diff --git a/composer.lock b/composer.lock
index dcd9d0c93619..1c9f359c6710 100644
--- a/composer.lock
+++ b/composer.lock
@@ -3519,16 +3519,16 @@
         },
         {
             "name": "simplepie/simplepie",
-            "version": "1.5.6",
+            "version": "1.5.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/simplepie/simplepie.git",
-                "reference": "1c68e14ca3ac84346b6e6fe3c5eedf725d0f92c6"
+                "reference": "d1d80f37264c9f1ed7fa3434eca14d179cb689b1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/simplepie/simplepie/zipball/1c68e14ca3ac84346b6e6fe3c5eedf725d0f92c6",
-                "reference": "1c68e14ca3ac84346b6e6fe3c5eedf725d0f92c6",
+                "url": "https://api.github.com/repos/simplepie/simplepie/zipball/d1d80f37264c9f1ed7fa3434eca14d179cb689b1",
+                "reference": "d1d80f37264c9f1ed7fa3434eca14d179cb689b1",
                 "shasum": ""
             },
             "require": {
@@ -3538,7 +3538,7 @@
                 "php": ">=5.6.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~5.4.3 || ~6.5"
+                "yoast/phpunit-polyfills": "^1.0.1"
             },
             "suggest": {
                 "ext-curl": "",
@@ -3584,9 +3584,9 @@
             ],
             "support": {
                 "issues": "https://github.com/simplepie/simplepie/issues",
-                "source": "https://github.com/simplepie/simplepie/tree/1.5.6"
+                "source": "https://github.com/simplepie/simplepie/tree/1.5.8"
             },
-            "time": "2020-10-14T07:17:22+00:00"
+            "time": "2021-12-24T02:53:50+00:00"
         },
         {
             "name": "swaggest/json-diff",