diff --git a/README.md b/README.md
index 3c7f525..21b023d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,16 @@
 ## The Official Javascript & Typescript SDK for Fireblocks API
 [![npm version](https://badge.fury.io/js/fireblocks-sdk.svg)](https://badge.fury.io/js/fireblocks-sdk)
 
+> **⚠️ This package is deprecated.**
+>
+> `fireblocks-sdk` is deprecated and reaches **end-of-life on November 1, 2026** — no further updates or fixes will be released after that date.
+>
+> Existing installs continue to work, and this package will never be unpublished.
+>
+> Migrate to [`@fireblocks/ts-sdk`](https://www.npmjs.com/package/@fireblocks/ts-sdk) — see the [SDK Migration Guide](https://developers.fireblocks.com/reference/sdk-migration-guide).
+>
+> To silence the startup warning, set `FIREBLOCKS_SDK_SUPPRESS_DEPRECATION_WARNING=1`.
+
 > The current version of the SDK has changed the minimum supported Node.js version from v12 to v16.
 > 
 > Versions older than v16 are no longer maintained by the Node.js community and are considered EOL.
diff --git a/src/fireblocks-sdk.ts b/src/fireblocks-sdk.ts
index 138cb70..f9dee71 100644
--- a/src/fireblocks-sdk.ts
+++ b/src/fireblocks-sdk.ts
@@ -225,6 +225,11 @@ export interface SDKOptions {
 
 const DEFAULT_MAX_PAGE_SIZE = 100;
 
+const DEPRECATION_WARNING = "fireblocks-sdk is deprecated and reaches end-of-life on November 1, 2026: no further updates or fixes after that date. " +
+    "Existing installs continue to work. Migrate to @fireblocks/ts-sdk: https://developers.fireblocks.com/reference/sdk-migration-guide " +
+    "(set FIREBLOCKS_SDK_SUPPRESS_DEPRECATION_WARNING=1 to silence this warning)";
+let deprecationWarningShown = false;
+
 export class FireblocksSDK {
     private readonly authProvider: IAuthProvider;
     private readonly apiBaseUrl: string;
@@ -243,6 +248,11 @@ export class FireblocksSDK {
      * @param sdkOptions
      */
     constructor(privateKey: string, apiKey: string, apiBaseUrl: string = "https://api.fireblocks.io", authProvider: IAuthProvider = undefined, sdkOptions?: SDKOptions) {
+        if (!deprecationWarningShown && !process.env.FIREBLOCKS_SDK_SUPPRESS_DEPRECATION_WARNING) {
+            deprecationWarningShown = true;
+            console.warn(DEPRECATION_WARNING);
+        }
+
         this.authProvider = !!authProvider ? authProvider : new ApiTokenProvider(privateKey, apiKey);
 
         if (!!apiBaseUrl) {