diff --git a/.github/workflows/nestbuildmatrix.yml b/.github/workflows/nestbuildmatrix.yml
index 6ec8a79f0f..b35f6a5828 100644
--- a/.github/workflows/nestbuildmatrix.yml
+++ b/.github/workflows/nestbuildmatrix.yml
@@ -445,6 +445,7 @@ jobs:
         uses: psf/black@af0ba72a73598c76189d6dd1b21d8532255d5942  # 25.9.0
         with:
           jupyter: true
+          src: testsuite doc build_support examples pynest
 
   flake8:
     runs-on: "ubuntu-22.04"