diff --git a/.github/scripts-windows/run-tests-csharp.cmd b/.github/scripts-windows/run-tests-csharp.cmd
index b97ed18d39..c5e1fb0a77 100644
--- a/.github/scripts-windows/run-tests-csharp.cmd
+++ b/.github/scripts-windows/run-tests-csharp.cmd
@@ -1,5 +1,5 @@
 dotnet build runtime/CSharp/src/Antlr4.csproj -c Release
 dotnet pack runtime/CSharp/src/Antlr4.csproj -c Release
 cd runtime-testsuite
-mvn -Dtest=csharp.** test
+mvn -Dparallel=classes -DthreadCount=2 -Dtest=csharp.** test
 cd ..
diff --git a/.github/scripts-windows/run-tests-go.cmd b/.github/scripts-windows/run-tests-go.cmd
index f4d214f266..1c15fd1c95 100644
--- a/.github/scripts-windows/run-tests-go.cmd
+++ b/.github/scripts-windows/run-tests-go.cmd
@@ -1,3 +1,3 @@
 cd runtime-testsuite
-mvn -Dtest=go.** test
+mvn -Dparallel=classes -DthreadCount=2 -Dtest=go.** test
 cd ..
diff --git a/.github/scripts-windows/run-tests-java.cmd b/.github/scripts-windows/run-tests-java.cmd
index 45cdbdfdf9..55e9ea5621 100755
--- a/.github/scripts-windows/run-tests-java.cmd
+++ b/.github/scripts-windows/run-tests-java.cmd
@@ -1,3 +1,3 @@
 cd runtime-testsuite
-mvn -Dtest=java.** test
+mvn -Dparallel=classes -DthreadCount=2 -Dtest=java.** test
 cd ..
diff --git a/.github/scripts-windows/run-tests-javascript.cmd b/.github/scripts-windows/run-tests-javascript.cmd
index 4b6deb109a..b8744e8980 100644
--- a/.github/scripts-windows/run-tests-javascript.cmd
+++ b/.github/scripts-windows/run-tests-javascript.cmd
@@ -1,3 +1,3 @@
 cd runtime-testsuite
-mvn -Dtest=javascript.** test 
+mvn -Dparallel=classes -DthreadCount=2 -Dtest=javascript.** test
 cd ..
diff --git a/.github/scripts-windows/run-tests-php.cmd b/.github/scripts-windows/run-tests-php.cmd
index c6b3fed43e..155cc0472f 100644
--- a/.github/scripts-windows/run-tests-php.cmd
+++ b/.github/scripts-windows/run-tests-php.cmd
@@ -4,5 +4,5 @@ git clone https://github.com/antlr/antlr-php-runtime.git
 move antlr-php-runtime runtime\PHP
 
 cd runtime-testsuite
-mvn -Dtest=php.** test -Dantlr-php-php="C:\tools\php81\php.exe"
+mvn -Dparallel=classes -DthreadCount=2 -Dtest=php.** test -Dantlr-php-php="C:\tools\php81\php.exe"
 cd ..
diff --git a/.github/scripts-windows/run-tests-python2.cmd b/.github/scripts-windows/run-tests-python2.cmd
index 85ec00be36..351355b03a 100644
--- a/.github/scripts-windows/run-tests-python2.cmd
+++ b/.github/scripts-windows/run-tests-python2.cmd
@@ -1,3 +1,3 @@
 cd runtime-testsuite
-mvn -Dantlr-python2-python="C:\Python27\python.exe" -Dtest=python2.** test 
+mvn -Dparallel=classes -DthreadCount=2 -Dantlr-python2-python="C:\Python27\python.exe" -Dtest=python2.** test
 cd ..
diff --git a/.github/scripts-windows/run-tests-python3.cmd b/.github/scripts-windows/run-tests-python3.cmd
index 9dda1ea1cd..fe448be018 100644
--- a/.github/scripts-windows/run-tests-python3.cmd
+++ b/.github/scripts-windows/run-tests-python3.cmd
@@ -1,3 +1,3 @@
 cd runtime-testsuite
-mvn -Dantlr-python3-python="C:\Python310\python.exe" -Dtest=python3.** test 
+mvn -Dparallel=classes -DthreadCount=2 -Dantlr-python3-python="C:\Python310\python.exe" -Dtest=python3.** test
 cd ..