diff --git a/Makefile b/Makefile
index db6202f..b7d835a 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@
 PROJECT=github.com/takama/backer
 
 # Use the 0.0.0 tag for testing, it shouldn't clobber any release builds
-RELEASE?=v0.3.7
+RELEASE?=v0.3.8
 
 BUILDTAGS=