diff --git a/Gemfile.lock b/Gemfile.lock
index 6f25a05..2843b91 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,7 +147,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (3.4.0)
+    puma (3.12.4)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -227,7 +227,6 @@ GEM
       websocket (~> 1.0)
     sendgrid (1.2.4)
       json
-      json
     shoulda-matchers (3.1.1)
       activesupport (>= 4.0.0)
     slop (3.6.0)