diff --git a/package.json b/package.json
index cc132617..df65eff5 100644
--- a/package.json
+++ b/package.json
@@ -42,9 +42,9 @@
     "contributors": "https://github.com/TryGhost/Source/graphs/contributors",
     "devDependencies": {
         "@tryghost/release-utils": "0.8.1",
-        "autoprefixer": "10.4.7",
+        "autoprefixer": "10.4.18",
         "beeper": "2.1.0",
-        "cssnano": "5.1.12",
+        "cssnano": "5.1.15",
         "gscan": "4.39.4",
         "gulp": "4.0.2",
         "gulp-concat": "2.6.1",
diff --git a/yarn.lock b/yarn.lock
index efc35f4d..78159db6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1495,14 +1495,14 @@ 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@10.4.7:
-  version "10.4.7"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-10.4.7.tgz#1db8d195f41a52ca5069b7593be167618edbbedf"
-  integrity sha512-ypHju4Y2Oav95SipEcCcI5J7CGPuvz8oat7sUtYj3ClK44bldfvtvcxK6IEK++7rqB7YchDGzweZIBG+SD0ZAA==
-  dependencies:
-    browserslist "^4.20.3"
-    caniuse-lite "^1.0.30001335"
-    fraction.js "^4.2.0"
+autoprefixer@10.4.18:
+  version "10.4.18"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-10.4.18.tgz#fcb171a3b017be7cb5d8b7a825f5aacbf2045163"
+  integrity sha512-1DKbDfsr6KUElM6wg+0zRNkB/Q7WcKYAaK+pzXn+Xqmszm/5Xa9coeNdtP88Vi+dPzZnMjhge8GIV49ZQkDa+g==
+  dependencies:
+    browserslist "^4.23.0"
+    caniuse-lite "^1.0.30001591"
+    fraction.js "^4.3.7"
     normalize-range "^0.1.2"
     picocolors "^1.0.0"
     postcss-value-parser "^4.2.0"
@@ -1659,15 +1659,15 @@ braces@^2.3.1, braces@^2.3.2:
     split-string "^3.0.2"
     to-regex "^3.0.1"
 
-browserslist@^4.0.0, browserslist@^4.20.3, browserslist@^4.21.4:
-  version "4.21.9"
-  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.21.9.tgz#e11bdd3c313d7e2a9e87e8b4b0c7872b13897635"
-  integrity sha512-M0MFoZzbUrRU4KNfCrDLnvyE7gub+peetoTid3TBIqtunaDJyXlwhakT+/VkvSXcfIzFfK/nkCs4nmyTmxdNSg==
+browserslist@^4.0.0, browserslist@^4.21.4, browserslist@^4.23.0:
+  version "4.23.0"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.23.0.tgz#8f3acc2bbe73af7213399430890f86c63a5674ab"
+  integrity sha512-QW8HiM1shhT2GuzkvklfjcKDiWFXHOeFCIA/huJPwHsslwcydgk7X+z2zXpEijP98UCY7HbubZt5J2Zgvf0CaQ==
   dependencies:
-    caniuse-lite "^1.0.30001503"
-    electron-to-chromium "^1.4.431"
-    node-releases "^2.0.12"
-    update-browserslist-db "^1.0.11"
+    caniuse-lite "^1.0.30001587"
+    electron-to-chromium "^1.4.668"
+    node-releases "^2.0.14"
+    update-browserslist-db "^1.0.13"
 
