diff --git a/.github/workflows/prototyping.yml b/.github/workflows/prototyping.yml
index 43b6ec6c..2dac3a00 100644
--- a/.github/workflows/prototyping.yml
+++ b/.github/workflows/prototyping.yml
@@ -19,7 +19,7 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ~/.cabal/store
-        key: prototyping-${{ runner.os }}-${{ matrix.agda }}-${{ matrix.hackage }}
+        key: "prototyping-${{ runner.os }}-${{ matrix.agda }}-${{ matrix.hackage }}"
     - uses: actions/cache@v2
       id: luau-ast-cache
       with:
@@ -29,7 +29,7 @@ jobs:
       run: sudo apt-get install -y cabal-install
     - name: cabal update
       working-directory: prototyping
-      run: cabal v2-update hackage.haskell.org,${{ matrix.hackage }}
+      run: cabal v2-update "hackage.haskell.org,${{ matrix.hackage }}"
     - name: cabal install
       working-directory: prototyping
       run: |