diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eba81f1f4..8671c9045 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -140,7 +140,7 @@ jobs:
           components: rustfmt, clippy
 
       - name: Install Rust test and advisory tools
-        uses: taiki-e/install-action@v2
+        uses: taiki-e/install-action@v2.85.5
         with:
           # Prebuilt binaries instead of compiling from source on every cache miss.
           # cargo-public-api is snapshot-sensitive; keep this in sync with
diff --git a/.github/workflows/runtime-quality.yml b/.github/workflows/runtime-quality.yml
index 11bcbb340..ed5f798bc 100644
--- a/.github/workflows/runtime-quality.yml
+++ b/.github/workflows/runtime-quality.yml
@@ -43,7 +43,7 @@ jobs:
         run: rustup show
 
       - name: Install cargo-deny
-        uses: taiki-e/install-action@v2
+        uses: taiki-e/install-action@v2.85.5
         with:
           tool: cargo-deny