diff --git a/package-lock.json b/package-lock.json
index 328e797c06..879dba0577 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4244,6 +4244,14 @@
 						"tar-fs": "^2.0.0",
 						"unbzip2-stream": "^1.3.3",
 						"ws": "^7.2.3"
+					},
+					"dependencies": {
+						"@types/mime-types": {
+							"version": "2.1.0",
+							"resolved": "https://registry.npmjs.org/@types/mime-types/-/mime-types-2.1.0.tgz",
+							"integrity": "sha1-nKUs2jY/aZxpRmwqbM2q2RPqenM=",
+							"dev": true
+						}
 					}
 				},
 				"rimraf": {
@@ -5036,31 +5044,20 @@
 			"integrity": "sha1-S3KPrwoZVVGU1PvQVYL4M/3NE3s="
 		},
 		"autoprefixer": {
-			"version": "9.6.2",
-			"resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-9.6.2.tgz",
-			"integrity": "sha512-0hXVBruiJrTMJprJYwdWuIg87R8MJ/Yfrt85XgOgRwyC0mpBIyDdGZhSf+AEh6lAA+R/70Y+89G6YSXsCnnrEw==",
+			"version": "9.8.6",
+			"resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-9.8.6.tgz",
+			"integrity": "sha512-XrvP4VVHdRBCdX1S3WXVD8+RyG9qeb1D5Sn1DeLiG2xfSpzellk5k54xbUERJ3M5DggQxes39UGOTP8CFrEGbg==",
 			"dev": true,
 			"requires": {
-				"browserslist": "^4.7.0",
-				"caniuse-lite": "^1.0.30000998",
-				"chalk": "^2.4.2",
+				"browserslist": "^4.12.0",
+				"caniuse-lite": "^1.0.30001109",
+				"colorette": "^1.2.1",
 				"normalize-range": "^0.1.2",
 				"num2fraction": "^1.2.2",
-				"postcss": "^7.0.18",
-				"postcss-value-parser": "^4.0.2"
+				"postcss": "^7.0.32",
+				"postcss-value-parser": "^4.1.0"
 			},
 			"dependencies": {
-				"chalk": {
-					"version": "2.4.2",
-					"resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-					"integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-					"dev": true,
-					"requires": {
-						"ansi-styles": "^3.2.1",
-						"escape-string-regexp": "^1.0.5",
-						"supports-color": "^5.3.0"
-					}
-				},
 				"postcss-value-parser": {
 					"version": "4.1.0",
 					"resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-4.1.0.tgz",
diff --git a/package.json b/package.json
index 1c0db2b213..b87a47f9b0 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
 		"@wordpress/e2e-test-utils": "4.15.0",
 		"@wordpress/library-export-default-webpack-plugin": "1.9.0",
 		"@wordpress/scripts": "12.4.0",
-		"autoprefixer": "9.6.2",
+		"autoprefixer": "^9.8.6",
 		"chalk": "4.1.0",
 		"check-node-version": "4.0.3",
 		"copy-webpack-plugin": "^5.1.2",
diff --git a/src/wp-includes/css/admin-bar.css b/src/wp-includes/css/admin-bar.css
index f3e16d95d7..0ad0dcb198 100644
--- a/src/wp-includes/css/admin-bar.css
+++ b/src/wp-includes/css/admin-bar.css
@@ -969,6 +969,7 @@ html:lang(he-il) .rtl #wpadminbar * {
 		to 100% viewport width at responsive sizes. */
 	#wpadminbar .ab-top-menu > .menupop > .ab-sub-wrapper {
 		min-width: -webkit-fit-content;
+		min-width: -moz-fit-content;
 		min-width: fit-content;
 	}