diff --git a/Gemfile b/Gemfile
index b82e885..c534417 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,5 +5,5 @@ group :development, :test do
   gem "rspec"
   gem "redis"
   gem "curb"
-  gem "sinatra", ">= 2.0.4"
+  gem "sinatra", ">= 2.0.8.1"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index f46e200..de77939 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,10 +3,10 @@ GEM
   specs:
     curb (0.9.10)
     diff-lcs (1.3)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack (2.2.6.3)
+    rack-protection (3.0.5)
       rack
     rake (13.0.1)
     redis (4.2.1)
@@ -23,13 +23,13 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.3)
-    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 (3.0.5)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.5)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.1.0)
 
 PLATFORMS
   ruby
@@ -39,7 +39,7 @@ DEPENDENCIES
   rake
   redis
   rspec
-  sinatra (>= 2.0.4)
+  sinatra (>= 2.0.8.1)
 
 BUNDLED WITH
    2.1.4