diff --git a/.github/workflows/testsuite.yml b/.github/workflows/testsuite.yml
index 77d876cfa..abcfc2220 100644
--- a/.github/workflows/testsuite.yml
+++ b/.github/workflows/testsuite.yml
@@ -81,7 +81,7 @@ jobs:
       - name: Determine Cython cache dir
         id: cython-cache
         run: |
-          CACHE_DIR=$(python -c 'import os; from Cython.Utils import get_cython_cache_dir; print(os.path.join(get_cython_cache_dir(), "brian_extensions"))')
+          CACHE_DIR=$(python -c 'from brian2.codegen.runtime.cython_rt.extension_manager import get_cython_cache_dir; print(get_cython_cache_dir())')
           echo "Cython cache dir: $CACHE_DIR"
           echo "cachedir=$CACHE_DIR" >> "$GITHUB_OUTPUT"