diff --git a/Gemfile.lock b/Gemfile.lock
index e3b5d54..468d8fd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,13 +48,13 @@ GEM
       nokogiri (>= 1.5.9)
     mini_portile2 (2.4.0)
     minitest (5.14.1)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     oj (3.10.6)
-    rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
@@ -76,16 +76,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.3)
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (1.2.7)
       thread_safe (~> 0.1)
     tzinfo-data (1.2020.1)