diff --git a/Gemfile.lock b/Gemfile.lock
index 00ade4b..1ce4c97 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -58,7 +58,8 @@ GEM
     mini_portile2 (2.8.0)
     minitest (5.14.1)
     multi_json (1.13.1)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
     nokogiri (1.13.3)
       mini_portile2 (~> 2.8.0)
@@ -68,8 +69,8 @@ GEM
       method_source (~> 0.9.0)
     public_suffix (4.0.6)
     racc (1.6.0)
-    rack (2.2.3)
-    rack-protection (2.0.5)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -97,15 +98,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
+    ruby2_keywords (0.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     thin (1.8.1)
       daemons (~> 1.0, >= 1.0.9)
@@ -113,7 +115,7 @@ GEM
       rack (>= 1, < 3)
     thor (0.19.4)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tzinfo (1.2.7)
       thread_safe (~> 0.1)
     unf (0.1.4)