diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 93cb5595..d6ca1f21 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,7 +49,7 @@ jobs:
         run: make check-fmt
       - name: Cache Whitaker installer
         if: matrix.rust == 'stable'
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830  # v4.3.0
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v6.1.0
         with:
           path: |
             ~/.cargo/bin/whitaker-installer
@@ -81,7 +81,7 @@ jobs:
           python-version: '3.13'
           enable-cache: true
       - name: Cache shared spelling dictionary
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830  # v4.3.0
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v6.1.0
         with:
           path: |
             .typos-oxendict-base.json
@@ -136,7 +136,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@4cda7d73322c50eac316ad623a716f09a2db2ac7  # v3.1.2
       - name: Cache Kani tools
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830  # v4.3.0
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v6.1.0
         with:
           path: |
             .kani-cargo
diff --git a/.github/workflows/netsukefile-test.yml b/.github/workflows/netsukefile-test.yml
index 29f78fe0..98dd206c 100644
--- a/.github/workflows/netsukefile-test.yml
+++ b/.github/workflows/netsukefile-test.yml
@@ -30,7 +30,7 @@ jobs:
           rustc --version
           cargo --version
       - name: Cache Cargo
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684  # v4
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v4
         with:
           # Do not cache build outputs when running make clean
           path: |