diff --git a/assets/ruby_simple/Gemfile b/assets/ruby_simple/Gemfile
index 04416be..e0952e6 100644
--- a/assets/ruby_simple/Gemfile
+++ b/assets/ruby_simple/Gemfile
@@ -1,4 +1,4 @@
 source 'https://rubygems.org'
 
-gem 'rack', '~> 2.0'
-gem 'sinatra'
+gem 'rack', '~> 2.1', '>= 2.1.3'
+gem 'sinatra', '>= 2.0.5'
diff --git a/assets/ruby_simple/Gemfile.lock b/assets/ruby_simple/Gemfile.lock
index 3bbe525..62fb01e 100644
--- a/assets/ruby_simple/Gemfile.lock
+++ b/assets/ruby_simple/Gemfile.lock
@@ -1,23 +1,25 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (1.0.3)
-    rack (2.1.1)
-    rack-protection (2.0.5)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.2)
+    rack-protection (2.0.8.1)
       rack
-    sinatra (2.0.5)
+    ruby2_keywords (0.0.2)
+    sinatra (2.0.8.1)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.5)
+      rack-protection (= 2.0.8.1)
       tilt (~> 2.0)
-    tilt (2.0.9)
+    tilt (2.0.10)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  rack (~> 2.0)
-  sinatra
+  rack (~> 2.1, >= 2.1.3)
+  sinatra (>= 2.0.5)
 
 BUNDLED WITH
    1.17.3