diff --git a/.github/workflows/premerge.yaml b/.github/workflows/premerge.yaml
index fae4a10..03c2e13 100644
--- a/.github/workflows/premerge.yaml
+++ b/.github/workflows/premerge.yaml
@@ -15,12 +15,15 @@ jobs:
   tests:
     name: Python tests
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12']
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.12
+          python-version: ${{ matrix.python-version }}
       - name: Run tests
         run: |
-          python -m unittest tests/rawdata.py
+          python -m unittest tests/*.py
diff --git a/README.md b/README.md
index 0fcfbb7..460f646 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Please follow the instructions provided over at https://github.com/xNul/palworld
 
 ### Prerequisites
 
-1. Python. This can be installed from the Windows Store.
+1. Python 3.9 or newer. You can install [Python 3.12 from the Microsoft Store](https://apps.microsoft.com/detail/9NCVDN91XZQP)
 
 ### Windows steps
 
diff --git a/convenience_tools/convert-single-json-to-sav.cmd b/convenience_tools/convert-single-json-to-sav.cmd
index 83f1db3..2940c30 100644
--- a/convenience_tools/convert-single-json-to-sav.cmd
+++ b/convenience_tools/convert-single-json-to-sav.cmd
@@ -16,28 +16,38 @@ pause
 exit /B 1
 
 :Found
-@REM Print Python version for debugging
+:: Print Python version for debugging
 ECHO Python version:
 %PYTHON_BIN% --version
 
-@REM Switch to script directory
+:: Check that the minor version of python is at least 9.
+FOR /F "tokens=1,2 delims=." %%G IN ('%PYTHON_BIN% --version') DO (
+   SET PYTHON_VERSION_MINOR=%%H
+)
+
+IF %PYTHON_VERSION_MINOR% LSS 9 (
+  ECHO Python 3.9 or higher is required.
+  EXIT /B 1
+)
+
+:: Switch to script directory
 cd /D "%~dp0"
 
-@REM Check if convert-single-json-to-sav.py exists
+:: Check if convert-single-json-to-sav.py exists
 IF NOT EXIST "convert-single-json-to-sav.py" (
     ECHO convert-single-json-to-sav.py is missing.
     PAUSE
     EXIT /B 1
 )
 
-@REM Check if first argument exists
+:: Check if first argument exists
 IF NOT EXIST "%~1" (
     ECHO You must specify a .sav file to convert.
     PAUSE
     EXIT /B 1
 )
 
-@REM Check if uesave.exe exists
+:: Check if uesave.exe exists
 IF NOT EXIST "uesave/uesave.exe" (
     ECHO uesave.exe is missing. Did you download the palworld-save-tools.zip from releases?
     MKDIR uesave
@@ -48,7 +58,7 @@ IF NOT EXIST "uesave/uesave.exe" (
 ECHO This will convert the save file "%~1" in JSON format in back to .sav format.
 ECHO This will overwrite your existing .sav file!
 ECHO Please make a backup of your .sav file before continuing!
-@REM Ask user if they want to continue
+:: Ask user if they want to continue
 CHOICE /C YN /M "Continue?"
 IF %ERRORLEVEL% NEQ 1 (
     ECHO Exiting because aborted.
diff --git a/convenience_tools/convert-single-sav-to-json.cmd b/convenience_tools/convert-single-sav-to-json.cmd
index 3e2ec98..490eb2c 100644
--- a/convenience_tools/convert-single-sav-to-json.cmd
+++ b/convenience_tools/convert-single-sav-to-json.cmd
@@ -16,28 +16,38 @@ pause
 exit /B 1
 
 :Found
-@REM Print Python version for debugging
+:: Print Python version for debugging
 ECHO Python version:
 %PYTHON_BIN% --version
 
-@REM Switch to script directory
+:: Check that the minor version of python is at least 9.
+FOR /F "tokens=1,2 delims=." %%G IN ('%PYTHON_BIN% --version') DO (
+   SET PYTHON_VERSION_MINOR=%%H
+)
+
+IF %PYTHON_VERSION_MINOR% LSS 9 (
+  ECHO Python 3.9 or higher is required.
+  EXIT /B 1
+)
+
+:: Switch to script directory
 cd /D "%~dp0"
 
-@REM Check if convert-single-sav-to-json.py exists
+:: Check if convert-single-sav-to-json.py exists
 IF NOT EXIST "convert-single-sav-to-json.py" (
     ECHO convert-single-sav-to-json.py is missing.
     PAUSE
     EXIT /B 1
 )
 
-@REM Check if first argument exists
+:: Check if first argument exists
 IF NOT EXIST "%~1" (
     ECHO You must specify a .sav file to convert.
     PAUSE
     EXIT /B 1
 )
 
-@REM Check if uesave.exe exists
+:: Check if uesave.exe exists
 IF NOT EXIST "uesave/uesave.exe" (
     ECHO uesave.exe is missing. Did you download the palworld-save-tools.zip from releases?
     MKDIR uesave
@@ -46,7 +56,6 @@ IF NOT EXIST "uesave/uesave.exe" (
 )
 
 ECHO This will convert the save file "%~1" to JSON format.
-@REM Ask user if they want to continue
 CHOICE /C YN /M "Continue?"
 IF %ERRORLEVEL% NEQ 1 (
     ECHO Exiting because aborted.