diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7f1ae1355939637bcc3ae36bc750e710b75e1dda..852614731e0a2255879218df1a5c2a4510545877 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -51,7 +51,7 @@ code_style:
   tags: [ docker ]
   stage: test
   script:
-    - clang-format-11 --dry-run --verbose **/*.cpp **/*.h **/*.h.in
+    - clang-format-11 --dry-run --verbose --Werror $(find test/ src/ include/ -type f -iname "*.cpp" -o -iname "*.h" -o -iname "*.h.in")
   allow_failure: true
 
 # unit tests with gtest
diff --git a/DEPENDENCIES.md b/DEPENDENCIES.md
index e09a81373d0f20715de0daa316a3688c71bc1ad2..360292a3b5a51cad63e8a5526bff2db81af65a26 100644
--- a/DEPENDENCIES.md
+++ b/DEPENDENCIES.md
@@ -13,6 +13,7 @@
 # BUILD AND RUN TESTS
 
 * >=clang-tidy-11
+* >=gtest-1.10.0
 
 # COVERAGE