diff --git a/ChangeLog b/ChangeLog
index 62da5c3c..01798920 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+11/22/2023
+- populate User-Agent header in outgoing HTTP requests with mod_auth_openidc, libcurl and OpenSSL
+  version information and log it for debugging purposes
+- bump to 2.4.15rc5
+
 11/08/2023
 - improve error message in case of curl timeouts
 - bump to 2.4.15rc4
diff --git a/configure.ac b/configure.ac
index 2dc82613..45f6b7d1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([mod_auth_openidc],[2.4.15rc4],[hans.zandbelt@openidc.com])
+AC_INIT([mod_auth_openidc],[2.4.15rc5],[hans.zandbelt@openidc.com])
 
 AC_SUBST(NAMEVER, AC_PACKAGE_TARNAME()-AC_PACKAGE_VERSION())
 
diff --git a/src/util.c b/src/util.c
index d6ba5e32..631bd7f0 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1141,7 +1141,10 @@ static apr_byte_t oidc_util_http_call(request_rec *r, const char *url,
 #endif
 
 	/* identify this HTTP client */
-	curl_easy_setopt(curl, CURLOPT_USERAGENT, "mod_auth_openidc");
+	char *useragent = apr_psprintf(r->pool, "%s libcurl-%s %s", NAMEVERSION,
+			LIBCURL_VERSION, OPENSSL_VERSION_TEXT);
+	oidc_debug(r, "set HTTP request header User-Agent to: %s", useragent);
+	curl_easy_setopt(curl, CURLOPT_USERAGENT, useragent);
 
 	/* set optional outgoing proxy for the local network */
 	if (outgoing_proxy->host_port) {