diff --git a/Gemfile.lock b/Gemfile.lock
index 87accb3..55e38fc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,7 @@
 GEM
   remote: http://rubygems.org/
   specs:
+    base64 (0.2.0)
     configuration (1.2.0)
     heroku (2.2.8)
       launchy (>= 0.3.2)
@@ -10,15 +11,26 @@ GEM
       configuration (>= 0.0.5)
       rake (>= 0.8.1)
     mime-types (1.16)
-    rack (1.3.0)
+    mustermann (3.0.3)
+      ruby2_keywords (~> 0.0.1)
+    rack (3.1.8)
+    rack-protection (4.0.0)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rake (0.9.2)
     rest-client (1.6.3)
       mime-types (>= 1.16)
-    sinatra (1.2.6)
-      rack (~> 1.1)
-      tilt (>= 1.2.2, < 2.0)
+    ruby2_keywords (0.0.5)
+    sinatra (4.0.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.0.0)
+      rack-session (>= 2.0.0, < 3)
+      tilt (~> 2.0)
     term-ansicolor (1.0.5)
-    tilt (1.3.2)
+    tilt (2.4.0)
 
 PLATFORMS
   ruby