diff --git a/sample-ruby/Gemfile b/sample-ruby/Gemfile
index 424ece9..a3ea231 100644
--- a/sample-ruby/Gemfile
+++ b/sample-ruby/Gemfile
@@ -1,4 +1,4 @@
 source "https://rubygems.org"
-gem "sinatra", "~> 2.2"
+gem "sinatra", "~> 4.2"
 gem "webrick", "~> 1.7"
 
diff --git a/sample-ruby/Gemfile.lock b/sample-ruby/Gemfile.lock
index 9a74875..88a38ec 100644
--- a/sample-ruby/Gemfile.lock
+++ b/sample-ruby/Gemfile.lock
@@ -1,25 +1,34 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (2.0.2)
+    base64 (0.3.0)
+    logger (1.7.0)
+    mustermann (3.0.4)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.8)
-    rack-protection (2.2.3)
-      rack
+    rack (3.2.3)
+    rack-protection (4.2.0)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.3)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.3)
+    sinatra (4.2.0)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.2.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    tilt (2.0.11)
+    tilt (2.6.1)
     webrick (1.7.0)
 
 PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  sinatra (~> 2.2)
+  sinatra (~> 4.2)
   webrick (~> 1.7)
 
 BUNDLED WITH