diff --git a/examples/Gemfile b/examples/Gemfile
index e5f5c56..46e1d7d 100644
--- a/examples/Gemfile
+++ b/examples/Gemfile
@@ -7,5 +7,5 @@ gem 'haml', '>= 5.0.0'
 gem 'libv8', '~> 3.16'
 gem 'thin'
 gem 'rest-client', '~> 2.1.0'
-gem 'sinatra', '~> 2.1.0'
+gem 'sinatra', '~> 2.2.3'
 gem 'therubyracer', '~> 0.12', require: 'v8'
diff --git a/examples/Gemfile.lock b/examples/Gemfile.lock
index cdf826c..84648eb 100644
--- a/examples/Gemfile.lock
+++ b/examples/Gemfile.lock
@@ -22,11 +22,11 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0225)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
-    rack (2.2.3)
-    rack-protection (2.1.0)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     ref (2.0.0)
     rest-client (2.1.0)
@@ -34,11 +34,11 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    ruby2_keywords (0.0.4)
-    sinatra (2.1.0)
-      mustermann (~> 1.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.1.0)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     temple (0.8.2)
     therubyracer (0.12.3)
@@ -48,7 +48,7 @@ GEM
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    tilt (2.0.10)
+    tilt (2.0.11)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.7)
@@ -62,7 +62,7 @@ DEPENDENCIES
   haml (>= 5.0.0)
   libv8 (~> 3.16)
   rest-client (~> 2.1.0)
-  sinatra (~> 2.1.0)
+  sinatra (~> 2.2.3)
   therubyracer (~> 0.12)
   thin