diff --git a/Gemfile.lock b/Gemfile.lock
index 7e95396..94dd0e9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,35 +14,35 @@ GEM
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     arel (6.0.4)
-    backports (3.15.0)
     builder (3.2.3)
     concurrent-ruby (1.1.5)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     minitest (5.13.0)
-    multi_json (1.14.1)
-    mustermann (1.0.3)
+    multi_json (1.15.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     mysql2 (0.5.2)
-    rack (2.0.7)
-    rack-protection (2.0.7)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rdiscount (2.2.0.1)
-    sinatra (2.0.7)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     sinatra-activerecord (2.0.14)
       activerecord (>= 3.2)
       sinatra (>= 1.0)
-    sinatra-contrib (2.0.7)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.7)
-      sinatra (= 2.0.7)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     sqlite3 (1.3.10)
     thread_safe (0.3.6)