diff --git a/Gemfile b/Gemfile
index ba44402da79..9462490a73a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,7 +35,7 @@ gem 'redis-namespace'
 
 gem 'active_model_serializers', '~> 0.8.3'
 
-gem 'onebox', '1.8.20'
+gem 'onebox', '1.8.21'
 
 gem 'http_accept_language', '~>2.0.5', require: false
 
diff --git a/Gemfile.lock b/Gemfile.lock
index a6a376a17e3..046407fc5d5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -228,7 +228,7 @@ GEM
     omniauth-twitter (1.3.0)
       omniauth-oauth (~> 1.1)
       rack
-    onebox (1.8.20)
+    onebox (1.8.21)
       fast_blank (>= 1.0.0)
       htmlentities (~> 4.3)
       moneta (~> 1.0)
@@ -464,7 +464,7 @@ DEPENDENCIES
   omniauth-oauth2
   omniauth-openid
   omniauth-twitter
-  onebox (= 1.8.20)
+  onebox (= 1.8.21)
   openid-redis-store
   pg
   pry-nav