diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bd451dcf70..72c8d6068c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,8 +8,10 @@ variables:
   CCACHE_DIR: "/ccache"
 
   GIT_DEPTH: 1
+
+  # The following values may be overwritten in GitLab's CI/CD Variables Settings.
   BUILD_PARALLEL_JOBS: 6
-  TEST_PARALLEL_JOBS: 6
+  TEST_PARALLEL_JOBS: 4
 
   CONFIGURE: ./configure
   CLANG_VERSION: 15