diff --git a/package.json b/package.json
index e3b5276..cea87be 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "contributors": "https://github.com/TryGhost/Casper/graphs/contributors",
     "devDependencies": {
         "@tryghost/release-utils": "0.6.3",
-        "autoprefixer": "9.8.3",
+        "autoprefixer": "9.8.4",
         "beeper": "2.0.0",
         "cssnano": "4.1.10",
         "gscan": "3.5.4",
diff --git a/yarn.lock b/yarn.lock
index 9474a4e..3727367 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -429,14 +429,14 @@ atob@^2.1.2:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-autoprefixer@9.8.3:
-  version "9.8.3"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.8.3.tgz#e04c8b7f72c608e4aef1b74a542946e2ed271753"
-  integrity sha512-Y3CkEPqPqGw0TNBcMoUAxeZT9WEOAh0BPYENOTrN/bEfNBqjlYWjHbR1PKduBrmAVn8WbEZtMA3gAZO5MgV7Pg==
+autoprefixer@9.8.4:
+  version "9.8.4"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.8.4.tgz#736f1012673a70fa3464671d78d41abd54512863"
+  integrity sha512-84aYfXlpUe45lvmS+HoAWKCkirI/sw4JK0/bTeeqgHYco3dcsOn0NqdejISjptsYwNji/21dnkDri9PsYKk89A==
   dependencies:
     browserslist "^4.12.0"
     caniuse-lite "^1.0.30001087"
-    kleur "^4.0.1"
+    colorette "^1.2.0"
     normalize-range "^0.1.2"
     num2fraction "^1.2.2"
     postcss "^7.0.32"
@@ -926,6 +926,11 @@ color@^3.0.0:
     color-convert "^1.9.1"
     color-string "^1.5.2"
 
+colorette@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.0.tgz#45306add826d196e8c87236ac05d797f25982e63"
+  integrity sha512-soRSroY+OF/8OdA3PTQXwaDJeMc7TfknKKrxeSCencL2a4+Tx5zhxmmv7hdpCjhKBjehzp8+bwe/T68K0hpIjw==
+
 colors@^1.1.2:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/colors/-/colors-1.4.0.tgz#c50491479d4c1bdaed2c9ced32cf7c7dc2360f78"
@@ -2888,11 +2893,6 @@ kind-of@^6.0.0, kind-of@^6.0.2:
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.3.tgz#07c05034a6c349fa06e24fa35aa76db4580ce4dd"
   integrity sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==
 
-kleur@^4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/kleur/-/kleur-4.0.1.tgz#3d4948534b666e2578f93b6fafb62108e64f05ef"
-  integrity sha512-Qs6SqCLm63rd0kNVh+wO4XsWLU6kgfwwaPYsLiClWf0Tewkzsa6MvB21bespb8cz+ANS+2t3So1ge3gintzhlw==
-
 last-run@^1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/last-run/-/last-run-1.1.1.tgz#45b96942c17b1c79c772198259ba943bebf8ca5b"