diff --git a/.github/workflows/validate-action-typings.yml b/.github/workflows/validate-action-typings.yml
new file mode 100644
index 0000000..a81811a
--- /dev/null
+++ b/.github/workflows/validate-action-typings.yml
@@ -0,0 +1,10 @@
+name: Validate action typings
+
+on: [push, pull_request]
+
+jobs:
+  validate-typings:
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: actions/checkout@v3
+      - uses: krzema12/github-actions-typing@v0
diff --git a/action-types.yml b/action-types.yml
new file mode 100644
index 0000000..cac3649
--- /dev/null
+++ b/action-types.yml
@@ -0,0 +1,16 @@
+# See https://github.com/krzema12/github-actions-typing
+inputs:
+  args:
+    type: string
+  files:
+    type: string
+  files-excluded:
+    type: string
+  skipCommit:
+    type: boolean
+  version:
+    type: string
+  githubToken:
+    type: string
+  commitMessage:
+    type: string