diff --git a/Gemfile.lock b/Gemfile.lock
index 6f25a05..b2d011d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,10 +127,13 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_portile2 (2.1.0)
     minitest (5.9.0)
     multi_json (1.12.1)
+    nio4r (2.5.7)
     nokogiri (1.6.8)
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
@@ -147,7 +150,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (3.4.0)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -227,7 +231,6 @@ GEM
       websocket (~> 1.0)
     sendgrid (1.2.4)
       json
-      json
     shoulda-matchers (3.1.1)
       activesupport (>= 4.0.0)
     slop (3.6.0)