diff --git a/dist/index.js b/dist/index.js
index fe3f317..e42c0d4 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2021,7 +2021,7 @@ function getInputs() {
             }
         }
         // SHA?
-        else if (result.ref.match(/^[0-9a-fA-F]{40}$/)) {
+        else if (result.ref.match(/^(?:[0-9a-fA-F]{40}|[0-9a-fA-F]{64})$/)) {
             result.commit = result.ref;
             result.ref = '';
         }
diff --git a/src/input-helper.ts b/src/input-helper.ts
index 059232f..e0c61e2 100644
--- a/src/input-helper.ts
+++ b/src/input-helper.ts
@@ -71,7 +71,7 @@ export async function getInputs(): Promise<IGitSourceSettings> {
     }
   }
   // SHA?
-  else if (result.ref.match(/^[0-9a-fA-F]{40}$/)) {
+  else if (result.ref.match(/^(?:[0-9a-fA-F]{40}|[0-9a-fA-F]{64})$/)) {
     result.commit = result.ref
     result.ref = ''
   }