diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b7b4c5d..21287b2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pipenv
+          pip install pipenv==2018.11.26
           pipenv sync --dev --system
       - name: Linting
         run: make check