diff --git a/pkgs/development/tools/chefdk/Gemfile.lock b/pkgs/development/tools/chefdk/Gemfile.lock
index 139649b78f14..545375d87805 100644
--- a/pkgs/development/tools/chefdk/Gemfile.lock
+++ b/pkgs/development/tools/chefdk/Gemfile.lock
@@ -252,7 +252,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.1)
-    rack (2.0.3)
+    rack (2.0.6)
     rainbow (2.2.2)
       rake
     rake (12.3.0)
@@ -397,4 +397,4 @@ DEPENDENCIES
   test-kitchen
 
 BUNDLED WITH
-   1.14.6
+   1.16.4
diff --git a/pkgs/development/tools/chefdk/gemset.nix b/pkgs/development/tools/chefdk/gemset.nix
index d4e97deea8dc..228b3cd85135 100644
--- a/pkgs/development/tools/chefdk/gemset.nix
+++ b/pkgs/development/tools/chefdk/gemset.nix
@@ -791,10 +791,10 @@
   rack = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1kczgp2zwcrvp257dl8j4y3mnyqflxr7rn4vl9w1rwblznx9n74c";
+      sha256 = "1pcgv8dv4vkaczzlix8q3j68capwhk420cddzijwqgi2qb4lm1zm";
       type = "gem";
     };
-    version = "2.0.3";
+    version = "2.0.6";
   };
   rainbow = {
     dependencies = ["rake"];