diff --git a/Gemfile b/Gemfile
index 2b4878924..e99749291 100644
--- a/Gemfile
+++ b/Gemfile
@@ -108,7 +108,7 @@ gem 'mobile-fu'
 
 gem 'will_paginate'
 gem 'client_side_validations'
-gem 'gon'
+gem 'gon', '~> 4.0'
 
 # assets
 
diff --git a/Gemfile.lock b/Gemfile.lock
index e24eccd04..780134c5f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -199,7 +199,7 @@ GEM
       ruby-progressbar (~> 0.0.10)
     gherkin (2.11.0)
       json (>= 1.4.6)
-    gon (3.0.4)
+    gon (4.0.0)
       actionpack (>= 2.3.0)
       json
     guard (1.1.1)
@@ -497,7 +497,7 @@ DEPENDENCIES
   foreigner (~> 1.2.1)
   foreman (= 0.57)
   fuubar (>= 1.0)
-  gon
+  gon (~> 4.0)
   guard-cucumber
   guard-rspec
   guard-spork