diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 6885336..4bfd449 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -44,7 +44,7 @@ jobs:
     - name: Build
       run: |
         conda create --yes -n test python=${{ matrix.python-version }} gcc_linux-64
-        source activate test
+        conda activate test
         conda install --yes numpy nose cython mpi4py openmpi
         python setup.py install
     - name: Unit tests