 buffer-crc32@^0.2.1, buffer-crc32@^0.2.13, buffer-crc32@~0.2.3:
   version "0.2.13"
@@ -1796,10 +1796,10 @@ caniuse-api@^3.0.0:
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
-caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001335, caniuse-lite@^1.0.30001503:
-  version "1.0.30001512"
-  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001512.tgz#7450843fb581c39f290305a83523c7a9ef0d4cb4"
-  integrity sha512-2S9nK0G/mE+jasCUsMPlARhRCts1ebcp2Ji8Y8PWi4NDE1iRdLCnEPHkEfeBrGC45L4isBx5ur3IQ6yTE2mRZw==
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001587, caniuse-lite@^1.0.30001591:
+  version "1.0.30001591"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001591.tgz#16745e50263edc9f395895a7cd468b9f3767cf33"
+  integrity sha512-PCzRMei/vXjJyL5mJtzNiUCKP59dm8Apqc3PH8gJkMnMXZGox93RbE76jHsmLwmIo6/3nsYIpJtx0O7u5PqFuQ==
 
 caseless@~0.12.0:
   version "0.12.0"
@@ -2165,7 +2165,7 @@ cssesc@^3.0.0:
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-3.0.0.tgz#37741919903b868565e1c09ea747445cd18983ee"
   integrity sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg==
 
-cssnano-preset-default@^5.2.12:
+cssnano-preset-default@^5.2.14:
   version "5.2.14"
   resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.2.14.tgz#309def4f7b7e16d71ab2438052093330d9ab45d8"
   integrity sha512-t0SFesj/ZV2OTylqQVOrFgEh5uanxbO6ZAdeCrNsUQ6fVuXwYTxJPNAGvGTxHbD68ldIJNec7PyYZDBrfDQ+6A==
@@ -2205,12 +2205,12 @@ cssnano-utils@^3.1.0:
   resolved "https://registry.yarnpkg.com/cssnano-utils/-/cssnano-utils-3.1.0.tgz#95684d08c91511edfc70d2636338ca37ef3a6861"
   integrity sha512-JQNR19/YZhz4psLX/rQ9M83e3z2Wf/HdJbryzte4a3NSuafyp9w/I4U+hx5C2S9g41qlstH7DEWnZaaj83OuEA==
 
-cssnano@5.1.12:
-  version "5.1.12"
-  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.1.12.tgz#bcd0b64d6be8692de79332c501daa7ece969816c"
-  integrity sha512-TgvArbEZu0lk/dvg2ja+B7kYoD7BBCmn3+k58xD0qjrGHsFzXY/wKTo9M5egcUCabPol05e/PVoIu79s2JN4WQ==
+cssnano@5.1.15:
+  version "5.1.15"
+  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.1.15.tgz#ded66b5480d5127fcb44dac12ea5a983755136bf"
+  integrity sha512-j+BKgDcLDQA+eDifLx0EO4XSA56b7uut3BQFH+wbSaSTuGLuiyTa/wbRYthUXX8LC9mLg+WWKe8h+qJuwTAbHw==
   dependencies:
-    cssnano-preset-default "^5.2.12"
+    cssnano-preset-default "^5.2.14"
     lilconfig "^2.0.3"
     yaml "^1.10.2"
 
@@ -2441,10 +2441,10 @@ ee-first@1.1.1:
   resolved "https://registry.yarnpkg.com/ee-first/-/ee-first-1.1.1.tgz#590c61156b0ae2f4f0255732a158b266bc56b21d"
   integrity sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==
 
-electron-to-chromium@^1.4.431:
-  version "1.4.449"
-  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.4.449.tgz#79ffe4514c81c35d4eb13030a63ff3383a8cc655"
-  integrity sha512-TxLRpRUj/107ATefeP8VIUWNOv90xJxZZbCW/eIbSZQiuiFANCx2b7u+GbVc9X4gU+xnbvypNMYVM/WArE1DNQ==
+electron-to-chromium@^1.4.668:
+  version "1.4.689"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.4.689.tgz#94fe370b800d978b606a2b4c0c5db5c8c98db4f2"
+  integrity sha512-GatzRKnGPS1go29ep25reM94xxd1Wj8ritU0yRhCJ/tr1Bg8gKnm6R9O/yPOhGQBoLMZ9ezfrpghNaTw97C/PQ==
 
 emoji-regex@^10.0.0:
   version "10.2.1"
@@ -2864,10 +2864,10 @@ forwarded@0.2.0:
   resolved "https://registry.yarnpkg.com/forwarded/-/forwarded-0.2.0.tgz#2269936428aad4c15c7ebe9779a84bf0b2a81811"
   integrity sha512-buRG0fpBtRHSTCOASe6hD258tEubFoRLb4ZNA6NxMVHNw2gOcwHo9wyablzMzOA5z9xA9L1KNjk/Nt6MT9aYow==
 
