diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 178a72e..fb1c815 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: mamba-org/setup-micromamba@v1
         with:
-          micromamba-version: '1.4.5-0'
+          micromamba-version: '1.5.8-0'
           environment-name: test-env
           condarc: |
             channels:
@@ -50,7 +50,6 @@ jobs:
       - name: Test
         shell: bash -el {0}
         run: |
-          micromamba deactivate
           micromamba activate test-env
           python -m pip install .
           PYTHONPATH="." python -m unittest discover -s tests -t .