diff --git a/action.yml b/action.yml
index 27b7057..3a82b54 100644
--- a/action.yml
+++ b/action.yml
@@ -24,4 +24,4 @@ inputs:
     default: ${{ github.token }}
 runs:
   using: 'docker'
-  image: 'Dockerfile'
+  image: 'docker://aburgess/checkout:sha256:b3dd2000ed05dbfd217c58b1086fa1527269fa5fafc81fe6599defd7e22d97ab'