diff --git a/.github/workflows/self-test.yml b/.github/workflows/self-test.yml
index 510da0d3..1f37930e 100644
--- a/.github/workflows/self-test.yml
+++ b/.github/workflows/self-test.yml
@@ -34,7 +34,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        clang-version: ['12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22']
+        clang-version: ['12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23']
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/action.yml b/action.yml
index 7dad9299..1076a995 100644
--- a/action.yml
+++ b/action.yml
@@ -39,7 +39,7 @@ inputs:
   version:
     description: |
       The desired version of the [clang-tools](https://github.com/cpp-linter/clang-tools-pip) to use.
-      Accepted options are strings which can be 22, 21, 20, 19, 18, 17, 16, 15, 14, 13 or 12.
+      Accepted options are strings which can be 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13 or 12.
 
       - Set this option to a blank string (`''`) to use the platform's default installed version.
       - This value can also be a path to where the clang tools are installed (if using a custom install location).