diff --git a/History.txt b/History.txt
index 055cbf3e..58b2cf2b 100644
--- a/History.txt
+++ b/History.txt
@@ -1,3 +1,17 @@
+== 0.5.1 2014-10-12
+* Improvements
+  * Support for Oracle Ehnanced Adapter 1.5 and ActiveRecord 4.1, 4.2
+  * Oracle 12c support
+  * Better diagnostics output when ruby-oci8 initialization fails
+* Bug fixes
+  * Support for ruby-oci8 2.1.2+ preventing segfaults
+  * Multi-thread support (applies to oci8 connections)
+* Internal (development) improvements
+  * Tests database connection enhancements (eazy connect syntax, allow service name != db name)
+  * Tests migrated to rspec 3
+  * Tests coverage migrated from rcov to simplecov
+  * README update with how to run tests
+
 == 0.5.0 2012-04-16
 
 * Improvements
diff --git a/README.md b/README.md
index 17f1048c..cbb68801 100644
--- a/README.md
+++ b/README.md
@@ -176,6 +176,7 @@ CONTRIBUTORS
 * Wiehann Matthysen
 * Dayle Larson
 * Yasuo Honda
+* Yavor Nikolov
 
 LICENSE
 -------
diff --git a/VERSION b/VERSION
index 79a2734b..5d4294b9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.5.0
\ No newline at end of file
+0.5.1
\ No newline at end of file
diff --git a/ruby-plsql.gemspec b/ruby-plsql.gemspec
index 36a7cb3d..62f5fc33 100644
--- a/ruby-plsql.gemspec
+++ b/ruby-plsql.gemspec
@@ -2,16 +2,16 @@
 # DO NOT EDIT THIS FILE DIRECTLY
 # Instead, edit Jeweler::Tasks in Rakefile, and run 'rake gemspec'
 # -*- encoding: utf-8 -*-
-# stub: ruby-plsql 0.5.0 ruby lib
+# stub: ruby-plsql 0.5.1 ruby lib
 
 Gem::Specification.new do |s|
   s.name = "ruby-plsql"
-  s.version = "0.5.0"
+  s.version = "0.5.1"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.require_paths = ["lib"]
   s.authors = ["Raimonds Simanovskis"]
-  s.date = "2014-10-05"
+  s.date = "2014-10-12"
   s.description = "ruby-plsql gem provides simple Ruby API for calling Oracle PL/SQL procedures.\nIt could be used both for accessing Oracle PL/SQL API procedures in legacy applications\nas well as it could be used to create PL/SQL unit tests using Ruby testing libraries.\n"
   s.email = "raimonds.simanovskis@gmail.com"
   s.extra_rdoc_files = [