diff --git a/package.json b/package.json
index d5747cb..461dfc2 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "contributors": "https://github.com/TryGhost/Casper/graphs/contributors",
     "devDependencies": {
         "@tryghost/release-utils": "0.6.6",
-        "autoprefixer": "9.8.6",
+        "autoprefixer": "10.0.0",
         "beeper": "2.0.0",
         "cssnano": "4.1.10",
         "gscan": "3.5.7",
diff --git a/yarn.lock b/yarn.lock
index cc86404..0b149fe 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -425,17 +425,16 @@ 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@9.8.6:
-  version "9.8.6"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.8.6.tgz#3b73594ca1bf9266320c5acf1588d74dea74210f"
-  integrity sha512-XrvP4VVHdRBCdX1S3WXVD8+RyG9qeb1D5Sn1DeLiG2xfSpzellk5k54xbUERJ3M5DggQxes39UGOTP8CFrEGbg==
+autoprefixer@10.0.0:
+  version "10.0.0"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-10.0.0.tgz#4afbe9eb902ffb5d7a9ef6d36013948fdb34601f"
+  integrity sha512-rFlVYthz6Iw0LhEYryiGGyjTGofebWie3ydvtqTCJiwWe+z6y8H35b4cadYbOUcYlP495TNeVktW+ZZqxbPW4Q==
   dependencies:
-    browserslist "^4.12.0"
-    caniuse-lite "^1.0.30001109"
+    browserslist "^4.14.2"
+    caniuse-lite "^1.0.30001131"
     colorette "^1.2.1"
     normalize-range "^0.1.2"
     num2fraction "^1.2.2"
-    postcss "^7.0.32"
     postcss-value-parser "^4.1.0"
 
 aws-sign2@~0.7.0:
@@ -581,7 +580,7 @@ braces@^2.3.1, braces@^2.3.2:
     split-string "^3.0.2"
     to-regex "^3.0.1"
 
-browserslist@^4.0.0, browserslist@^4.12.0:
+browserslist@^4.0.0:
   version "4.14.0"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.14.0.tgz#2908951abfe4ec98737b72f34c3bcedc8d43b000"
   integrity sha512-pUsXKAF2lVwhmtpeA3LJrZ76jXuusrNyhduuQs7CDFf9foT4Y38aQOserd2lMe5DSSrjf3fx34oHwryuvxAUgQ==
@@ -591,6 +590,16 @@ browserslist@^4.0.0, browserslist@^4.12.0:
     escalade "^3.0.2"
     node-releases "^1.1.60"
 
+browserslist@^4.14.2:
+  version "4.14.2"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.14.2.tgz#1b3cec458a1ba87588cc5e9be62f19b6d48813ce"
+  integrity sha512-HI4lPveGKUR0x2StIz+2FXfDk9SfVMrxn6PLh1JeGUwcuoDkdKZebWiyLRJ68iIPDpMI4JLVDf7S7XzslgWOhw==
+  dependencies:
+    caniuse-lite "^1.0.30001125"
+    electron-to-chromium "^1.3.564"
+    escalade "^3.0.2"
+    node-releases "^1.1.61"
+
 buffer-crc32@^0.2.1, buffer-crc32@^0.2.13, buffer-crc32@~0.2.3:
   version "0.2.13"
   resolved "https://registry.yarnpkg.com/buffer-crc32/-/buffer-crc32-0.2.13.tgz#0d333e3f00eac50aa1454abd30ef8c2a5d9a7242"
@@ -709,11 +718,16 @@ caniuse-api@^3.0.0:
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
-caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001109, caniuse-lite@^1.0.30001111:
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001111:
   version "1.0.30001120"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001120.tgz#cd21d35e537214e19f7b9f4f161f7b0f2710d46c"
   integrity sha512-JBP68okZs1X8D7MQTY602jxMYBmXEKOFkzTBaNSkubooMPFOAv2TXWaKle7qgHpjLDhUzA/TMT0qsNleVyXGUQ==
 
+caniuse-lite@^1.0.30001125, caniuse-lite@^1.0.30001131:
+  version "1.0.30001131"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001131.tgz#afad8a28fc2b7a0d3ae9407e71085a0ead905d54"
+  integrity sha512-4QYi6Mal4MMfQMSqGIRPGbKIbZygeN83QsWq1ixpUwvtfgAZot5BrCKzGygvZaV+CnELdTwD0S4cqUNozq7/Cw==
+
 caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
@@ -1389,6 +1403,11 @@ electron-to-chromium@^1.3.523:
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.555.tgz#a096716ff77cf8da9a608eb628fd6927869503d2"
   integrity sha512-/55x3nF2feXFZ5tdGUOr00TxnUjUgdxhrn+eCJ1FAcoAt+cKQTjQkUC5XF4frMWE1R5sjHk+JueuBalimfe5Pg==
 
+electron-to-chromium@^1.3.564:
+  version "1.3.568"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.568.tgz#0fa28cd3e5cbd9e8c66f72309eef0646f65a5b66"
+  integrity sha512-j9MlEwgTHVW/lq93Hw8yhzA886oLjDm3Hz7eDkWP2v4fzLVuqOWhpNluziSnmR/tBqgoYldagbLknrdg+B7Tlw==
+
 emoji-regex@9.0.0:
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-9.0.0.tgz#48a2309cc8a1d2e9d23bc6a67c39b63032e76ea4"
@@ -3196,6 +3215,11 @@ node-releases@^1.1.60:
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.60.tgz#6948bdfce8286f0b5d0e5a88e8384e954dfe7084"
   integrity sha512-gsO4vjEdQaTusZAEebUWp2a5d7dF5DYoIpDG7WySnk7BuZDW+GPpHXoXXuYawRBr/9t5q54tirPz79kFIWg4dA==
 
+node-releases@^1.1.61:
+  version "1.1.61"
+  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.61.tgz#707b0fca9ce4e11783612ba4a2fcba09047af16e"
+  integrity sha512-DD5vebQLg8jLCOzwupn954fbIiZht05DAZs0k2u8NStSe6h9XdsuIQL8hSRKYiU8WUQRznmSDrKGbv3ObOmC7g==
+
 nopt@^4.0.3:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.3.tgz#a375cad9d02fd921278d954c2254d5aa57e15e48"
@@ -3906,7 +3930,7 @@ 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@^7.0.2, postcss@^7.0.27, postcss@^7.0.32:
+postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.2, postcss@^7.0.27:
   version "7.0.32"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.32.tgz#4310d6ee347053da3433db2be492883d62cec59d"
   integrity sha512-03eXong5NLnNCD05xscnGKGDZ98CyzoqPSMjOe6SuoQY7Z2hIj0Ld1g/O/UQRuOle2aRtiIRDg9tDcTGAkLfKw==