diff --git a/Gemfile.lock b/Gemfile.lock
index 3f55bb3..71e9431 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -144,8 +144,8 @@ GEM
       activesupport (>= 4.2.0)
     hashie (3.6.0)
     http-2 (0.10.1)
-    httparty (0.20.0)
-      mime-types (~> 3.0)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)