diff --git a/.github/workflows/nightly-release.yml b/.github/workflows/nightly-release.yml
index e2bb2d4c..38568202 100644
--- a/.github/workflows/nightly-release.yml
+++ b/.github/workflows/nightly-release.yml
@@ -78,7 +78,7 @@ jobs:
         run: rustup toolchain install nightly-2026-03-30 --component llvm-tools --no-self-update
 
       - name: Install cargo-llvm-cov
-        uses: taiki-e/install-action@25435dc8dd3baed7417e0c96d3fe89013a5b2e09  # v2.81.3
+        uses: taiki-e/install-action@0631aa6515c7d545823c67cfae7ef4fc7f490154  # v2.81.8
         with:
           tool: cargo-llvm-cov
 
diff --git a/.github/workflows/pr-backend-tests.yml b/.github/workflows/pr-backend-tests.yml
index 260f7cfb..ea66d0a2 100644
--- a/.github/workflows/pr-backend-tests.yml
+++ b/.github/workflows/pr-backend-tests.yml
@@ -23,7 +23,7 @@ jobs:
         run: rustup toolchain install nightly-2026-03-30 --component llvm-tools --no-self-update
 
       - name: Install cargo-llvm-cov
-        uses: taiki-e/install-action@25435dc8dd3baed7417e0c96d3fe89013a5b2e09  # v2.81.3
+        uses: taiki-e/install-action@0631aa6515c7d545823c67cfae7ef4fc7f490154  # v2.81.8
         with:
           tool: cargo-llvm-cov
 
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 77560e2a..215b60b3 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -76,7 +76,7 @@ jobs:
         run: rustup toolchain install nightly-2026-03-30 --component llvm-tools --no-self-update
 
       - name: Install cargo-llvm-cov
-        uses: taiki-e/install-action@25435dc8dd3baed7417e0c96d3fe89013a5b2e09  # v2.81.3
+        uses: taiki-e/install-action@0631aa6515c7d545823c67cfae7ef4fc7f490154  # v2.81.8
         with:
           tool: cargo-llvm-cov