diff --git a/index.js b/index.js
index 8b03bf2..c8cf423 100644
--- a/index.js
+++ b/index.js
@@ -28,7 +28,7 @@ Toolkit.run(async tools => {
     await tools.runInWorkspace('git', ['config', 'user.name', '"Automated Version Bump"'])
     await tools.runInWorkspace('git', ['config', 'user.email', '"gh-action-bump-version@users.noreply.github.com"'])
 
-    const currentBranch = /refs\/[a-zA-Z]+\/(.*)/.exec(process.env.GITHUB_REF)
+    const currentBranch = /refs\/[a-zA-Z]+\/(.*)/.exec(process.env.GITHUB_REF)[1]
     console.log('currentBranch:', currentBranch)
     await tools.runInWorkspace('git', ['checkout', currentBranch])
     await tools.runInWorkspace('npm',