diff --git a/composer.lock b/composer.lock
index 3d1f78d1f5..d60420ff11 100644
--- a/composer.lock
+++ b/composer.lock
@@ -2394,20 +2394,20 @@
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.18.1",
+            "version": "v1.20.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "a6977d63bf9a0ad4c65cd352709e230876f9904a"
+                "reference": "39d483bdf39be819deabf04ec872eb0b2410b531"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/a6977d63bf9a0ad4c65cd352709e230876f9904a",
-                "reference": "a6977d63bf9a0ad4c65cd352709e230876f9904a",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/39d483bdf39be819deabf04ec872eb0b2410b531",
+                "reference": "39d483bdf39be819deabf04ec872eb0b2410b531",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": ">=7.1"
             },
             "suggest": {
                 "ext-mbstring": "For best performance"
@@ -2415,7 +2415,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.18-dev"
+                    "dev-main": "1.20-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -2467,7 +2467,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-07-14T12:35:20+00:00"
+            "time": "2020-10-23T14:02:19+00:00"
         },
         {
             "name": "symfony/polyfill-php73",