diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index af1a91f34..029352f47 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -95,7 +95,7 @@ jobs:
           key: conda-${{ runner.os }}-${{ env.PYTHON }}-${{ hashFiles('requirements-full.txt') }}
 
       - name: Install requirements
-        run: mamba install --file requirements-full.txt python=$PYTHON
+        run: mamba install -c conda-forge --file requirements-full.txt python=$PYTHON
 
       - name: List installed packages
         run: mamba list