diff --git a/Gemfile.lock b/Gemfile.lock
index 7dc51cc..d245c83 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    proforma (0.4)
+    proforma (0.5)
       activemodel (>= 5.2.3, < 6.1.0)
       activesupport (>= 5.2.3, < 6.1.0)
       nokogiri (~> 1.10.2)
diff --git a/README.md b/README.md
index ebba0a6..533090a 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ This gem offers a ruby implementation of https://github.com/ProFormA/proformaxml
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'proforma', git: 'git://github.com/openHPI/proforma.git', tag: 'v0.3.1'
+gem 'proforma', git: 'git://github.com/openHPI/proforma.git', tag: 'v0.5'
 ```
 
 And then execute:
diff --git a/lib/proforma/version.rb b/lib/proforma/version.rb
index 4aaf0cc..0fc3944 100644
--- a/lib/proforma/version.rb
+++ b/lib/proforma/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Proforma
-  VERSION = '0.4'
+  VERSION = '0.5'
 end