diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6fbf1d5..a78ae03 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -32,7 +32,7 @@ jobs:
           submodules: recursive
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@908c540300062bd5a7e473851cdb4282204cee09 # v1.9.1
         with:
           version: ${{ env.FOUNDRY_VERSION }}
 
@@ -56,7 +56,7 @@ jobs:
           submodules: recursive
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@908c540300062bd5a7e473851cdb4282204cee09 # v1.9.1
         with:
           version: ${{ env.FOUNDRY_VERSION }}
 
@@ -89,7 +89,7 @@ jobs:
           submodules: recursive
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@908c540300062bd5a7e473851cdb4282204cee09 # v1.9.1
         with:
           version: ${{ env.FOUNDRY_VERSION }}
 
@@ -124,7 +124,7 @@ jobs:
           submodules: recursive
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@908c540300062bd5a7e473851cdb4282204cee09 # v1.9.1
         with:
           version: ${{ env.FOUNDRY_VERSION }}