diff --git a/README.md b/README.md
index 8282d167..44498522 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@ gollum -- A git-based Wiki
 [![Build Status](https://travis-ci.org/gollum/gollum.svg?branch=master)](https://travis-ci.org/gollum/gollum)
 [![Open Source Helpers](https://www.codetriage.com/gollum/gollum/badges/users.svg)](https://www.codetriage.com/gollum/gollum)
 
+**Please update to gollum 5.1.1 to counter a recent exploit in the kramdown rendering gem, [CVE-2020-14001](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14001)**
+
 **Gollum version 5.0 is out!** See [here](https://github.com/gollum/gollum/wiki/5.0-release-notes) for a list of changes and new features compared to Gollum version 4.x, and see some [Screenshots](https://github.com/gollum/gollum/wiki/Screenshots) of Gollum's features.
 
 ## DESCRIPTION
diff --git a/gollum.gemspec b/gollum.gemspec
index 7d5d7da9..0aff4a5f 100644
--- a/gollum.gemspec
+++ b/gollum.gemspec
@@ -5,8 +5,8 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '>= 1.9'
 
   s.name              = 'gollum'
-  s.version           = '5.1'
-  s.date              = '2020-08-03'
+  s.version           = '5.1.1'
+  s.date              = '2020-08-11'
   s.license           = 'MIT'
 
   s.summary     = 'A simple, Git-powered wiki.'
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.extra_rdoc_files = %w[README.md LICENSE]
 
   s.add_dependency 'gollum-lib', '~> 5.0'
-  s.add_dependency 'kramdown', '~> 2.1.0'
+  s.add_dependency 'kramdown', '~> 2.3'
   s.add_dependency 'kramdown-parser-gfm', '~> 1.0.0'
   s.add_dependency 'sinatra', '~> 2.0'
   s.add_dependency 'sinatra-contrib', '~> 2.0'
diff --git a/lib/gollum.rb b/lib/gollum.rb
index d4580768..6308f17a 100644
--- a/lib/gollum.rb
+++ b/lib/gollum.rb
@@ -12,7 +12,7 @@ require 'rhino' if RUBY_PLATFORM == 'java'
 require File.expand_path('../gollum/uri_encode_component', __FILE__)
 
 module Gollum
-  VERSION = '5.1'
+  VERSION = '5.1.1'
 
   def self.assets_path
     ::File.expand_path('gollum/public', ::File.dirname(__FILE__))