diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f7316e0..71b58aa 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -142,7 +142,7 @@ jobs:
           pip install -U setuptools wheel twine
           # cffi will probably have no public release until a beta or even RC
           # version of Python 3.13.
-          pip install -U cffi @ https://github.com/python-cffi/cffi/archive/refs/heads/main.zip
+          pip install -U "cffi @ https://github.com/python-cffi/cffi/archive/refs/heads/main.zip"
 
       - name: Install Build Dependencies
         if: matrix.python-version != '3.13.0-alpha - 3.13.0'