diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index bb5ad2a7ee..85163dc324 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -35,7 +35,7 @@
     "@tryghost/mobiledoc-kit": "0.11.2-ghost.4",
     "@tryghost/string": "0.1.5",
     "@tryghost/timezone-data": "0.2.10",
-    "autoprefixer": "9.6.1",
+    "autoprefixer": "9.6.4",
     "blueimp-md5": "2.12.0",
     "broccoli-asset-rev": "3.0.0",
     "broccoli-concat": "3.7.4",
diff --git a/ghost/admin/yarn.lock b/ghost/admin/yarn.lock
index e4d094de51..17585874c5 100644
--- a/ghost/admin/yarn.lock
+++ b/ghost/admin/yarn.lock
@@ -1638,18 +1638,18 @@ atob@^2.1.1:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-autoprefixer@9.6.1:
-  version "9.6.1"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.6.1.tgz#51967a02d2d2300bb01866c1611ec8348d355a47"
-  integrity sha512-aVo5WxR3VyvyJxcJC3h4FKfwCQvQWb1tSI5VHNibddCVWrcD1NvlxEweg3TSgiPztMnWfjpy2FURKA2kvDE+Tw==
+autoprefixer@9.6.4:
+  version "9.6.4"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.6.4.tgz#e6453be47af316b2923eaeaed87860f52ad4b7eb"
+  integrity sha512-Koz2cJU9dKOxG8P1f8uVaBntOv9lP4yz9ffWvWaicv9gHBPhpQB22nGijwd8gqW9CNT+UdkbQOQNLVI8jN1ZfQ==
   dependencies:
-    browserslist "^4.6.3"
-    caniuse-lite "^1.0.30000980"
+    browserslist "^4.7.0"
+    caniuse-lite "^1.0.30000998"
     chalk "^2.4.2"
     normalize-range "^0.1.2"
     num2fraction "^1.2.2"
-    postcss "^7.0.17"
-    postcss-value-parser "^4.0.0"
+    postcss "^7.0.18"
+    postcss-value-parser "^4.0.2"
 
 aws-sign2@~0.7.0:
   version "0.7.0"
@@ -3116,7 +3116,7 @@ browserslist@^3.2.6:
     caniuse-lite "^1.0.30000844"
     electron-to-chromium "^1.3.47"
 
-browserslist@^4.0.0, browserslist@^4.6.0, browserslist@^4.6.3, browserslist@^4.6.6:
+browserslist@^4.0.0, browserslist@^4.6.0, browserslist@^4.6.6, browserslist@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.7.0.tgz#9ee89225ffc07db03409f2fee524dc8227458a17"
   integrity sha512-9rGNDtnj+HaahxiVV38Gn8n8Lr8REKsel68v1sPFfIGEK6uSXTY3h9acgiT1dZVtOOUtifo/Dn8daDQ5dUgVsA==
@@ -3314,11 +3314,16 @@ caniuse-api@^3.0.0:
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
-caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000844, caniuse-lite@^1.0.30000980, caniuse-lite@^1.0.30000989:
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000844, caniuse-lite@^1.0.30000989:
   version "1.0.30000997"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000997.tgz#ba44a606804f8680894b7042612c2c7f65685b7e"
   integrity sha512-BQLFPIdj2ntgBNWp9Q64LGUIEmvhKkzzHhUHR3CD5A9Lb7ZKF20/+sgadhFap69lk5XmK1fTUleDclaRFvgVUA==
 
+caniuse-lite@^1.0.30000998:
+  version "1.0.30000999"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000999.tgz#427253a69ad7bea4aa8d8345687b8eec51ca0e43"
+  integrity sha512-1CUyKyecPeksKwXZvYw0tEoaMCo/RwBlXmEtN5vVnabvO0KPd9RQLcaAuR9/1F+KDMv6esmOFWlsXuzDk+8rxg==
+
 capture-exit@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/capture-exit/-/capture-exit-2.0.0.tgz#fb953bfaebeb781f62898239dabb426d08a509a4"
@@ -10087,7 +10092,7 @@ postcss-value-parser@^3.0.0, postcss-value-parser@^3.2.3, postcss-value-parser@^
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz#9ff822547e2893213cf1c30efa51ac5fd1ba8281"
   integrity sha512-pISE66AbVkp4fDQ7VHBwRNXzAAKJjw4Vw7nWI/+Q3vuly7SNfgYXvm6i5IgFylHGK5sP/xHAbB7N49OS4gWNyQ==
 
-postcss-value-parser@^4.0.0:
+postcss-value-parser@^4.0.2:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.0.2.tgz#482282c09a42706d1fc9a069b73f44ec08391dc9"
   integrity sha512-LmeoohTpp/K4UiyQCwuGWlONxXamGzCMtFxLq4W1nZVGIQLYvMCJx3yAF9qyyuFpflABI9yVdtJAqbihOsCsJQ==
@@ -10121,7 +10126,7 @@ postcss@^6.0.1, postcss@^6.0.11:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.17, postcss@^7.0.2, postcss@^7.0.5:
+postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.17, postcss@^7.0.18, postcss@^7.0.2, postcss@^7.0.5:
   version "7.0.18"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.18.tgz#4b9cda95ae6c069c67a4d933029eddd4838ac233"
   integrity sha512-/7g1QXXgegpF+9GJj4iN7ChGF40sYuGYJ8WZu8DZWnmhQ/G36hfdk3q9LBJmoK+lZ+yzZ5KYpOoxq7LF1BxE8g==