diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bbaf531..c8c80891 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 
 ## develop (unreleased)
+
+
+## 0.18.1 (3/11/2015)
 ### Changes
 * `Lldp#port_number` returns primitive Ruby objects.
 
diff --git a/lib/pio/version.rb b/lib/pio/version.rb
index d99e4379..3971296e 100644
--- a/lib/pio/version.rb
+++ b/lib/pio/version.rb
@@ -1,5 +1,5 @@
 # Base module.
 module Pio
   # gem version.
-  VERSION = '0.18.0'.freeze
+  VERSION = '0.18.1'.freeze
 end