diff --git a/Gemfile.lock b/Gemfile.lock
index 3dfdf8a..5a4f848 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,6 @@ GEM
       zeitwerk (~> 2.2)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    backports (3.17.0)
     bond (0.5.1)
     coderay (1.1.2)
     concurrent-ruby (1.1.6)
@@ -25,7 +24,7 @@ GEM
       concurrent-ruby (~> 1.0)
     method_source (1.0.0)
     minitest (5.14.0)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     pg (1.2.3)
@@ -33,8 +32,8 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.3)
-    rack (2.2.2)
-    rack-protection (2.0.8.1)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -47,26 +46,25 @@ 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)
     shrine (3.2.1)
       content_disposition (~> 1.0)
       down (~> 5.1)
-    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 (2.0.14)
       activerecord (>= 3.2)
       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)
     thread_safe (0.3.6)
     tilt (2.0.10)