diff --git a/examples/camping/Gemfile b/examples/camping/Gemfile
index 71fe30600..e74109b57 100644
--- a/examples/camping/Gemfile
+++ b/examples/camping/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rack', '~> 2.2.0'
+gem 'rack', '~> 2.2.18'
 gem 'rackup'
 gem 'camping', '< 3'
 gem 'markaby'
diff --git a/examples/camping/Gemfile.lock b/examples/camping/Gemfile.lock
index 589e167f9..4f82f8951 100644
--- a/examples/camping/Gemfile.lock
+++ b/examples/camping/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
     markaby (0.9.4)
       builder
     ostruct (0.6.2)
-    rack (2.2.17)
+    rack (2.2.18)
     rackup (1.0.1)
       rack (< 3)
       webrick
@@ -35,12 +35,13 @@ GEM
 
 PLATFORMS
   java
+  x86_64-linux
 
 DEPENDENCIES
   camping (< 3)
   jruby-jars (< 10)
   markaby
-  rack (~> 2.2.0)
+  rack (~> 2.2.18)
   rackup
   warbler!