diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 9b329f2f..205a4b03 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -64,10 +64,10 @@ jobs:
     steps:
     - uses: ammaraskar/gcc-problem-matcher@master
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Checkout GUI
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: ${{ matrix.gui.repo }}
         path: ${{ matrix.gui.name }}
diff --git a/.github/workflows/divert_sim.yaml b/.github/workflows/divert_sim.yaml
index 34162ac9..3f93e8ae 100644
--- a/.github/workflows/divert_sim.yaml
+++ b/.github/workflows/divert_sim.yaml
@@ -22,47 +22,47 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           path: OpenEVSE_WiFi
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/MicroDebug
           path: MicroDebug
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/MicroTasks
           path: MicroTasks
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/StreamSpy
           path: StreamSpy
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/ConfigJson
           path: ConfigJson
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: bblanchon/ArduinoJson
           path: ArduinoJson
           ref: v6.20.1
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/OpenEVSE_Lib
           path: OpenEVSE_Lib
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/EpoxyDuino
           path: EpoxyDuino
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: JeremyPoulter/ESPAL
           path: ESPAL
diff --git a/.github/workflows/openapi_validate.yaml b/.github/workflows/openapi_validate.yaml
index 6e884f15..f41c4bd0 100644
--- a/.github/workflows/openapi_validate.yaml
+++ b/.github/workflows/openapi_validate.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # Check out the repository
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Run Spectral
       - uses: stoplightio/spectral-action@latest
diff --git a/.github/workflows/release_validation.yaml b/.github/workflows/release_validation.yaml
index 280c3ef6..719fd734 100644
--- a/.github/workflows/release_validation.yaml
+++ b/.github/workflows/release_validation.yaml
@@ -12,7 +12,7 @@ jobs:
     name: Pre-built GUI Validation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
 
@@ -49,7 +49,7 @@ jobs:
 
     steps:
       ### Check the version number in the code matches the tag number
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4