diff --git a/NEWS b/NEWS
index d9760d08f64..dfea4ff1a3c 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,10 @@ PHP                                                                        NEWS
     As such, passing invalid types to exit/die may now result in a TypeError
     being thrown. (Girgias)
 
+- CURL:
+  . Added CURLOPT_TCP_KEEPCNT to set the number of probes to send before
+    dropping the connection. (David Carlier)
+
 - Hash:
   . Fix GH-15384 (Build fails on Alpine / Musl for amd64). (timwolla)
 
diff --git a/UPGRADING b/UPGRADING
index c6dd6f0b103..6a56342a85e 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -917,6 +917,7 @@ PHP 8.4 UPGRADE NOTES
 - Curl:
   . CURL_HTTP_VERSION_3.
   . CURL_HTTP_VERSION_3ONLY.
+  . CURL_TCP_KEEPCNT
 
 - Intl:
   . The IntlDateFormatter class exposes now the new PATTERN constant
diff --git a/ext/curl/curl.stub.php b/ext/curl/curl.stub.php
index 0adfb17c4d3..473e8b6297e 100644
--- a/ext/curl/curl.stub.php
+++ b/ext/curl/curl.stub.php
@@ -407,6 +407,13 @@ const CURLOPT_SSL_VERIFYPEER = UNKNOWN;
  * @cvalue CURLOPT_STDERR
  */
 const CURLOPT_STDERR = UNKNOWN;
+#if LIBCURL_VERSION_NUM >= 0x080900 /* Available since 8.9.0 */
+/**
+ * @var int
+ * @cvalue CURLOPT_TCP_KEEPCNT
+ */
+const CURLOPT_TCP_KEEPCNT = UNKNOWN;
+#endif
 /**
  * @var int
  * @cvalue CURLOPT_TELNETOPTIONS
diff --git a/ext/curl/curl_arginfo.h b/ext/curl/curl_arginfo.h
index 044763d57df..3bb825af8d1 100644
--- a/ext/curl/curl_arginfo.h
+++ b/ext/curl/curl_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: b5a3bd62bcb62b2e7e4aacfcd4621cc632be1564 */
+ * Stub hash: ddfcdd8a0bf0ee6c338ec1689c6de5d7fd87303d */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_curl_close, 0, 1, IS_VOID, 0)
 	ZEND_ARG_OBJ_INFO(0, handle, CurlHandle, 0)
@@ -307,6 +307,9 @@ static void register_curl_symbols(int module_number)
 	REGISTER_LONG_CONSTANT("CURLOPT_SSL_VERIFYHOST", CURLOPT_SSL_VERIFYHOST, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CURLOPT_SSL_VERIFYPEER", CURLOPT_SSL_VERIFYPEER, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CURLOPT_STDERR", CURLOPT_STDERR, CONST_PERSISTENT);
+#if LIBCURL_VERSION_NUM >= 0x080900 /* Available since 8.9.0 */
+	REGISTER_LONG_CONSTANT("CURLOPT_TCP_KEEPCNT", CURLOPT_TCP_KEEPCNT, CONST_PERSISTENT);
+#endif
 	REGISTER_LONG_CONSTANT("CURLOPT_TELNETOPTIONS", CURLOPT_TELNETOPTIONS, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CURLOPT_TIMECONDITION", CURLOPT_TIMECONDITION, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CURLOPT_TIMEOUT", CURLOPT_TIMEOUT, CONST_PERSISTENT);
diff --git a/ext/curl/interface.c b/ext/curl/interface.c
index 994bac82f38..8ec2ec33520 100644
--- a/ext/curl/interface.c
+++ b/ext/curl/interface.c
@@ -1728,6 +1728,9 @@ static zend_result _php_curl_setopt(php_curl *ch, zend_long option, zval *zvalue
 #if LIBCURL_VERSION_NUM >= 0x075700 /* Available since 7.87.0 */
 		case CURLOPT_CA_CACHE_TIMEOUT:
 		case CURLOPT_QUICK_EXIT:
+#endif
+#if LIBCURL_VERSION_NUM >= 0x080900 /* Available since 8.9.0 */
+		case CURLOPT_TCP_KEEPCNT:
 #endif
 			lval = zval_get_long(zvalue);
 			if ((option == CURLOPT_PROTOCOLS || option == CURLOPT_REDIR_PROTOCOLS) &&