diff --git a/examples/basic/Gemfile.lock b/examples/basic/Gemfile.lock
index 30f2396..fe6bd9e 100644
--- a/examples/basic/Gemfile.lock
+++ b/examples/basic/Gemfile.lock
@@ -5,7 +5,7 @@ PATH
       json-schema (>= 2.5)
       mustermann (~> 1.0.0.beta2)
       nokogiri (~> 1.6)
-      sinatra (~> 1.4)
+      sinatra (~> 2.0)
 
 GEM
   remote: https://rubygems.org/
@@ -14,18 +14,21 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     json-schema (2.8.1)
       addressable (>= 2.4)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.5.1)
     mustermann (1.0.3)
-    nokogiri (1.10.7)
-      mini_portile2 (~> 2.4.0)
-    public_suffix (4.0.1)
-    rack (1.6.11)
-    rack-protection (1.5.5)
+    nokogiri (1.11.4)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    public_suffix (4.0.6)
+    racc (1.5.2)
+    rack (2.2.3)
+    rack-protection (2.1.0)
       rack
-    sinatra (1.4.8)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    sinatra (2.1.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.1.0)
+      tilt (~> 2.0)
     tilt (2.0.10)
 
 PLATFORMS