diff --git a/CHANGELOG.md b/CHANGELOG.md
index b205591fb..4785e41e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Fixed
 - [#935](https://github.com/Shopify/shopify_api/pull/935) Fix issue [#931](https://github.com/Shopify/shopify_api/pull/931), weight of variant should be float
+- [#939](https://github.com/Shopify/shopify_api/pull/939) Hotfix for `.spin.dev` JWT validation.
 
 ## Version 10.0.2
 
diff --git a/Rakefile b/Rakefile
index 1f7b52571..5645dcec2 100644
--- a/Rakefile
+++ b/Rakefile
@@ -11,7 +11,7 @@ namespace :test do
 
   Rake::TestTask.new(:rest_wrappers) do |t|
     pattern = if ENV.key?("API_VERSION")
-      "test/rest/**/#{ENV["API_VERSION"]}/*.rb"
+      "test/rest/**/#{ENV.fetch("API_VERSION")}/*.rb"
     else
       "test/rest/**/*.rb"
     end