diff --git a/.github/workflows/containers.yml b/.github/workflows/containers.yml
index 877b4c37b..557ee888d 100644
--- a/.github/workflows/containers.yml
+++ b/.github/workflows/containers.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Run Celix tests using container image
         run: |
           cd $GITHUB_WORKSPACE/container/
-          ./run-ubuntu-container.sh "cd build && ctest --output-on-failure -j 4"
+          ./run-ubuntu-container.sh "cd build && ctest --output-on-failure -j 2"
 
   container-build-gitpod:
     runs-on: ubuntu-22.04
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 17ac1a7ba..e7902db75 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -105,4 +105,4 @@ jobs:
         run: |
           cd $GITHUB_WORKSPACE/build
           export DYLD_LIBRARY_PATH=$(brew --prefix openssl@1.1)/lib/:$DYLD_LIBRARY_PATH:$(pwd)/utils:$(pwd)/framework:$(pwd)/dfi
-          ctest --output-on-failure -j 4
+          ctest --output-on-failure -j 2
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 2a4d8d600..0e29272bc 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -154,4 +154,4 @@ jobs:
       run: |
         cd $GITHUB_WORKSPACE/build
         export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH:$(pwd)/utils:$(pwd)/framework:$(pwd)/dfi
-        ctest --output-on-failure -j 4
+        ctest --output-on-failure -j 2