diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3597a80..7243f10 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -53,7 +53,7 @@ jobs:
         run: cargo +nightly doc -p agent-client-protocol --all-features --no-deps
 
       - name: Install just
-        uses: taiki-e/install-action@d9be7d8cda89035c9c843f78bd44d4f72d8403d4
+        uses: taiki-e/install-action@6887963ccf37a9ddcd8c5fa4baeb3e1e5fd61fa1
         with:
           tool: just
 
@@ -96,7 +96,7 @@ jobs:
           toolchain: stable
 
       - name: Install cargo-hack
-        uses: taiki-e/install-action@d9be7d8cda89035c9c843f78bd44d4f72d8403d4
+        uses: taiki-e/install-action@6887963ccf37a9ddcd8c5fa4baeb3e1e5fd61fa1
         with:
           tool: cargo-hack
 
diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index 3a3e8da..117d415 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -34,7 +34,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
 
       - name: Install mdBook
-        uses: taiki-e/install-action@d9be7d8cda89035c9c843f78bd44d4f72d8403d4
+        uses: taiki-e/install-action@6887963ccf37a9ddcd8c5fa4baeb3e1e5fd61fa1
         with:
           tool: mdbook,mdbook-mermaid