diff --git a/.travis.yml b/.travis.yml
index be3bd52..009086e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 rvm:
-  - 2.2
+  - 2.3
 before_install: gem install bundler
 language: ruby
 script: script/cibuild
diff --git a/jekyll-titles-from-headings.gemspec b/jekyll-titles-from-headings.gemspec
index 583bedd..f092e66 100644
--- a/jekyll-titles-from-headings.gemspec
+++ b/jekyll-titles-from-headings.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
   s.license       = "MIT"
 
-  s.add_dependency "jekyll", "~> 3.3"
+  s.add_runtime_dependency "jekyll", ">= 3.0", "< 5.0"
   s.add_development_dependency "rspec", "~> 3.5"
   s.add_development_dependency "rubocop", "~> 0.43", "< 0.58"
 end
diff --git a/lib/jekyll-titles-from-headings/version.rb b/lib/jekyll-titles-from-headings/version.rb
index 59940ac..ff1ce63 100644
--- a/lib/jekyll-titles-from-headings/version.rb
+++ b/lib/jekyll-titles-from-headings/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module JekyllTitlesFromHeadings
-  VERSION = "0.5.1".freeze
+  VERSION = "0.5.2".freeze
 end