diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 69a8517b748..97edbf9ba86 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -179,11 +179,11 @@ jobs:
 
       - name: Core System Tests
         if: matrix.build_type == 'system' && matrix.target == 'core'
-        run: PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --verbose spec/system
+        run: PARALLEL_TEST_PROCESSORS=1 bin/turbo_rspec --verbose spec/system
 
       - name: Plugin System Tests
         if: matrix.build_type == 'system' && matrix.target == 'plugins'
-        run: LOAD_PLUGINS=1 PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --verbose plugins/*/spec/system
+        run: LOAD_PLUGINS=1 PARALLEL_TEST_PROCESSORS=1 bin/turbo_rspec --verbose plugins/*/spec/system
 
       - name: Upload failed system test screenshots
         uses: actions/upload-artifact@v3