diff --git a/NEWS b/NEWS
index ab95aab660b..63c1e54b05b 100644
--- a/NEWS
+++ b/NEWS
@@ -33,6 +33,9 @@ Phar:
   . Fixed bug GH-12532 (PharData created from zip has incorrect timestamp).
     (nielsdos)
 
+POSIX:
+  . Added POSIX_SC_CHILD_MAX and POSIX_SC_CLK_TCK constants. (Jakub Zelenka)
+
 SimpleXML:
   . Fixed bug GH-12192 (SimpleXML infinite loop when getName() is called
     within foreach). (nielsdos)
diff --git a/UPGRADING b/UPGRADING
index c0f1771eb8a..15ab6b78a92 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -108,6 +108,10 @@ PHP 8.4 UPGRADE NOTES
 - Phar:
   . Added support for the unix timestamp extension for zip archives.
 
+- POSIX:
+  . Added constant POSIX_SC_CHILD_MAX
+  . Added constant POSIX_SC_CLK_TCK
+
 - SOAP:
   . Added support for clark notation for namespaces in class map.
     It is now possible to specify entries in a class map with clark notation
diff --git a/ext/posix/posix.stub.php b/ext/posix/posix.stub.php
index 4e5adc2eef9..904635f67f3 100644
--- a/ext/posix/posix.stub.php
+++ b/ext/posix/posix.stub.php
@@ -198,6 +198,20 @@ const POSIX_RLIMIT_INFINITY = UNKNOWN;
  */
 const POSIX_SC_ARG_MAX = UNKNOWN;
 #endif
+#ifdef _SC_CHILD_MAX
+/**
+ * @var int
+ * @cvalue _SC_CHILD_MAX
+ */
+const POSIX_SC_CHILD_MAX = UNKNOWN;
+#endif
+#ifdef _SC_CLK_TCK
+/**
+ * @var int
+ * @cvalue _SC_CLK_TCK
+ */
+const POSIX_SC_CLK_TCK = UNKNOWN;
+#endif
 #ifdef _SC_PAGESIZE
 /**
  * @var int
diff --git a/ext/posix/posix_arginfo.h b/ext/posix/posix_arginfo.h
index 2953e93fcdd..717de3a844f 100644
--- a/ext/posix/posix_arginfo.h
+++ b/ext/posix/posix_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 5a4a863892761475f2d34d9463e0660b0a8ede5d */
+ * Stub hash: bf0c3b394a47374357d6ac95b4c401fbcf7bc697 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_posix_kill, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, process_id, IS_LONG, 0)
@@ -418,6 +418,12 @@ static void register_posix_symbols(int module_number)
 #if defined(_SC_ARG_MAX)
 	REGISTER_LONG_CONSTANT("POSIX_SC_ARG_MAX", _SC_ARG_MAX, CONST_PERSISTENT);
 #endif
+#if defined(_SC_CHILD_MAX)
+	REGISTER_LONG_CONSTANT("POSIX_SC_CHILD_MAX", _SC_CHILD_MAX, CONST_PERSISTENT);
+#endif
+#if defined(_SC_CLK_TCK)
+	REGISTER_LONG_CONSTANT("POSIX_SC_CLK_TCK", _SC_CLK_TCK, CONST_PERSISTENT);
+#endif
 #if defined(_SC_PAGESIZE)
 	REGISTER_LONG_CONSTANT("POSIX_SC_PAGESIZE", _SC_PAGESIZE, CONST_PERSISTENT);
 #endif