diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cd92fad5..6a24545f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -105,7 +105,7 @@ jobs:
       - name: Install momi engine (Linux).
         if: runner.os == 'Linux'
         run: |
-          python3 -m pip install wheel=0.38.4
+          python3 -m pip install wheel==0.38.4
           python3 -m pip install momi
 
       - name: Check installations of packages.