diff --git a/composer.json b/composer.json
index 4cd14415597c7..c636b2e7e680f 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 		"ext-dom": "*"
 	},
 	"require-dev": {
-		"composer/ca-bundle": "1.5.8",
+		"composer/ca-bundle": "1.5.9",
 		"squizlabs/php_codesniffer": "3.13.2",
 		"wp-coding-standards/wpcs": "~3.2.0",
 		"phpcompatibility/phpcompatibility-wp": "~2.1.3",