diff --git a/Makefile b/Makefile
index 7b7d01a..dc1bef5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 OUTPUT_DIR = ./builds
+GIT_COMMIT = `git rev-parse HEAD`
 
 gotty: app/resource.go main.go app/*.go
 	godep go build
@@ -51,4 +52,4 @@ shasums:
 	cd ${OUTPUT_DIR}/dist; sha256sum * > ./SHA256SUMS
 
 release:
-	ghr --delete --prerelease -u yudai -r gotty pre-release ${OUTPUT_DIR}/dist
+	ghr -c ${GIT_COMMIT} --delete --prerelease -u yudai -r gotty pre-release ${OUTPUT_DIR}/dist
diff --git a/wercker.yml b/wercker.yml
index ba1c985..0e27057 100644
--- a/wercker.yml
+++ b/wercker.yml
@@ -29,4 +29,4 @@ deploy:
         code: make shasums OUTPUT_DIR=.
     - script:
         name: release
-        code: make release OUTPUT_DIR=.
+        code: make release OUTPUT_DIR=. GIT_COMMIT=$WERCKER_GIT_COMMIT