diff --git a/yaml/yaml2/Gemfile b/yaml/yaml2/Gemfile
index 47ed65e..9bcc6d9 100644
--- a/yaml/yaml2/Gemfile
+++ b/yaml/yaml2/Gemfile
@@ -1,3 +1,3 @@
 source 'https://rubygems.org/'
 
-gem 'sinatra', '~> 2.2.0'
+gem 'sinatra', '~> 2.2.3'
diff --git a/yaml/yaml2/Gemfile.lock b/yaml/yaml2/Gemfile.lock
index d150837..10d5e60 100644
--- a/yaml/yaml2/Gemfile.lock
+++ b/yaml/yaml2/Gemfile.lock
@@ -1,24 +1,24 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     rack (2.2.6.2)
-    rack-protection (2.2.0)
+    rack-protection (2.2.3)
       rack
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.2.0)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (~> 2.2.0)
+  sinatra (~> 2.2.3)
 
 BUNDLED WITH
    1.16.2