diff --git a/package.json b/package.json
index cb77014..513201f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@authsignal/browser",
-  "version": "0.3.6",
+  "version": "0.3.7",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",
@@ -28,9 +28,9 @@
   },
   "dependencies": {
     "@fingerprintjs/fingerprintjs": "^3.3.6",
-    "@simplewebauthn/browser": "^8.2.1",
+    "@simplewebauthn/browser": "^9.0.1",
+    "@simplewebauthn/types": "^9.0.1",
     "a11y-dialog": "^7.5.2",
-    "ky": "^0.33.3",
     "uuid": "^9.0.0"
   },
   "devDependencies": {
diff --git a/src/api/passkey-api-client.ts b/src/api/passkey-api-client.ts
index 7b890a9..7d23068 100644
--- a/src/api/passkey-api-client.ts
+++ b/src/api/passkey-api-client.ts
@@ -1,5 +1,3 @@
-import ky from "ky";
-import {KyInstance} from "ky/distribution/types/ky";
 import {
   AddAuthenticatorRequest,
   AddAuthenticatorResponse,
@@ -18,56 +16,58 @@ type PasskeyApiClientOptions = {
 
 export class PasskeyApiClient {
   tenantId: string;
-  api: KyInstance;
+  baseUrl: string;
 
   constructor({baseUrl, tenantId}: PasskeyApiClientOptions) {
     this.tenantId = tenantId;
-
-    this.api = ky.create({
-      prefixUrl: baseUrl,
-    });
+    this.baseUrl = baseUrl;
   }
 
   async registrationOptions({token, userName}: RegistrationOptsRequest): Promise<RegistrationOptsResponse> {
-    const response = await this.api.post("client/user-authenticators/passkey/registration-options", {
-      json: {username: userName},
+    const request = fetch(`${this.baseUrl}/client/user-authenticators/passkey/registration-options`, {
+      method: "POST",
       headers: this.buildHeaders(token),
+      body: JSON.stringify({username: userName}),
     });
 
-    return response.json();
+    return (await request).json();
   }
 
   async authenticationOptions({token}: AuthenticationOptsRequest): Promise<AuthenticationOptsResponse> {
-    const response = await this.api.post("client/user-authenticators/passkey/authentication-options", {
-      json: {},
+    const request = fetch(`${this.baseUrl}/client/user-authenticators/passkey/authentication-options`, {
+      method: "POST",
       headers: this.buildHeaders(token),
+      body: JSON.stringify({}),
     });
 
-    return response.json();
+    return (await request).json();
   }
 
   async addAuthenticator({token, ...rest}: AddAuthenticatorRequest): Promise<AddAuthenticatorResponse> {
-    const response = await this.api.post("client/user-authenticators/passkey", {
-      json: rest,
+    const request = fetch(`${this.baseUrl}/client/user-authenticators/passkey`, {
+      method: "POST",
       headers: this.buildHeaders(token),
+      body: JSON.stringify(rest),
     });
 
-    return response.json();
+    return (await request).json();
   }
 
   async verify({token, ...rest}: VerifyRequest): Promise<VerifyResponse> {
-    const response = await this.api.post("client/verify/passkey", {
-      json: rest,
+    const request = fetch(`${this.baseUrl}/client/verify/passkey`, {
+      method: "POST",
       headers: this.buildHeaders(token),
+      body: JSON.stringify(rest),
     });
 
-    return response.json();
+    return (await request).json();
   }
 
   private buildHeaders(token?: string) {
     const authorizationHeader = token ? `Bearer ${token}` : `Basic ${window.btoa(encodeURIComponent(this.tenantId))}`;
 
     return {
+      "Content-Type": "application/json",
       Authorization: authorizationHeader,
     };
   }
diff --git a/src/api/types.ts b/src/api/types.ts
index a6ee2c4..d4f0b0e 100644
--- a/src/api/types.ts
+++ b/src/api/types.ts
@@ -2,7 +2,7 @@ import {
   AuthenticationResponseJSON,
   PublicKeyCredentialCreationOptionsJSON,
   RegistrationResponseJSON,
-} from "@simplewebauthn/typescript-types";
+} from "@simplewebauthn/types";
 
 export type RegistrationOptsRequest = {
   userName?: string;
diff --git a/src/authsignal.ts b/src/authsignal.ts
index 6abe227..6746026 100644
--- a/src/authsignal.ts
+++ b/src/authsignal.ts
@@ -76,9 +76,11 @@ export class Authsignal {
     }
   }
 
-  initAdvancedProfiling(baseUrl?: string): undefined {
+  initAdvancedProfiling(baseUrl?: string) {
     const profilingId = uuidv4();
+
     this.profilingId = profilingId;
+
     setCookie({
       name: DEFAULT_PROFILING_COOKIE_NAME,
       value: profilingId,
diff --git a/yarn.lock b/yarn.lock
index a728084..0228124 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -152,12 +152,17 @@
     estree-walker "^1.0.1"
     picomatch "^2.2.2"
 
-"@simplewebauthn/browser@^8.2.1":
-  version "8.2.1"
-  resolved "https://registry.npmjs.org/@simplewebauthn/browser/-/browser-8.2.1.tgz#feb9f9553dd10e5e4349d58753e5c3bf8bf52957"
-  integrity sha512-s8A2ADEpULrPcKBbewzWECgyUe4sOu06OwBN4UzSO5PmBj4TG9nXaz+Ihy7ZT8eK6lF+lPy/tKebfjc/7dY2HA==
+"@simplewebauthn/browser@^9.0.1":
+  version "9.0.1"
+  resolved "https://registry.npmjs.org/@simplewebauthn/browser/-/browser-9.0.1.tgz#46a12c2bcefcb199f7fcb6a7e883531cd6efde17"
+  integrity sha512-wD2WpbkaEP4170s13/HUxPcAV5y4ZXaKo1TfNklS5zDefPinIgXOpgz1kpEvobAsaLPa2KeH7AKKX/od1mrBJw==
   dependencies:
-    "@simplewebauthn/typescript-types" "^8.0.0"
+    "@simplewebauthn/types" "^9.0.1"
+
+"@simplewebauthn/types@^9.0.1":
+  version "9.0.1"
+  resolved "https://registry.npmjs.org/@simplewebauthn/types/-/types-9.0.1.tgz#3a68d50e63d8821cf2067de3324c68d5e8120d0c"
+  integrity sha512-tGSRP1QvsAvsJmnOlRQyw/mvK9gnPtjEc5fg2+m8n+QUa+D7rvrKkOYyfpy42GTs90X3RDOnqJgfHt+qO67/+w==
 
 "@simplewebauthn/typescript-types@^8.0.0":
   version "8.0.0"
@@ -822,11 +827,6 @@ json-stable-stringify-without-jsonify@^1.0.1:
   resolved "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz#9db7b59496ad3f3cfef30a75142d2d930ad72651"
   integrity sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw==
 
-ky@^0.33.3:
-  version "0.33.3"
-  resolved "https://registry.npmjs.org/ky/-/ky-0.33.3.tgz#bf1ad322a3f2c3428c13cfa4b3af95e6c4a2f543"
-  integrity sha512-CasD9OCEQSFIam2U8efFK81Yeg8vNMTBUqtMOHlrcWQHqUX3HeCl9Dr31u4toV7emlH8Mymk5+9p0lL6mKb/Xw==
-
 levn@^0.4.1:
   version "0.4.1"
   resolved "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz#ae4562c007473b932a6200d403268dd2fffc6ade"