diff --git a/lib/ahoy_email/engine.rb b/lib/ahoy_email/engine.rb
index 33e3dd5..09032fa 100644
--- a/lib/ahoy_email/engine.rb
+++ b/lib/ahoy_email/engine.rb
@@ -2,8 +2,10 @@
 
 module AhoyEmail
   class Engine < ::Rails::Engine
-    initializer "ahoy_email" do |app|
-      AhoyEmail.secret_token ||= app.key_generator.generate_key("ahoy_email")
+    initializer "ahoy_email", after: :load_config_initializers do |app|
+      app.config.after_initialize do
+        AhoyEmail.secret_token ||= app.key_generator.generate_key("ahoy_email")
+      end
     end
   end
 end
diff --git a/test/click_test.rb b/test/click_test.rb
index 3c26ca4..32e320c 100644
--- a/test/click_test.rb
+++ b/test/click_test.rb
@@ -47,7 +47,7 @@ def test_invalid_redirect_url
   end
 
   def test_consistent_signature
-    get AhoyEmail::Engine.routes.url_helpers.click_path(c: "test", s: "1xjjEyEbkRSohoe0RpWUYAeDNthXDDNdaKFtCJp5lyg", t: "123", u: "https://example.org")
+    get AhoyEmail::Engine.routes.url_helpers.click_path(c: "test", s: "AgVw_k8ckEXXHdlG0OZ8raH0OVir3LYAivnV3E0HRZU", t: "123", u: "https://example.org")
     assert_redirected_to "https://example.org"
   end
 
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 7e01d5c..c30c8f4 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -21,12 +21,14 @@ def mongoid?
     config.secret_key_base = "0" * 128
     config.autoload_paths << File.expand_path("support/mongoid_models", __dir__)
     config.logger = $logger
+    config.active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA256
   end
 else
   Combustion.initialize! :action_mailer, :action_controller, :active_record do
     config.load_defaults Rails::VERSION::STRING.to_f
     config.secret_key_base = "0" * 128
     config.logger = $logger
+    config.active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA256
   end
 end
 
diff --git a/test/token_test.rb b/test/token_test.rb
index 7e5e2d8..958d479 100644
--- a/test/token_test.rb
+++ b/test/token_test.rb
@@ -3,7 +3,12 @@
 class TokenTest < Minitest::Test
   def test_secret_token
     # ensure consistent across Rails releases
-    expected = "0baf04b17695d9934775733e6941fcc0f024c68ee98d539dc0c214823fa0e255708ac74a4957cb561ddd8a63af9a24e1d255259d95306734fb513e5e7cbb897d"
+    expected = "7f6a02c3632c8f46c90886517bc28c9bb67fc5634afa109cdb1e385592b9b91023bf4de7e2d074a8cd24c1ac0299d1b05837474212ec0cb104ec18659d71490b"
     assert_equal expected, AhoyEmail.secret_token.unpack1("h*")
   end
+
+  def test_digest_class
+    digest_class = Combustion::Application.key_generator.instance_variable_get(:@key_generator).instance_variable_get(:@hash_digest_class)
+    assert_equal OpenSSL::Digest::SHA256, digest_class, "Digest class is different from what is configured in the Combustion application"
+  end
 end