diff --git a/Gemfile.lock b/Gemfile.lock
index f1acb00..dd2ff67 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,12 +13,10 @@ GEM
     git (1.11.0)
       rchardet (~> 1.8)
     hashdiff (0.3.8)
-    httparty (0.16.3)
-      mime-types (~> 3.0)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
-    mime-types (3.2.2)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2018.0812)
+    mini_mime (1.1.2)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
     octokit (4.13.0)