diff --git a/UPGRADING b/UPGRADING
index fbb536dd6bb..4425123898c 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -337,6 +337,12 @@ PHP 8.1 UPGRADE NOTES
     favor of date_sun_info().
     RFC: https://wiki.php.net/rfc/deprecations_php_8_1
 
+- Hash:
+  . The mhash(), mhash_keygen_s2k(), mhash_count(), mhash_get_block_size() and
+    mhash_get_hash_name() functions are deprecated. Use the hash_*() APIs
+    instead.
+    RFC: https://wiki.php.net/rfc/deprecations_php_8_1
+
 - Intl:
   . Calling IntlCalendar::roll() with bool argument is deprecated. Pass 1 and -1
     instead of true and false respectively.
diff --git a/ext/hash/hash.stub.php b/ext/hash/hash.stub.php
index c59fdfa64f9..953092d8411 100644
--- a/ext/hash/hash.stub.php
+++ b/ext/hash/hash.stub.php
@@ -34,14 +34,19 @@ function hash_equals(string $known_string, string $user_string): bool {}
 function hash_hkdf(string $algo, string $key, int $length = 0, string $info = "", string $salt = ""): string {}
 
 #ifdef PHP_MHASH_BC
+/** @deprecated */
 function mhash_get_block_size(int $algo): int|false {}
 
+/** @deprecated */
 function mhash_get_hash_name(int $algo): string|false {}
 
+/** @deprecated */
 function mhash_keygen_s2k(int $algo, string $password, string $salt, int $length): string|false {}
 
+/** @deprecated */
 function mhash_count(): int {}
 
+/** @deprecated */
 function mhash(int $algo, string $data, ?string $key = null): string|false {}
 #endif
 
diff --git a/ext/hash/hash_arginfo.h b/ext/hash/hash_arginfo.h
index f6ba16d4c44..1b780f6a86e 100644
--- a/ext/hash/hash_arginfo.h
+++ b/ext/hash/hash_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 3973a03a64b0939de0c3677da55a5104c29b1b99 */
+ * Stub hash: 8c35168fb1c95e76c5c77fd0c0e8d295e13a0414 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_hash, 0, 2, MAY_BE_STRING|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, algo, IS_STRING, 0)
@@ -180,19 +180,19 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_FE(hash_equals, arginfo_hash_equals)
 	ZEND_FE(hash_hkdf, arginfo_hash_hkdf)
 #if defined(PHP_MHASH_BC)
-	ZEND_FE(mhash_get_block_size, arginfo_mhash_get_block_size)
+	ZEND_DEP_FE(mhash_get_block_size, arginfo_mhash_get_block_size)
 #endif
 #if defined(PHP_MHASH_BC)
-	ZEND_FE(mhash_get_hash_name, arginfo_mhash_get_hash_name)
+	ZEND_DEP_FE(mhash_get_hash_name, arginfo_mhash_get_hash_name)
 #endif
 #if defined(PHP_MHASH_BC)
-	ZEND_FE(mhash_keygen_s2k, arginfo_mhash_keygen_s2k)
+	ZEND_DEP_FE(mhash_keygen_s2k, arginfo_mhash_keygen_s2k)
 #endif
 #if defined(PHP_MHASH_BC)
-	ZEND_FE(mhash_count, arginfo_mhash_count)
+	ZEND_DEP_FE(mhash_count, arginfo_mhash_count)
 #endif
 #if defined(PHP_MHASH_BC)
-	ZEND_FE(mhash, arginfo_mhash)
+	ZEND_DEP_FE(mhash, arginfo_mhash)
 #endif
 	ZEND_FE_END
 };
diff --git a/ext/hash/tests/mhash_001.phpt b/ext/hash/tests/mhash_001.phpt
index b61bab64946..3aeff4a21d0 100644
--- a/ext/hash/tests/mhash_001.phpt
+++ b/ext/hash/tests/mhash_001.phpt
@@ -34,36 +34,57 @@ foreach ($supported_hash_al as $hash=>$wanted) {
     echo "\n";
 }
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_MD5
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_SHA1
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_HAVAL256
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_HAVAL192
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_HAVAL224
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_HAVAL160
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_RIPEMD160
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_GOST
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_TIGER
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_CRC32
 ok
 
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 MHASH_CRC32B
 ok
diff --git a/ext/hash/tests/mhash_002.phpt b/ext/hash/tests/mhash_002.phpt
index fdf886a71e7..bfe88bdd2be 100644
--- a/ext/hash/tests/mhash_002.phpt
+++ b/ext/hash/tests/mhash_002.phpt
@@ -2,6 +2,8 @@
 MHash: mhash_get_block_size() & mhash_get_hash_name() test
 --SKIPIF--
 <?php if(!function_exists('mhash')) { die('skip mhash compatibility layer not available'); } ?>
+--INI--
+error_reporting=E_ALL&~E_DEPRECATED
 --FILE--
 <?php
 $supported_hash_al = array(
diff --git a/ext/hash/tests/mhash_003.phpt b/ext/hash/tests/mhash_003.phpt
index 99436b9ece9..4af9545709f 100644
--- a/ext/hash/tests/mhash_003.phpt
+++ b/ext/hash/tests/mhash_003.phpt
@@ -34,36 +34,57 @@ foreach ($supported_hash_al as $hash=>$wanted) {
     echo "\n";
 }
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_MD5
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_SHA1
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_HAVAL256
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_HAVAL224
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_HAVAL192
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_HAVAL160
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_RIPEMD160
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_GOST
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_TIGER
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_CRC32
 ok
 
+
+Deprecated: Function mhash_keygen_s2k() is deprecated in %s on line %d
 MHASH_CRC32B
 ok
diff --git a/ext/hash/tests/mhash_004.phpt b/ext/hash/tests/mhash_004.phpt
index f3c5e34ee38..91e9d147ced 100644
--- a/ext/hash/tests/mhash_004.phpt
+++ b/ext/hash/tests/mhash_004.phpt
@@ -11,7 +11,9 @@ var_dump(bin2hex(mhash($algo, "test")));
 var_dump($algo);
 
 ?>
---EXPECT--
+--EXPECTF--
 int(1)
+
+Deprecated: Function mhash() is deprecated in %s on line %d
 string(32) "098f6bcd4621d373cade4e832627b4f6"
 int(1)