diff --git a/govuk-components.gemspec b/govuk-components.gemspec
index bec238c6..f8214afb 100644
--- a/govuk-components.gemspec
+++ b/govuk-components.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency("htmlbeautifier", "~> 1.4.1")
   spec.add_development_dependency("nanoc", "~> 4.11")
   spec.add_development_dependency("redcarpet", "~> 3.6.0")
-  spec.add_development_dependency("rouge", "~> 4.4.0")
+  spec.add_development_dependency("rouge", "~> 4.5.1")
   spec.add_development_dependency("rubypants", "~> 0.7.0")
   spec.add_development_dependency("sass")
   spec.add_development_dependency("sassc", "~> 2.4.0")