diff --git a/.github/workflows/build-gcpy-environment.yml b/.github/workflows/build-gcpy-environment.yml
index 838924d5..5806a804 100644
--- a/.github/workflows/build-gcpy-environment.yml
+++ b/.github/workflows/build-gcpy-environment.yml
@@ -19,6 +19,8 @@ jobs:
       matrix:
         python-version: ["3.9"]
     steps:
+      - name: Checkout repository content
+        uses: actions/checkout@v2
       - uses: mamba-org/setup-micromamba@v1.8.0
         with:
           micromamba-version: 'latest'