diff --git a/CHANGELOG.md b/CHANGELOG.md
index 37af8c8..1d1fc6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Cookstyle fixes
+- ChefSpec fixes
 
 ## 5.3.1 (2018-07-24)
 
diff --git a/spec/default_spec.rb b/spec/default_spec.rb
index 887b3a9..e067a53 100644
--- a/spec/default_spec.rb
+++ b/spec/default_spec.rb
@@ -7,7 +7,7 @@ describe 'postfix::default' do
 
   context 'on Centos 6' do
     cached(:chef_run) do
-      ChefSpec::SoloRunner.new(platform: 'centos', version: 6.9).converge(described_recipe)
+      ChefSpec::SoloRunner.new(platform: 'centos', version: '6').converge(described_recipe)
     end
 
     it '[COOK-4423] renders file main.cf with /etc/pki/tls/cert.pem' do