diff --git a/.gitignore b/.gitignore
index da50063b3..1a2f62b6e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,4 @@ public/uploads
 docker-compose.override.yml
 *~undo-tree~
 .DS_Store
+/bundler.d/
diff --git a/Gemfile b/Gemfile
index 469cfc47a..70ab80614 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,14 @@
 # frozen_string_literal: true
 
+# for knapsack overrides of gems. See https://github.com/ManageIQ/bundler-inject
+# set BUNDLE_BUNDLER_INJECT__GEM_PATH in your knapsack to point at the knapsack override file.
+plugin 'bundler-inject'
+begin
+  require File.join(Bundler::Plugin.index.load_paths("bundler-inject")[0], "bundler-inject")
+rescue
+  nil
+end
+
 # rubocop:disable Layout/LineLength
 source 'https://rubygems.org'
 
diff --git a/bundler.d/.gitkeep b/bundler.d/.gitkeep
new file mode 100644
index 000000000..e69de29bb