diff --git a/Gemfile.lock b/Gemfile.lock
index 6695f5b..f851914 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -55,7 +55,6 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.3)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.3)
@@ -67,8 +66,7 @@ GEM
     nio4r (1.2.1)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    rack (2.0.0.alpha)
-      json
+    rack (2.2.3)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.0.beta3)