diff --git a/fastly-rails.gemspec b/fastly-rails.gemspec
index 31cc341..82834fe 100644
--- a/fastly-rails.gemspec
+++ b/fastly-rails.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.test_files = Dir["test/**/*"]
 
   s.add_dependency "railties"
-  s.add_dependency 'fastly', '~> 1.3.0'
+  s.add_dependency 'fastly', '~> 1.4'
 
   s.add_runtime_dependency('mime-types', ['>= 1.16', '< 3'])