diff --git a/minimal-mistakes-jekyll.gemspec b/minimal-mistakes-jekyll.gemspec
index 26f6a232ed..11eba516fc 100644
--- a/minimal-mistakes-jekyll.gemspec
+++ b/minimal-mistakes-jekyll.gemspec
@@ -23,6 +23,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll-data", "~> 1.0"
   spec.add_runtime_dependency "jemoji", "~> 0.8"
 
-  spec.add_development_dependency "bundler", "~> 1.12"
+  spec.add_development_dependency "bundler", "~> 1.15"
   spec.add_development_dependency "rake", "~> 10.0"
 end