diff --git a/CHANGELOG.md b/CHANGELOG.md
index 226e9b4c..065a5005 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 Changes by Version
 ==================
 
+2.26.1 (unreleased)
+-------------------
+- Nothing yet.
+
 2.26.0 (2021-04-16)
 -------------------
 - Delete a baggage item when value is blank (#562) -- evan.kim
diff --git a/constants.go b/constants.go
index 8da3e252..8d258430 100644
--- a/constants.go
+++ b/constants.go
@@ -22,7 +22,7 @@ import (
 
 const (
 	// JaegerClientVersion is the version of the client library reported as Span tag.
-	JaegerClientVersion = "Go-2.26.0"
+	JaegerClientVersion = "Go-2.26.1-dev"
 
 	// JaegerClientVersionTagKey is the name of the tag used to report client version.
 	JaegerClientVersionTagKey = "jaeger.version"