diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 0ab9105b..a14c1f7a 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,7 +27,7 @@ jobs:
           sharedKey: ${{ matrix.os }}
       - name: Cache dependencies
         if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov ; fi
+        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
       - name: Format
         run: |
           make format
@@ -96,7 +96,7 @@ jobs:
         with:
           sharedKey: ubuntu-latest
       - name: Install grcov
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
+        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install --locked grcov; fi
       - name: Run tests
         run: |
           make test_matrix