diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index f2b986e..6a7144a 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -10,12 +10,12 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
         with:
           submodules: recursive
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@c7450ba673e133f5ee30098b3b54f444d3a2ca2d
         with:
           version: nightly
 
diff --git a/.github/workflows/non-via-ir-compilation.yml b/.github/workflows/non-via-ir-compilation.yml
index c5da6d8..943912d 100644
--- a/.github/workflows/non-via-ir-compilation.yml
+++ b/.github/workflows/non-via-ir-compilation.yml
@@ -10,13 +10,13 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
         with:
           submodules: recursive
       - run: yarn install
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@c7450ba673e133f5ee30098b3b54f444d3a2ca2d
         with:
           version: nightly
 
diff --git a/.github/workflows/solc-version-tests.yml b/.github/workflows/solc-version-tests.yml
index 2fec1b0..1fd07d8 100644
--- a/.github/workflows/solc-version-tests.yml
+++ b/.github/workflows/solc-version-tests.yml
@@ -10,13 +10,13 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
         with:
           submodules: recursive
       - run: yarn install
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@c7450ba673e133f5ee30098b3b54f444d3a2ca2d
         with:
           version: nightly
 
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 7c687ac..47ce15b 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -10,13 +10,13 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
         with:
           submodules: recursive
       - run: yarn install
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@c7450ba673e133f5ee30098b3b54f444d3a2ca2d
         with:
           version: nightly