diff --git a/lib/jsonapi_compliable/configuration.rb b/lib/jsonapi_compliable/configuration.rb
index 27c61e4..9c8c9c7 100644
--- a/lib/jsonapi_compliable/configuration.rb
+++ b/lib/jsonapi_compliable/configuration.rb
@@ -19,6 +19,8 @@ def initialize
     def experimental_concurrency=(val)
       if val && !defined?(Concurrent::Promise)
         raise "You must add the concurrent-ruby gem to opt-in to experimental concurrency"
+      else
+        @experimental_concurrency = val
       end
     end
   end
diff --git a/lib/jsonapi_compliable/version.rb b/lib/jsonapi_compliable/version.rb
index 28cf2d4..b7a17a5 100644
--- a/lib/jsonapi_compliable/version.rb
+++ b/lib/jsonapi_compliable/version.rb
@@ -1,3 +1,3 @@
 module JsonapiCompliable
-  VERSION = "0.11.18"
+  VERSION = "0.11.19"
 end