-fraction.js@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/fraction.js/-/fraction.js-4.2.0.tgz#448e5109a313a3527f5a3ab2119ec4cf0e0e2950"
-  integrity sha512-MhLuK+2gUcnZe8ZHlaaINnQLl0xRIGRfcGk2yl8xoQAfHrSsL3rYu6FCmBdkdbhc9EPlwyGHewaRsvwRMJtAlA==
+fraction.js@^4.3.7:
+  version "4.3.7"
+  resolved "https://registry.yarnpkg.com/fraction.js/-/fraction.js-4.3.7.tgz#06ca0085157e42fda7f9e726e79fefc4068840f7"
+  integrity sha512-ZsDfxO51wGAXREY55a7la9LScWpwv9RxIrYABrlvOFBlH/ShPnrtsXeuUIfXKKOVicNxQ+o8JTbJvjS4M89yew==
 
 fragment-cache@^0.2.1:
   version "0.2.1"
@@ -4247,10 +4247,10 @@ node-loggly-bulk@^2.2.4:
     moment "^2.18.1"
     request ">=2.76.0 <3.0.0"
 
-node-releases@^2.0.12:
-  version "2.0.12"
-  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-2.0.12.tgz#35627cc224a23bfb06fb3380f2b3afaaa7eb1039"
-  integrity sha512-QzsYKWhXTWx8h1kIvqfnC++o0pEmpRQA/aenALsL2F4pqNVr7YzcdMlDij5WBnwftRbJCNJL/O7zdKaxKPHqgQ==
+node-releases@^2.0.14:
+  version "2.0.14"
+  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-2.0.14.tgz#2ffb053bceb8b2be8495ece1ab6ce600c4461b0b"
+  integrity sha512-y10wOWt8yZpqXmOgRo77WaHEmhYQYGNA6y421PKsKYWEK8aW+cqAphborZDhqfyKrbZEN92CN1X2KbafY2s7Yw==
 
 nopt@^6.0.0:
   version "6.0.0"
@@ -5920,10 +5920,10 @@ upath@^1.1.1:
   resolved "https://registry.yarnpkg.com/upath/-/upath-1.2.0.tgz#8f66dbcd55a883acdae4408af8b035a5044c1894"
   integrity sha512-aZwGpamFO61g3OlfT7OQCHqhGnW43ieH9WZeP7QxN/G/jS4jfqUkZxoryvJgVPEcrl5NL/ggHsSmLMHuH64Lhg==
 
-update-browserslist-db@^1.0.11:
-  version "1.0.11"
-  resolved "https://registry.yarnpkg.com/update-browserslist-db/-/update-browserslist-db-1.0.11.tgz#9a2a641ad2907ae7b3616506f4b977851db5b940"
-  integrity sha512-dCwEFf0/oT85M1fHBg4F0jtLwJrutGoHSQXCh7u4o2t1drG+c0a9Flnqww6XUKSfQMPpJBRjU8d4RXB09qtvaA==
+update-browserslist-db@^1.0.13:
+  version "1.0.13"
+  resolved "https://registry.yarnpkg.com/update-browserslist-db/-/update-browserslist-db-1.0.13.tgz#3c5e4f5c083661bd38ef64b6328c26ed6c8248c4"
+  integrity sha512-xebP81SNcPuNpPP3uzeW1NYXxI3rxyJzF3pD6sH4jE7o/IX+WtSpwnVU+qIsDPyk0d3hmFQ7mjqc6AtV604hbg==
   dependencies:
     escalade "^3.1.1"
     picocolors "^1.0.0"