diff --git a/Gemfile b/Gemfile
index 6299f60..1d6a9cb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.7.0'
 
 # Web
-gem 'sinatra', '~> 2.0', '>= 2.0.8.1'
+gem 'sinatra', '~> 2.2'
 gem 'sinatra-contrib', '~> 2.0', '>= 2.0.8.1'
 gem 'slim', '~> 4.0', '>= 4.0.1'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index ea073d4..91194c3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,18 +9,17 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2)
-    backports (3.15.0)
     concurrent-ruby (1.1.5)
     diff-lcs (1.3)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     minitest (5.14.0)
     multi_json (1.14.1)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     paint (2.1.1)
-    rack (2.1.1)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     redis (4.1.3)
     rspec (3.9.0)
@@ -36,25 +35,24 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
-    ruby2_keywords (0.0.2)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.3)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      mustermann (~> 2.0)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
       tilt (~> 2.0)
     slim (4.0.1)
       temple (>= 0.7.6, < 0.9)
       tilt (>= 2.0.6, < 2.1)
     temple (0.8.2)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (1.2.6)
       thread_safe (~> 0.1)
     zeitwerk (2.2.2)
@@ -68,7 +66,7 @@ DEPENDENCIES
   paint (~> 2.0)
   redis (~> 4.0)
   rspec (~> 3.9)
-  sinatra (~> 2.0, >= 2.0.8.1)
+  sinatra (~> 2.2)
   sinatra-contrib (~> 2.0, >= 2.0.8.1)
   slim (~> 4.0, >= 4.0.1)