diff --git a/Gemfile b/Gemfile
index c9e41b7..077eea6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
 source "https://rubygems.org"
 
-gem "sinatra", "~> 1.4.6"
+gem "sinatra", "~> 2.2.3"
diff --git a/Gemfile.lock b/Gemfile.lock
index dd7ee7e..e1e7175 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,17 +1,21 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rack (1.6.4)
-    rack-protection (1.5.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
-    sinatra (1.4.6)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
-    tilt (2.0.1)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (~> 1.4.6)
+  sinatra (~> 2.2.3)