diff --git a/Gemfile b/Gemfile
index 162fdce..c4ed321 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |name| "https://github.com/#{name}.git" }
 source "https://rubygems.org"
 ruby File.read(File.join(File.dirname(__FILE__), ".ruby-version")).strip
 
-gem 'sinatra', '~> 2.1'
+gem 'sinatra', '~> 2.2'
 gem 'puma', '~> 5.6'
 gem 'rack-attack', '~> 6.5'
 gem 'redis-activesupport', '~> 5.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index f41c1b0..fa776c7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
       concurrent-ruby (~> 1.0)
     minitest (5.18.0)
     multi_json (1.15.0)
-    mustermann (1.1.2)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     puma (5.6.4)
@@ -22,7 +22,7 @@ GEM
     rack (2.2.7)
     rack-attack (6.6.0)
       rack (>= 1.0, < 3)
-    rack-protection (2.2.0)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -46,16 +46,16 @@ GEM
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
     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)
-    sinatra-contrib (2.2.0)
+    sinatra-contrib (2.2.3)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.2.0)
-      sinatra (= 2.2.0)
+      mustermann (~> 2.0)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
       tilt (~> 2.0)
     sinatra-reloader (1.0)
       sinatra-contrib
@@ -77,7 +77,7 @@ DEPENDENCIES
   rack-test (~> 1.1)
   redis-activesupport (~> 5.2)
   rspec (~> 3.10)
-  sinatra (~> 2.1)
+  sinatra (~> 2.2)
   sinatra-reloader (~> 1.0)
 
 RUBY VERSION