diff --git a/Gemfile.lock b/Gemfile.lock
index 9589226d..236ad064 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,19 +18,21 @@ GEM
       concurrent-ruby (~> 1.0)
     method_source (0.8.2)
     minitest (5.14.1)
-    mustermann (1.0.3)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     pry (0.10.4)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (2.2.3)
-    rack-protection (2.0.7)
+    rack (2.2.7)
+    rack-protection (3.0.6)
       rack
     require_all (1.3.3)
-    sinatra (2.0.7)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.6)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.6)
       tilt (~> 2.0)
     sinatra-activerecord (2.0.12)
       activerecord (>= 3.2)
@@ -38,7 +40,7 @@ GEM
     slop (3.6.0)
     sqlite3 (1.3.13)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.2.0)
     tzinfo (1.2.7)
       thread_safe (~> 0.1)
     zeitwerk (2.3.0)