diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index f1341778..92a9355b 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -29,7 +29,10 @@ jobs:
 
       - uses: actions-rs/toolchain@v1.0.7
         with:
-          toolchain: nightly
+          # Pinned to workaround issue making cargo-llvm-cov fail, see
+          # https://github.com/taiki-e/cargo-llvm-cov/issues/128
+          # TODO: restore to just `nightly` after it's fixed
+          toolchain: nightly-2022-01-14
           override: true
           profile: minimal
           components: llvm-tools-preview