diff --git a/govuk-components.gemspec b/govuk-components.gemspec
index 19c8cc7f..41e0f836 100644
--- a/govuk-components.gemspec
+++ b/govuk-components.gemspec
@@ -43,7 +43,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency("rubypants", "~> 0.7.0")
   spec.add_development_dependency("sass")
   spec.add_development_dependency("sassc", "~> 2.4.0")
-  spec.add_development_dependency("slim", "~> 5.1.0")
+  spec.add_development_dependency("slim", "~> 5.2.0")
   spec.add_development_dependency("slim_lint", "~> 0.24.0")
   spec.add_development_dependency("webrick", "~> 1.8.1")
 end