diff --git a/Gemfile.lock b/Gemfile.lock
index c83ef6b9fd..283cddcf82 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -202,7 +202,7 @@ GEM
       railties (>= 7.0)
       responders
       warden (~> 1.2.3)
-    devise_invitable (2.0.13)
+    devise_invitable (2.0.14)
       actionmailer (>= 5.0)
       devise (>= 4.6)
     diff-lcs (1.6.2)
diff --git a/spec/lib/custom_devise_mailer_load_spec.rb b/spec/lib/custom_devise_mailer_load_spec.rb
new file mode 100644
index 0000000000..ad6fac4cec
--- /dev/null
+++ b/spec/lib/custom_devise_mailer_load_spec.rb
@@ -0,0 +1,16 @@
+require "open3"
+
+# Autoloading CustomDeviseMailer in a fresh process used to raise
+# "uninitialized constant CustomDeviseMailer" (#5745): devise_invitable 2.0.13's
+# :action_mailer load hook resolved Devise.mailer while the class was still loading
+# (fixed in 2.0.14, scambra/devise_invitable#929).
+# CI eager-loads, which hides it, so this boots a separate non-eager-loaded process.
+RSpec.describe "CustomDeviseMailer cold load" do
+  it "resolves Devise.mailer when autoloaded first in a fresh process" do
+    env = {"RAILS_ENV" => "test", "CI" => nil}
+    output, status = Open3.capture2e(env, "bin/rails", "runner", "puts Devise.mailer.name", chdir: Rails.root.to_s)
+
+    expect(status).to be_success, output
+    expect(output.lines.map(&:strip)).to include("CustomDeviseMailer")
+  end
+end