diff --git a/FlagsmithClient/Classes/Internal/Router.swift b/FlagsmithClient/Classes/Internal/Router.swift
index 3fd7c85..bbdbcb8 100644
--- a/FlagsmithClient/Classes/Internal/Router.swift
+++ b/FlagsmithClient/Classes/Internal/Router.swift
@@ -11,6 +11,11 @@ import Foundation
 #endif
 
 enum Router: Sendable {
+    // x-release-please-start-version
+    private static let sdkVersion = "3.9.0"
+    // x-release-please-end
+    static let userAgent = "flagsmith-swift-ios-sdk/\(sdkVersion)"
+
     private enum HTTPMethod: String {
         case get = "GET"
         case post = "POST"
@@ -102,6 +107,7 @@ enum Router: Sendable {
         }
         request.addValue(apiKey, forHTTPHeaderField: "X-Environment-Key")
         request.addValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.addValue(Router.userAgent, forHTTPHeaderField: "User-Agent")
 
         return request
     }
diff --git a/FlagsmithClient/Classes/Internal/SSEManager.swift b/FlagsmithClient/Classes/Internal/SSEManager.swift
index b760aad..1af0b1d 100644
--- a/FlagsmithClient/Classes/Internal/SSEManager.swift
+++ b/FlagsmithClient/Classes/Internal/SSEManager.swift
@@ -157,6 +157,7 @@ final class SSEManager: NSObject, URLSessionDataDelegate, @unchecked Sendable {
         request.setValue("text/event-stream, application/json; charset=utf-8", forHTTPHeaderField: "Accept")
         request.setValue("no-cache", forHTTPHeaderField: "Cache-Control")
         request.setValue("keep-alive", forHTTPHeaderField: "Connection")
+        request.setValue(Router.userAgent, forHTTPHeaderField: "User-Agent")
 
         completionHandler = completion
         dataTask = session.dataTask(with: request)
diff --git a/FlagsmithClient/Tests/RouterTests.swift b/FlagsmithClient/Tests/RouterTests.swift
index 5b34ec5..b4211e8 100644
--- a/FlagsmithClient/Tests/RouterTests.swift
+++ b/FlagsmithClient/Tests/RouterTests.swift
@@ -20,6 +20,9 @@ final class RouterTests: FlagsmithClientTestCase {
         XCTAssertEqual(request.url?.absoluteString, "https://edge.api.flagsmith.com/api/v1/flags/")
         XCTAssertTrue(request.allHTTPHeaderFields?.contains(where: { $0.key == "X-Environment-Key" }) ?? false)
         XCTAssertNil(request.httpBody)
+        // x-release-please-start-version
+        XCTAssertEqual(request.allHTTPHeaderFields?["User-Agent"], "flagsmith-swift-ios-sdk/3.9.0")
+        // x-release-please-end
     }
 
     func testGetIdentityRequest() throws {
diff --git a/release-please-config.json b/release-please-config.json
index c015c5a..6ce0bae 100644
--- a/release-please-config.json
+++ b/release-please-config.json
@@ -10,7 +10,9 @@
             "prerelease": false,
             "include-component-in-tag": false,
             "extra-files": [
-                "FlagsmithClient.podspec"
+                "FlagsmithClient.podspec",
+                "FlagsmithClient/Classes/Internal/Router.swift",
+                "FlagsmithClient/Tests/RouterTests.swift"
             ]
         }
     },