diff --git a/Gemfile.lock b/Gemfile.lock
index 3f5eee0..3eb0756 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,6 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (9.0.0)
-    backports (3.18.1)
     bcrypt (3.1.13)
     bond (0.5.1)
     coderay (1.1.3)
@@ -24,7 +23,7 @@ GEM
       concurrent-ruby (~> 1.0)
     method_source (1.0.0)
     minitest (5.14.1)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     pry (0.13.1)
@@ -33,7 +32,7 @@ GEM
     rack (2.2.3)
     rack-flash3 (1.0.5)
       rack
-    rack-protection (2.0.8.1)
+    rack-protection (2.2.0)
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -47,23 +46,22 @@ GEM
       rack (>= 1.0)
       rack-test (~> 0.6.2)
       ripl (>= 0.7.0)
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (2.0.8.1)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     sinatra-activerecord (2.0.18)
       activerecord (>= 4.1)
       sinatra (>= 1.0)
-    sinatra-contrib (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     sinatra-reloader (1.0)
       sinatra-contrib