diff -Naur php-5.3.29_orig/ext/curl/interface.c php-5.3.29/ext/curl/interface.c
--- php-5.3.29_orig/ext/curl/interface.c	2014-08-14 01:22:50.000000000 +0600
+++ php-5.3.29/ext/curl/interface.c	2023-10-12 09:52:11.558952825 +0600
@@ -597,6 +597,16 @@
 	REGISTER_CURL_CONSTANT(CURLOPT_SSL_VERIFYHOST);
 	REGISTER_CURL_CONSTANT(CURLOPT_COOKIEFILE);
 	REGISTER_CURL_CONSTANT(CURLOPT_SSLVERSION);
+
+	/* Curl SSL Version constants (CURLOPT_SSLVERSION) */
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_DEFAULT);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_SSLv2);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_SSLv3);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1_0);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1_1);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1_2);
+
 	REGISTER_CURL_CONSTANT(CURLOPT_TIMECONDITION);
 	REGISTER_CURL_CONSTANT(CURLOPT_TIMEVALUE);
 	REGISTER_CURL_CONSTANT(CURLOPT_CUSTOMREQUEST);