diff --git a/Gemfile.lock b/Gemfile.lock
index 59c5089..7ec8673 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,6 @@ GEM
       activesupport (>= 4.2.6)
       nokogiri (~> 1.6, >= 1.6.4)
       roxml (>= 3.3.1)
-    backports (3.16.1)
     concurrent-ruby (1.1.6)
     diff-lcs (1.3)
     dotenv (2.7.5)
@@ -19,13 +18,13 @@ GEM
       concurrent-ruby (~> 1.0)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
-    multi_json (1.14.1)
-    mustermann (1.1.1)
+    multi_json (1.15.0)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
-    rack (2.2.2)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -45,18 +44,17 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
-    ruby2_keywords (0.0.2)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    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 (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
       tilt (~> 2.0)
     sinatra-param (1.6.0)
       sinatra (>= 1.3)
@@ -65,7 +63,7 @@ GEM
       tilt (>= 2.0.6, < 2.1)
     temple (0.8.2)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (1.2.6)
       thread_safe (~> 0.1)
     zeitwerk (2.3.0)