diff --git a/.github/workflows/auto-tag.yml b/.github/workflows/auto-tag.yml
index 9267c57..33446ca 100644
--- a/.github/workflows/auto-tag.yml
+++ b/.github/workflows/auto-tag.yml
@@ -1,3 +1,4 @@
+name: Auto-tag
 on:
   push:
     tags:
@@ -8,7 +9,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Auto-tag
-        uses: emteknetnz/gha-auto-tag@main
-        with:
-          ref: ${{ github.ref }}
-          sha: ${{ github.sha }}
+        uses: silverstripe/gha-auto-tag@main
diff --git a/README.md b/README.md
index fb04cd5..aa48018 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,9 @@ Using the 'v' prefix to avoid confusion with the '2' branch naming convention th
 
 ## Usage
 
-.github/workflows/auto-tag.yml
+This action has no configuration or inputs - just add the following workflow verbatim.
+
+**.github/workflows/auto-tag.yml**
 ```yml
 on:
   push:
@@ -27,8 +29,4 @@ jobs:
     steps:
       - name: Auto-tag
         uses: silverstripe/gha-auto-tag@main
-        with:
-          ref: ${{ github.ref }}
-          sha: ${{ github.sha }}
-
 ```
diff --git a/action.yml b/action.yml
index 0c7e68e..d17cedf 100644
--- a/action.yml
+++ b/action.yml
@@ -1,48 +1,22 @@
 name: Auto-tag
 description: Automatically delete and re-release tags so that other github action modules can use something similar to carets e.g. v0.1 or v3
-inputs:
-  ref:
-    type: string
-    required: true
-    description: github.ref when workflow is triggered by x.y.z semver tag e.g. refs/tags/0.1.23
-  sha:
-    type: string
-    required: true
-    description: SHA of the tag
 
 runs:
   using: composite
   steps:
-    - name: Validate inputs
-      shell: bash
-      env:
-        REF: ${{ inputs.ref }}
-        SHA: ${{ inputs.sha }}
-      run: |
-        # refs/tags/0.1.23 => 0.1.23
-        TAG=$(echo $REF | cut -c 11-)
-        if [[ "$TAG" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
-          echo "Valid tag $TAG"
-        else
-          echo "Invalid tag $TAG"
-          exit 1
-        fi
-        if [[ "$SHA" =~ ^[0-9a-f]{40}$ ]]; then
-          echo "Valid sha $SHA"
-        else
-          echo "Invalid sha $SHA"
-          exit 1
-        fi
 
     - name: Generate tag name
       id: generate_tag_name
       shell: bash
       env:
-        REF: ${{ inputs.ref }}
+        GITHUB_REF: ${{ github.ref }}
       run: |
         # refs/tags/0.1.23 => 0.1.23
-        TAG=$(echo $REF | cut -c 11-)
-        [[ $TAG =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]
+        TAG=$(echo $GITHUB_REF | cut -c 11-)
+        if ! [[ $TAG =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
+          echo "Invalid semver tag $TAG"
+          exit 1
+        fi 
         MAJOR="${BASH_REMATCH[1]}"
         MINOR="${BASH_REMATCH[2]}"
         PATCH="${BASH_REMATCH[3]}"
@@ -56,7 +30,6 @@ runs:
     - name: Add tag to repo
       uses: silverstripe/gha-tag-release@main
       with:
-        sha: ${{ github.sha }}
         tag: ${{ steps.generate_tag_name.outputs.tag }}
         delete_existing: true
         release: false