diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 688b1d452..a83d96070 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,13 +26,14 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Setup conda
-      uses: conda-incubator/setup-miniconda@v2
+      uses: mamba-org/setup-micromamba@v1
       with:
         environment-file: environment-dev.yml
-        activate-environment: ipyleaflet-dev
-        mamba-version: "*"
-        python-version: ${{ matrix.python-version }}
-        channels: conda-forge
+        condarc: |
+          channels:
+            conda-forge
+          dependencies:
+            - python==${{ matrix.python-version }}
 
     - name: Install ipyleaflet
       run: pip install . --no-deps