diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 90d03ca..3d4af6b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,10 +47,12 @@ jobs:
           which python
           python -V
           pip install .[dev]
+        shell: micromamba-shell {0}
       - name: Test with pytest
         run: |
           coverage run --source=. --omit=".tox/*" --branch -m pytest .
           coverage report
+        shell: micromamba-shell {0}
 
   tests_eager:
     runs-on: ubuntu-latest
@@ -80,8 +82,10 @@ jobs:
           which python
           python -V
           pip install .[dev]
+        shell: micromamba-shell {0}
       - name: Test with pytest
         run: |
           ZFIT_DO_JIT=0
           coverage run --source=. --omit=".tox/*,*/test*," --branch -m pytest .
           coverage report
+        shell: micromamba-shell {0}