diff --git a/.gitignore b/.gitignore
index acf988c0..78408cdb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,6 @@ buck-out/
 android/app/libs
 android/keystores/debug.keystore
 *.js.map
+
+# Utils
+utils/version.ts
diff --git a/flagsmith-core.ts b/flagsmith-core.ts
index 9f8d0cef..a7db5334 100644
--- a/flagsmith-core.ts
+++ b/flagsmith-core.ts
@@ -25,6 +25,7 @@ import setDynatraceValue from './utils/set-dynatrace-value';
 import { EvaluationContext } from './evaluation-context';
 import { isTraitEvaluationContext, toEvaluationContext, toTraitEvaluationContextObject } from './utils/types';
 import { ensureTrailingSlash } from './utils/ensureTrailingSlash';
+import { SDK_VERSION } from './utils/version';
 
 enum FlagSource {
     "NONE" = "NONE",
@@ -828,6 +829,10 @@ const Flagsmith = class {
             options.headers['Flagsmith-Application-Version'] = this.applicationMetadata.version;
         }
 
+        if (SDK_VERSION) {
+            options.headers['Flagsmith-SDK-user-agent'] = `flagsmith-js-sdk/${SDK_VERSION}`
+        }
+
         if (headers) {
             Object.assign(options.headers, headers);
         }
diff --git a/lib/flagsmith/package.json b/lib/flagsmith/package.json
index bacae0e1..a95a398e 100644
--- a/lib/flagsmith/package.json
+++ b/lib/flagsmith/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flagsmith",
-  "version": "9.3.0",
+  "version": "9.3.1",
   "description": "Feature flagging to support continuous development",
   "main": "./index.js",
   "module": "./index.mjs",
diff --git a/package.json b/package.json
index 8a1838ba..80e33790 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "main": "./flagsmith/index.js",
   "scripts": {
     "typecheck": "tsc",
-    "build": "npm run generatetypes && npm run bundle && npm run typecheck",
+    "prebuild": "node scripts/write-version.js",
+    "build": "npm run prebuild && npm run bundle && npm run typecheck",
     "bundle": "rollup -c && node ./move-react.js",
     "deploy": "npm run build && npm test && cd ./lib/flagsmith/ && npm publish && cd ../../lib/react-native-flagsmith && npm publish",
     "deploy:beta": "npm run build && npm test && cd ./lib/flagsmith/ && npm publish --tag beta && cd ../../lib/react-native-flagsmith && npm publish --tag beta",
diff --git a/scripts/write-version.js b/scripts/write-version.js
new file mode 100644
index 00000000..b1483a76
--- /dev/null
+++ b/scripts/write-version.js
@@ -0,0 +1,10 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const fs = require('fs');
+const path = require('path');
+const pkg = require('../lib/flagsmith/package.json');
+
+const content = `// Auto-generated by write-version.js
+export const SDK_VERSION = "${pkg.version}";
+`;
+
+fs.writeFileSync(path.join(__dirname, '../utils/version.ts'), content);
diff --git a/test/init.test.ts b/test/init.test.ts
index 4b162c89..6d9d66eb 100644
--- a/test/init.test.ts
+++ b/test/init.test.ts
@@ -1,7 +1,7 @@
 import { waitFor } from '@testing-library/react';
 import {defaultState, FLAGSMITH_KEY, getFlagsmith, getStateToCheck, identityState} from './test-constants';
 import { promises as fs } from 'fs';
-
+import { SDK_VERSION } from '../utils/version'
 describe('Flagsmith.init', () => {
     beforeEach(() => {
         // Avoid mocks, but if you need to add them here
@@ -292,6 +292,7 @@ describe('Flagsmith.init', () => {
                 headers: expect.objectContaining({
                     'Flagsmith-Application-Name': 'Test App',
                     'Flagsmith-Application-Version': '1.2.3',
+                    'Flagsmith-SDK-user-agent': `flagsmith-js-sdk/${SDK_VERSION}`,
                 }),
             }),
         );
diff --git a/utils/version.ts b/utils/version.ts
new file mode 100644
index 00000000..f34f5479
--- /dev/null
+++ b/utils/version.ts
@@ -0,0 +1,2 @@
+// Auto-generated by write-version.js
+export const SDK_VERSION = "9.3.1";