diff --git a/Gemfile.lock b/Gemfile.lock
index c35bab5..412db44 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,10 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.2.0)
     coderay (1.1.3)
     diff-lcs (1.4.4)
+    logger (1.6.1)
     method_source (1.0.0)
-    mustermann (2.0.2)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.7.3)
     pry (0.14.1)
@@ -12,11 +14,15 @@ GEM
       method_source (~> 1.0)
     puma (6.4.3)
       nio4r (~> 2.0)
-    rack (2.2.9)
-    rack-protection (2.2.3)
-      rack
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
+    rack (3.1.8)
+    rack-protection (4.1.0)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
+    rack-test (2.1.0)
+      rack (>= 1.3)
     rake (13.0.3)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
@@ -32,12 +38,14 @@ GEM
       rspec-support (~> 3.10.0)
     rspec-support (3.10.2)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.3)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.3)
+    sinatra (4.1.0)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    tilt (2.0.11)
+    tilt (2.4.0)
 
 PLATFORMS
   ruby