diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d65b70e..28e2c242 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 Changes by Version
 ==================
 
+2.15.0 (unreleased)
+-------------------
+
+- nothing yet
+
+
 2.14.0 (2018-04-30)
 -------------------
 
diff --git a/constants.go b/constants.go
index bdd1554f..f733f599 100644
--- a/constants.go
+++ b/constants.go
@@ -16,7 +16,7 @@ package jaeger
 
 const (
 	// JaegerClientVersion is the version of the client library reported as Span tag.
-	JaegerClientVersion = "Go-2.14.0"
+	JaegerClientVersion = "Go-2.15.0-dev"
 
 	// JaegerClientVersionTagKey is the name of the tag used to report client version.
 	JaegerClientVersionTagKey = "jaeger.version"