diff --git a/lib/seam/routes/clients/user_identities.rb b/lib/seam/routes/clients/user_identities.rb
index 561a579..4059840 100644
--- a/lib/seam/routes/clients/user_identities.rb
+++ b/lib/seam/routes/clients/user_identities.rb
@@ -8,8 +8,8 @@ def initialize(client:, defaults:)
         @defaults = defaults
       end
 
-      def add_acs_user(acs_user_id:, user_identity_id:)
-        @client.post("/user_identities/add_acs_user", {acs_user_id: acs_user_id, user_identity_id: user_identity_id}.compact)
+      def add_acs_user(acs_user_id:, user_identity_id: nil, user_identity_key: nil)
+        @client.post("/user_identities/add_acs_user", {acs_user_id: acs_user_id, user_identity_id: user_identity_id, user_identity_key: user_identity_key}.compact)
 
         nil
       end
diff --git a/package-lock.json b/package-lock.json
index c5219d6..f01641f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,7 @@
       "devDependencies": {
         "@seamapi/fake-seam-connect": "1.85.0",
         "@seamapi/nextlove-sdk-generator": "^1.19.0",
-        "@seamapi/types": "1.573.0",
+        "@seamapi/types": "1.575.0",
         "del": "^7.1.0",
         "markdown-toc": "^1.2.0",
         "prettier": "^3.2.5"
@@ -476,9 +476,9 @@
       }
     },
     "node_modules/@seamapi/types": {
-      "version": "1.573.0",
-      "resolved": "https://registry.npmjs.org/@seamapi/types/-/types-1.573.0.tgz",
-      "integrity": "sha512-EAvQwslJCQy3DfWh5/3UHpp8xcpdvw/T9IGQuamzLA2edloN7H/WNyaoqyVgZEOVV+ROyQYFcdIPYL2FwuIfSQ==",
+      "version": "1.575.0",
+      "resolved": "https://registry.npmjs.org/@seamapi/types/-/types-1.575.0.tgz",
+      "integrity": "sha512-I0QT8L6xxBNK6DBDOPU0jxRSY20CVPZdr/6kbQbPXCnIzY6vs+ZAX9Kq9gMLF3Mu5MHE9+JgDImr5Qn+5A9mxw==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index c9dd955..abf4781 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "devDependencies": {
     "@seamapi/fake-seam-connect": "1.85.0",
     "@seamapi/nextlove-sdk-generator": "^1.19.0",
-    "@seamapi/types": "1.573.0",
+    "@seamapi/types": "1.575.0",
     "del": "^7.1.0",
     "markdown-toc": "^1.2.0",
     "prettier": "^3.2.5"