging>jar</packaging>
 
     <name>ECL2</name>
diff --git a/src/main/java/proteomics/ECL2.java b/src/main/java/proteomics/ECL2.java
index c0a22d7..9b1ce1a 100644
--- a/src/main/java/proteomics/ECL2.java
+++ b/src/main/java/proteomics/ECL2.java
@@ -29,7 +29,7 @@ public class ECL2 {
     public static final int[] isotopeCorrectionArray = new int[]{-2, -1, 0}; // do not change it
 
     private static final Logger logger = LoggerFactory.getLogger(ECL2.class);
-    public static final String version = "2.1.5";
+    public static final String version = "2.1.6";
 
     public static boolean debug;
     public static boolean dev;
diff --git a/src/main/resources/parameter.def b/src/main/resources/parameter.def
index 2a2471f..82e4150 100644
--- a/src/main/resources/parameter.def
+++ b/src/main/resources/parameter.def
@@ -1,4 +1,4 @@
-# 2.1.5
+# 2.1.6
 # The first line is the parameter file version. Do not change it.
 thread_num = 0 # The thread number. Set to 0 to use all the CPU resources of the computer.
 debug = 0 # For debug.