diff --git a/.github/workflows/test-contracts.yml b/.github/workflows/test-contracts.yml
index aac6ee9e..04693526 100644
--- a/.github/workflows/test-contracts.yml
+++ b/.github/workflows/test-contracts.yml
@@ -35,7 +35,7 @@ jobs:
           architecture: ${{ matrix.architecture }}
 
       - name: Install Vyper
-        run: pip install vyper
+        run: pip install git+https://github.com/vyperlang/vyper@master
 
       - name: Show the Vyper version
         run: vyper --version