diff --git a/middleman-x86-mingw32.gemspec b/middleman-x86-mingw32.gemspec
index 02582ae1..80348d4f 100644
--- a/middleman-x86-mingw32.gemspec
+++ b/middleman-x86-mingw32.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_dependency("rack", ["~> 1.3.5"])
-  s.add_dependency("thin", ["~> 1.2.11"])
+  s.add_dependency("thin", ["~> 1.3.1"])
   s.add_dependency("thor", ["~> 0.14.0"])
   s.add_dependency("tilt", ["~> 1.3.1"])
   s.add_dependency("i18n", ["~> 0.6.0"])
diff --git a/middleman.gemspec b/middleman.gemspec
index 89e7084d..685096da 100644
--- a/middleman.gemspec
+++ b/middleman.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_dependency("rack", ["~> 1.3.5"])
-  s.add_dependency("thin", ["~> 1.2.11"])
+  s.add_dependency("thin", ["~> 1.3.1"])
   s.add_dependency("thor", ["~> 0.14.0"])
   s.add_dependency("tilt", ["~> 1.3.1"])
   s.add_dependency("i18n", ["~> 0.6.0"])