diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a54462fd..78f44125 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,8 +23,11 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v1.9.0
         with:
+          # https://github.com/mamba-org/setup-micromamba/issues/227
+          micromamba-version: 1.5.10-0
+          micromamba-binary-path: /home/runner/micromamba-bin-versioned/micromamba
           environment-file: ${{ matrix.env }}
           cache-environment: true
           cache-downloads: true