diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8b41da..523f697 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Upcoming Changes (unreleased)
 
+## 0.6.21 - April 12, 2018
+- added option to set multiple strings to ```Phonelib.extension_separate_symbols``` by passing an array. Refer to README.
+- updated data
+
 ## 0.6.20 - April 3, 2018
 - added national prefix transformation rule to parsing process
 - updated data
diff --git a/Gemfile.lock b/Gemfile.lock
index a38d060..341f651 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    phonelib (0.6.20)
+    phonelib (0.6.21)
 
 GEM
   remote: http://rubygems.org/
diff --git a/lib/phonelib/version.rb b/lib/phonelib/version.rb
index 4890768..63aee22 100644
--- a/lib/phonelib/version.rb
+++ b/lib/phonelib/version.rb
@@ -1,4 +1,4 @@
 module Phonelib
   # @private
-  VERSION = '0.6.20'
+  VERSION = '0.6.21'
 end