diff --git a/Gemfile b/Gemfile
index 6aa38f8..d253b17 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ source 'https://rubygems.org'
 gem 'rack-cache', '~> 1.7', '>= 1.7.1'
 gem 'rest-client', '~> 2.0', '>= 2.0.2'
 gem 'rest-client-components', '~> 1.5'
-gem 'sinatra', '~> 2.0', '>= 2.0.1'
+gem 'sinatra', '~> 2.2'
 gem 'sinatra-contrib', '~> 2.0', '>= 2.0.1'
 # tools
 gem 'rake', '~> 12.0', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 006fe4d..6aecb5a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
     rack (2.2.4)
     rack-cache (1.13.0)
       rack (>= 0.4)
-    rack-protection (2.2.2)
+    rack-protection (2.2.3)
       rack
     rainbow (3.1.1)
     rake (12.3.3)
@@ -88,16 +88,16 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (2.2.2)
+    sinatra (2.2.3)
       mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    sinatra-contrib (2.2.2)
+    sinatra-contrib (2.2.3)
       multi_json
       mustermann (~> 2.0)
-      rack-protection (= 2.2.2)
-      sinatra (= 2.2.2)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
       tilt (~> 2.0)
     sinatra-flash (0.3.0)
       sinatra (>= 1.0.0)
@@ -128,7 +128,7 @@ DEPENDENCIES
   rubocop-rspec (~> 1.24)
   sass (~> 3.5, >= 3.5.6)
   shotgun (~> 0.9, >= 0.9.2)
-  sinatra (~> 2.0, >= 2.0.1)
+  sinatra (~> 2.2)
   sinatra-contrib (~> 2.0, >= 2.0.1)
   sinatra-flash (~> 0.3)
   tilt (~> 2.0, >= 2.0.8)