diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 56ad342..a22f177 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
           python-version: "3.12"
 
       - name: Cache PlatformIO core + libraries
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.platformio/.cache
@@ -94,7 +94,7 @@ jobs:
           python-version: "3.12"
 
       - name: Cache PlatformIO core + libraries
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.platformio/.cache
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c588d3b..5f44e83 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -55,7 +55,7 @@ jobs:
           python-version: '3.12'
 
       - name: Cache PlatformIO
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.platformio/.cache
diff --git a/.github/workflows/lychee.yml b/.github/workflows/lychee.yml
index e9d90a5..5f986b8 100644
--- a/.github/workflows/lychee.yml
+++ b/.github/workflows/lychee.yml
@@ -33,7 +33,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Restore lychee cache (avoids re-checking unchanged URLs)
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .lycheecache
           key: lychee-${{ github.run_id }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index cf599dc..1092319 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -40,7 +40,7 @@ jobs:
           python-version: '3.12'
 
       - name: Cache PlatformIO + pip
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.platformio