diff --git a/package.json b/package.json
index 489eb86e..81fc8fee 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "devDependencies": {
         "autoprefixer": "10.4.4",
         "beeper": "2.1.0",
-        "cssnano": "5.1.5",
+        "cssnano": "5.1.7",
         "gscan": "4.26.1",
         "gulp": "4.0.2",
         "gulp-livereload": "4.0.2",
diff --git a/yarn.lock b/yarn.lock
index 1171add1..503c69af 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1204,12 +1204,10 @@ crc@^3.4.4:
   dependencies:
     buffer "^5.1.0"
 
-css-declaration-sorter@^6.0.3:
-  version "6.1.4"
-  resolved "https://registry.yarnpkg.com/css-declaration-sorter/-/css-declaration-sorter-6.1.4.tgz#b9bfb4ed9a41f8dcca9bf7184d849ea94a8294b4"
-  integrity sha512-lpfkqS0fctcmZotJGhnxkIyJWvBXgpyi2wsFd4J8VB7wzyrT6Ch/3Q+FMNJpjK4gu1+GN5khOnpU2ZVKrLbhCw==
-  dependencies:
-    timsort "^0.3.0"
+css-declaration-sorter@^6.2.2:
+  version "6.2.2"
+  resolved "https://registry.yarnpkg.com/css-declaration-sorter/-/css-declaration-sorter-6.2.2.tgz#bfd2f6f50002d6a3ae779a87d3a0c5d5b10e0f02"
+  integrity sha512-Ufadglr88ZLsrvS11gjeu/40Lw74D9Am/Jpr3LlYm5Q4ZP5KdlUhG+6u2EjyXeZcxmZ2h1ebCKngDjolpeLHpg==
 
 css-select@^4.1.3:
   version "4.2.1"
@@ -1249,12 +1247,12 @@ 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@^5.2.5:
-  version "5.2.5"
-  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.2.5.tgz#267ded811a3e1664d78707f5355fcd89feeb38ac"
-  integrity sha512-WopL7PzN7sos3X8B54/QGl+CZUh1f0qN4ds+y2d5EPwRSSc3jsitVw81O+Uyop0pXyOfPfZxnc+LmA8w/Ki/WQ==
+cssnano-preset-default@^5.2.7:
+  version "5.2.7"
+  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.2.7.tgz#791e3603fb8f1b46717ac53b47e3c418e950f5f3"
+  integrity sha512-JiKP38ymZQK+zVKevphPzNSGHSlTI+AOwlasoSRtSVMUU285O7/6uZyd5NbW92ZHp41m0sSHe6JoZosakj63uA==
   dependencies:
-    css-declaration-sorter "^6.0.3"
+    css-declaration-sorter "^6.2.2"
     cssnano-utils "^3.1.0"
     postcss-calc "^8.2.3"
     postcss-colormin "^5.3.0"
@@ -1263,7 +1261,7 @@ cssnano-preset-default@^5.2.5:
     postcss-discard-duplicates "^5.1.0"
     postcss-discard-empty "^5.1.1"
     postcss-discard-overridden "^5.1.0"
-    postcss-merge-longhand "^5.1.3"
+    postcss-merge-longhand "^5.1.4"
     postcss-merge-rules "^5.1.1"
     postcss-minify-font-values "^5.1.0"
     postcss-minify-gradients "^5.1.1"
@@ -1289,12 +1287,12 @@ 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@5.1.5:
-  version "5.1.5"
-  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.1.5.tgz#5f3f519538c7f1c182c527096892243db3e17397"
-  integrity sha512-VZO1e+bRRVixMeia1zKagrv0lLN1B/r/u12STGNNUFxnp97LIFgZHQa0JxqlwEkvzUyA9Oz/WnCTAFkdEbONmg==
+cssnano@5.1.7:
+  version "5.1.7"
+  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.1.7.tgz#99858bef6c76c9240f0cdc9239570bc7db8368be"
+  integrity sha512-pVsUV6LcTXif7lvKKW9ZrmX+rGRzxkEdJuVJcp5ftUjWITgwam5LMZOgaTvUrWPkcORBey6he7JKb4XAJvrpKg==
   dependencies:
-    cssnano-preset-default "^5.2.5"
+    cssnano-preset-default "^5.2.7"
     lilconfig "^2.0.3"
     yaml "^1.10.2"
 
@@ -3985,10 +3983,10 @@ postcss-load-config@^3.0.0:
     lilconfig "^2.0.4"
     yaml "^1.10.2"
 
-postcss-merge-longhand@^5.1.3:
-  version "5.1.3"
-  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-5.1.3.tgz#a49e2be6237316e3b55e329e0a8da15d1f9f47ab"
-  integrity sha512-lX8GPGvZ0iGP/IboM7HXH5JwkXvXod1Rr8H8ixwiA372hArk0zP4ZcCy4z4Prg/bfNlbbTf0KCOjCF9kKnpP/w==
+postcss-merge-longhand@^5.1.4:
+  version "5.1.4"
+  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-5.1.4.tgz#0f46f8753989a33260efc47de9a0cdc571f2ec5c"
+  integrity sha512-hbqRRqYfmXoGpzYKeW0/NCZhvNyQIlQeWVSao5iKWdyx7skLvCfQFGIUsP9NUs3dSbPac2IC4Go85/zG+7MlmA==
   dependencies:
     postcss-value-parser "^4.2.0"
     stylehacks "^5.1.0"
@@ -5015,11 +5013,6 @@ timers-ext@^0.1.7:
     es5-ext "~0.10.46"
     next-tick "1"
 
-timsort@^0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/timsort/-/timsort-0.3.0.tgz#405411a8e7e6339fe64db9a234de11dc31e02bd4"
-  integrity sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q=
-
 tiny-lr@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/tiny-lr/-/tiny-lr-1.1.1.tgz#9fa547412f238fedb068ee295af8b682c98b2aab"