diff --git a/Gemfile.lock b/Gemfile.lock
index 15f2023..0856628 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
     coderay (1.1.3)
     json (2.6.2)
     method_source (1.0.0)
-    mustermann (2.0.2)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     parallel (1.22.1)
@@ -25,7 +25,7 @@ GEM
     puma (5.6.5)
       nio4r (~> 2.0)
     rack (2.2.4)
-    rack-protection (2.2.2)
+    rack-protection (3.0.4)
       rack
     rainbow (3.1.1)
     regexp_parser (2.5.0)
@@ -50,10 +50,10 @@ GEM
       rubocop (~> 1.0)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.2)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.2)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     tilt (2.0.11)
     unicode-display_width (2.2.0)