diff --git a/dist/index.js b/dist/index.js
index 5f111c02..d5e02606 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -16022,7 +16022,7 @@ const setDynamicVars = () => {
 		context.ACTOR = github.context.actor
 		context.REF = github.context.ref
 		context.SHA = github.context.sha
-		context.BRANCH = github.context.ref.substr(11)
+		context.BRANCH = github.context.ref.substring('refs/heads/'.length)
 	}
 }
 
@@ -16245,7 +16245,7 @@ const {
 	SHA,
 	USER,
 	REPOSITORY,
-	REF,
+	BRANCH,
 	TRIM_COMMIT_MESSAGE,
 	BUILD_ENV,
 	PREBUILT,
@@ -16286,7 +16286,7 @@ const init = () => {
 				`githubCommitMessage=${ TRIM_COMMIT_MESSAGE ? commit.commitMessage.split(/\r?\n/)[0] : commit.commitMessage }`,
 				`githubCommitOrg=${ USER }`,
 				`githubCommitRepo=${ REPOSITORY }`,
-				`githubCommitRef=${ REF }`,
+				`githubCommitRef=${ BRANCH }`,
 				`githubCommitSha=${ SHA }`,
 				`githubOrg=${ USER }`,
 				`githubRepo=${ REPOSITORY }`,
diff --git a/src/config.js b/src/config.js
index 2f2eb22b..9e6985b1 100644
--- a/src/config.js
+++ b/src/config.js
@@ -136,7 +136,7 @@ const setDynamicVars = () => {
 		context.ACTOR = github.context.actor
 		context.REF = github.context.ref
 		context.SHA = github.context.sha
-		context.BRANCH = github.context.ref.substr(11)
+		context.BRANCH = github.context.ref.substring('refs/heads/'.length)
 	}
 }
 
diff --git a/src/vercel.js b/src/vercel.js
index 9370e8d9..17e9720b 100644
--- a/src/vercel.js
+++ b/src/vercel.js
@@ -11,7 +11,7 @@ const {
 	SHA,
 	USER,
 	REPOSITORY,
-	REF,
+	BRANCH,
 	TRIM_COMMIT_MESSAGE,
 	BUILD_ENV,
 	PREBUILT,
@@ -52,7 +52,7 @@ const init = () => {
 				`githubCommitMessage=${ TRIM_COMMIT_MESSAGE ? commit.commitMessage.split(/\r?\n/)[0] : commit.commitMessage }`,
 				`githubCommitOrg=${ USER }`,
 				`githubCommitRepo=${ REPOSITORY }`,
-				`githubCommitRef=${ REF }`,
+				`githubCommitRef=${ BRANCH }`,
 				`githubCommitSha=${ SHA }`,
 				`githubOrg=${ USER }`,
 				`githubRepo=${ REPOSITORY }`,