diff --git a/Gemfile b/Gemfile
index f4d2688..0ba3302 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 source "https://rubygems.org"
 
 gem 'git', '~> 1.3'
-gem 'sinatra', '~> 2.0', '>= 2.0.3'
+gem 'sinatra', '~> 2.0', '>= 2.0.4'
 gem 'minitest', '~> 5.11', '>= 5.11.3'
 gem 'multi_json', '~> 1.13', '>= 1.13.1'
 gem 'mail', '~> 2.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index 00d841e..5bf289d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,18 +13,20 @@ GEM
     minitest (5.11.3)
     multi_json (1.13.1)
     multi_xml (0.6.0)
-    mustermann (1.0.3)
-    rack (2.0.6)
-    rack-protection (2.0.4)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.2)
+    rack-protection (2.0.8.1)
       rack
-    sinatra (2.0.4)
+    ruby2_keywords (0.0.2)
+    sinatra (2.0.8.1)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.4)
+      rack-protection (= 2.0.8.1)
       tilt (~> 2.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    tilt (2.0.9)
+    tilt (2.0.10)
     unicode-display_width (1.4.0)
 
 PLATFORMS
@@ -36,7 +38,7 @@ DEPENDENCIES
   mail (~> 2.7)
   minitest (~> 5.11, >= 5.11.3)
   multi_json (~> 1.13, >= 1.13.1)
-  sinatra (~> 2.0, >= 2.0.3)
+  sinatra (~> 2.0, >= 2.0.4)
 
 BUNDLED WITH
-   1.17.1
+   1.17.3