diff --git a/Gemfile.lock b/Gemfile.lock
index dce3f0d..ce15825 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     factory_girl_rails (4.8.0)
-      factory_girl (~> 4.8.0)
+      factory_girl (~> 4.9.0)
       railties (>= 3.0.0)
 
 GEM
@@ -63,7 +63,7 @@ GEM
     diff-lcs (1.2.5)
     erubis (2.7.0)
     execjs (2.0.2)
-    factory_girl (4.8.0)
+    factory_girl (4.9.0)
       activesupport (>= 3.0.0)
     ffi (1.9.3)
     ffi (1.9.3-java)
diff --git a/factory_girl_rails.gemspec b/factory_girl_rails.gemspec
index 28d3e6d..507dc48 100644
--- a/factory_girl_rails.gemspec
+++ b/factory_girl_rails.gemspec
@@ -16,5 +16,5 @@ Gem::Specification.new do |s|
   s.license       = "MIT"
 
   s.add_runtime_dependency('railties', '>= 3.0.0')
-  s.add_runtime_dependency('factory_girl', '~> 4.8.0')
+  s.add_runtime_dependency('factory_girl', '~> 4.9.0')
 end