diff --git a/server/Gemfile.lock b/server/Gemfile.lock
index 433d5c7..fa1c90b 100644
--- a/server/Gemfile.lock
+++ b/server/Gemfile.lock
@@ -14,8 +14,8 @@ GEM
       multi_json (~> 1.0)
     addressable (2.3.2)
     arel (3.0.2)
-    async-rack (0.5.1)
-      rack (~> 1.1)
+    async-rack (0.4.0.1)
+      rack (>= 1.1.0)
     awesome_print (1.1.0)
     backports (2.6.4)
     builder (3.0.4)
@@ -62,12 +62,12 @@ GEM
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.3.1)
-    rack (1.4.4)
+    rack (2.2.3)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-accept-media-types (0.9)
-    rack-contrib (1.1.0)
-      rack (>= 0.9.1)
+    rack-contrib (2.2.0)
+      rack (~> 2.0)
     rack-mount (0.8.3)
       rack (>= 1.0.0)
     rack-respond_to (0.9.8)