diff --git a/Gemfile b/Gemfile
index 2d73c58..0d64b6b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "http://rubygems.org"
 ruby "2.4.2"
 
 gem 'builder'
-gem 'sinatra', '~> 1.3.2'
+gem 'sinatra', '~> 2.2.3'
 gem 'redcarpet'
 gem 'coderay', '0.9.6'  
 gem 'dragonfly', '0.8.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4b2b4b0..8732ac3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,21 +11,25 @@ GEM
       thor (>= 0.13.6)
     http_accept_language (1.0.2)
     multi_json (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     puma (3.11.4)
-    rack (1.6.5)
+    rack (2.2.4)
     rack-contrib (1.1.0)
       rack (>= 0.9.1)
-    rack-protection (1.2.0)
+    rack-protection (2.2.3)
       rack
     redcarpet (2.2.2)
+    ruby2_keywords (0.0.5)
     shotgun (0.9)
       rack (>= 1.0)
-    sinatra (1.3.2)
-      rack (~> 1.3, >= 1.3.6)
-      rack-protection (~> 1.2)
-      tilt (~> 1.3, >= 1.3.3)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     thor (0.18.1)
-    tilt (1.3.3)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
@@ -41,7 +45,7 @@ DEPENDENCIES
   rack-contrib
   redcarpet
   shotgun
-  sinatra (~> 1.3.2)
+  sinatra (~> 2.2.3)
 
 RUBY VERSION
    ruby 2.4.2p198