diff --git a/.fern/metadata.json b/.fern/metadata.json
index b32890f..0eb4339 100644
--- a/.fern/metadata.json
+++ b/.fern/metadata.json
@@ -11,5 +11,5 @@
     "originGitCommitIsDirty": false,
     "invokedBy": "ci",
     "ciProvider": "github",
-    "sdkVersion": "4.0.0"
+    "sdkVersion": "4.0.1"
 }
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index e6f8775..cf533f2 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.0.0"
+  ".": "4.0.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e86d97f..e61ba60 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [4.0.1](https://github.com/Speechify-AI/sdk-typescript/compare/4.0.0...4.0.1) (2026-08-19)
+
+
+### Bug Fixes
+
+* align Fern-generated SDK version strings with published 4.0.0 ([#18](https://github.com/Speechify-AI/sdk-typescript/issues/18)) ([3b72093](https://github.com/Speechify-AI/sdk-typescript/commit/3b720932f1c88586d217f35d43b58d1191b923a2))
+
 ## [4.0.0](https://github.com/Speechify-AI/sdk-typescript/compare/3.0.1...4.0.0) (2026-08-19)
 
 
diff --git a/package.json b/package.json
index beff59d..a79ec02 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@speechify/api",
-    "version": "4.0.0",
+    "version": "4.0.1",
     "private": false,
     "repository": {
         "type": "git",
diff --git a/src/BaseClient.ts b/src/BaseClient.ts
index 56fc834..7b13813 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": "4.0.0",
-            "User-Agent": "@speechify/api/4.0.0",
+            "X-Fern-SDK-Version": "4.0.1",
+            "User-Agent": "@speechify/api/4.0.1",
             "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 c8a6ab3..45528ca 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const SDK_VERSION = "4.0.0";
+export const SDK_VERSION = "4.0.1";