diff --git a/Gemfile.lock b/Gemfile.lock
index 247a89a..b93964a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,6 @@ GEM
   remote: https://rubygems.org/
   specs:
     ansi (1.5.0)
-    backports (3.15.0)
     bcrypt (3.1.13)
     builder (3.2.3)
     erubis (2.7.0)
@@ -12,28 +11,29 @@ GEM
       builder
       minitest (>= 5.0)
       ruby-progressbar
-    multi_json (1.14.1)
-    mustermann (1.0.3)
-    rack (2.2.3)
-    rack-protection (2.0.7)
+    multi_json (1.15.0)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     redcarpet (3.5.0)
     ruby-progressbar (1.10.1)
-    sinatra (2.0.7)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.7)
-      backports (>= 2.8.2)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.7)
-      sinatra (= 2.0.7)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby