diff --git a/RELEASE-NOTES-1.43 b/RELEASE-NOTES-1.43
index 653f399dad4..5cb87da9eff 100644
--- a/RELEASE-NOTES-1.43
+++ b/RELEASE-NOTES-1.43
@@ -128,6 +128,7 @@ For notes on 1.42.x and older releases, see HISTORY.
 
 * Updated codex, codex-design-tokens and codex-icons
   from v1.3.6 to v1.11.0.
+* Updated composer/semver from 3.4.0 to 3.4.2.
 * Updated guzzlehttp/guzzle from 7.7.1 to 7.8.1.
 * Updated jquery.i18n from 1.0.7 to 1.0.10.
 * Updated pear/net_smtp from 1.11.1 to 1.12.1.
diff --git a/composer.json b/composer.json
index 58101948458..e7af0ac9e32 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
 	},
 	"prefer-stable": true,
 	"require": {
-		"composer/semver": "3.4.0",
+		"composer/semver": "3.4.2",
 		"cssjanus/cssjanus": "2.3.0",
 		"ext-calendar": "*",
 		"ext-ctype": "*",