diff --git a/Gemfile.lock b/Gemfile.lock
index 4bf3451..879fe08 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     addressable (2.2.8)
     bcrypt-ruby (3.0.1)
@@ -65,9 +65,11 @@ GEM
     json (1.7.4)
     json_pure (1.7.4)
     multi_json (1.3.6)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.5.5)
-    rack (1.4.1)
-    rack-protection (1.2.0)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (0.6.1)
       rack (>= 1.0)
@@ -81,12 +83,14 @@ GEM
       diff-lcs (~> 1.1.3)
     rspec-mocks (2.11.1)
     ruby-ip (0.9.1)
+    ruby2_keywords (0.0.5)
     sanitize (2.0.3)
       nokogiri (>= 1.4.4, < 1.6)
-    sinatra (1.3.2)
-      rack (~> 1.3, >= 1.3.6)
-      rack-protection (~> 1.2)
-      tilt (~> 1.3, >= 1.3.3)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     sinatra-session (1.0.0)
       sinatra (>= 1.0)
     stringex (1.4.0)
@@ -94,7 +98,7 @@ GEM
       daemons (>= 1.0.9)
       eventmachine (>= 0.12.6)
       rack (>= 1.0.0)
-    tilt (1.3.3)
+    tilt (2.0.11)
     uuidtools (2.1.3)
 
 PLATFORMS