diff --git a/jekyll-commonmark-ghpages.gemspec b/jekyll-commonmark-ghpages.gemspec
index 1c6d380..3edd48d 100644
--- a/jekyll-commonmark-ghpages.gemspec
+++ b/jekyll-commonmark-ghpages.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "jekyll", "~> 3.9.0"
   spec.add_runtime_dependency "jekyll-commonmark", "~> 1.4.0"
-  spec.add_runtime_dependency "commonmarker", "~> 0.23.7"
+  spec.add_runtime_dependency "commonmarker", ">= 0.23.7", "< 1.1.0"
   spec.add_runtime_dependency "rouge", ">= 2.0", "< 5.0"
 
   spec.add_development_dependency "rspec", "~> 3.0"