diff --git a/middleman-core/middleman-core.gemspec b/middleman-core/middleman-core.gemspec
index a58e33c6..5cc0690d 100644
--- a/middleman-core/middleman-core.gemspec
+++ b/middleman-core/middleman-core.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |s|
   s.add_dependency('i18n', ['~> 0.7.0'])
 
   # Automatic Image Sizes
-  s.add_dependency('fastimage', ['~> 1.7.0'])
+  s.add_dependency('fastimage', ['~> 1.8'])
 
   # Minify CSS
   s.add_dependency('sass', ['>= 3.4'])