diff --git a/middleman-core/middleman-core.gemspec b/middleman-core/middleman-core.gemspec
index 2245e16c..a589eb56 100644
--- a/middleman-core/middleman-core.gemspec
+++ b/middleman-core/middleman-core.gemspec
@@ -48,7 +48,7 @@ Gem::Specification.new do |s|
   s.add_dependency('sass', ['>= 3.4'])
 
   # Minify JS
-  s.add_dependency('uglifier', ['~> 2.6'])
+  s.add_dependency('uglifier', ['~> 3.0'])
   s.add_dependency('execjs', ['~> 2.0'])
 
   # Testing