diff --git a/sanitize.gemspec b/sanitize.gemspec
index 01e11bf..6a6bb6d 100644
--- a/sanitize.gemspec
+++ b/sanitize.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   # Runtime dependencies.
   s.add_dependency('crass',     '~> 0.2.0')
   s.add_dependency('nokogiri',  '>= 1.4.4')
-  s.add_dependency('nokogumbo', '~> 1.1.5')
+  s.add_dependency('nokogumbo', '1.1.5')
 
   # Development dependencies.
   s.add_development_dependency('minitest',  '~> 5.3.4')