diff --git a/dist/index.js b/dist/index.js
index 32099c3..c02324b 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -46806,6 +46806,7 @@ var require_github2 = __commonJS({
           const res = yield octokit.repos.getContent({
             owner,
             repo,
+            ref: `refs/heads/${branchName}`,
             path
           });
           sha = res.data.sha;
diff --git a/src/github.ts b/src/github.ts
index 818601b..feb174c 100644
--- a/src/github.ts
+++ b/src/github.ts
@@ -50,7 +50,8 @@ export async function createOrUpdateFile(octokit: Octokit, owner: string, repo:
         const res = await octokit.repos.getContent({
             owner: owner,
             repo: repo,
-            path: path,
+            ref: `refs/heads/${branchName}`,
+            path: path
         });
         sha = (res.data as any).sha;
     } catch (e) {