diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 5585897c..c630a8f5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -70,13 +70,14 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: micromamba environment and package installation (Python ${{ matrix.python-version }})
-      uses: mamba-org/setup-micromamba@v1.4.4
+      uses: mamba-org/setup-micromamba@v1
       with:
         environment-file: ci/conda-envs/test_env.yaml
         condarc: |
            channels:
               - conda-forge
               - bioconda
+           channel_priority: strict
         cache-downloads: true
         cache-environment: true
         create-args: >-