diff --git a/.github/workflows/recibo_python_test.yaml b/.github/workflows/recibo_python_test.yaml
index d1b52dc..9b2b596 100644
--- a/.github/workflows/recibo_python_test.yaml
+++ b/.github/workflows/recibo_python_test.yaml
@@ -32,15 +32,20 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
       - name: Check out repository code
-        uses: actions/checkout@v4
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Update submodules
         run: git submodule update --init --recursive
         shell: bash
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@50d5a8956f2e319df19e6b57539d7e2acb9f8c1e # v1.5.0
         with:
           version: nightly
 
diff --git a/.github/workflows/recibo_test.yaml b/.github/workflows/recibo_test.yaml
index d36f647..0efe8d9 100644
--- a/.github/workflows/recibo_test.yaml
+++ b/.github/workflows/recibo_test.yaml
@@ -31,15 +31,20 @@ jobs:
   run_recibo_tests:
     runs-on: ubuntu-latest
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
       - name: Check out repository code
-        uses: actions/checkout@v4
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Update submodules
         run: git submodule update --init --recursive
         shell: bash
 
       - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@50d5a8956f2e319df19e6b57539d7e2acb9f8c1e # v1.5.0
         with:
           version: nightly