diff --git a/src/BaseClient.ts b/src/BaseClient.ts
index 2d206f1..56fc834 100644
--- a/src/BaseClient.ts
+++ b/src/BaseClient.ts
@@ -63,8 +63,8 @@ export function normalizeClientOptions<T extends BaseClientOptions = BaseClientO
         {
             "X-Fern-Language": "JavaScript",
             "X-Fern-SDK-Name": "@speechify/api",
-            "X-Fern-SDK-Version": "3.0.2",
-            "User-Agent": "@speechify/api/3.0.2",
+            "X-Fern-SDK-Version": "4.0.0",
+            "User-Agent": "@speechify/api/4.0.0",
             "X-Fern-Runtime": core.RUNTIME.type,
             "X-Fern-Runtime-Version": core.RUNTIME.version,
             "Speechify-Version": options?.version ?? "2026-09-13",
diff --git a/src/version.ts b/src/version.ts
index af16f12..c8a6ab3 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const SDK_VERSION = "3.0.2";
+export const SDK_VERSION = "4.0.0";