diff --git a/opencensus/common/version.h b/opencensus/common/version.h
index 34b87413..f98f6340 100644
--- a/opencensus/common/version.h
+++ b/opencensus/common/version.h
@@ -17,6 +17,6 @@
 
 // The current version of the opencensus core library. Macro to allow literal
 // string concatenation in constexpr statements.
-#define OPENCENSUS_VERSION "0.4.0-dev"
+#define OPENCENSUS_VERSION "0.4.0"
 
 #endif  // OPENCENSUS_COMMON_VERSION_H_