diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index d2b600e0..61524b77 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -36,7 +36,7 @@ jobs:
         run: |
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/environment.yml
           environment-name: cf_xarray_test
@@ -70,7 +70,7 @@ jobs:
           # need to fetch all tags to get a correct version
           fetch-depth: 0  # fetch all branches and tags
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/environment-no-optional-deps.yml
           environment-name: cf_xarray_test
@@ -97,7 +97,7 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/environment.yml
           environment-name: cf_xarray_test
diff --git a/.github/workflows/upstream-dev-ci.yaml b/.github/workflows/upstream-dev-ci.yaml
index f9116cfa..c5efd597 100644
--- a/.github/workflows/upstream-dev-ci.yaml
+++ b/.github/workflows/upstream-dev-ci.yaml
@@ -38,7 +38,7 @@ jobs:
         run: |
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/upstream-dev-env.yml
           environment-name: cf_xarray_test