diff --git a/package.json b/package.json
index b9ae03fd..aba4109f 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "devDependencies": {
         "autoprefixer": "10.4.7",
         "beeper": "2.1.0",
-        "cssnano": "5.1.8",
+        "cssnano": "5.1.9",
         "gscan": "4.29.2",
         "gulp": "4.0.2",
         "gulp-livereload": "4.0.2",
diff --git a/yarn.lock b/yarn.lock
index 82cb0602..d76b1502 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1262,10 +1262,10 @@ 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@^5.2.8:
-  version "5.2.8"
-  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.2.8.tgz#d7886e8cf6d075ae2298d7526b4cccf0eacdcbdc"
-  integrity sha512-6xQXUhTAPupvib3KC0Gl0d1jIwGFcJyuWQiMcA6grprGdmIzt1cxG5z78VuZu6DRRS6qin6ETkQsH6ixxb/SQw==
+cssnano-preset-default@^5.2.9:
+  version "5.2.9"
+  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.2.9.tgz#63f6aa9a9f0b21d9a526371dd308253b656a9784"
+  integrity sha512-/4qcQcAfFEg+gnXE5NxKmYJ9JcT+8S5SDuJCLYMDN8sM/ymZ+lgLXq5+ohx/7V2brUCkgW2OaoCzOdAN0zvhGw==
   dependencies:
     css-declaration-sorter "^6.2.2"
     cssnano-utils "^3.1.0"
@@ -1276,7 +1276,7 @@ cssnano-preset-default@^5.2.8:
     postcss-discard-duplicates "^5.1.0"
     postcss-discard-empty "^5.1.1"
     postcss-discard-overridden "^5.1.0"
-    postcss-merge-longhand "^5.1.4"
+    postcss-merge-longhand "^5.1.5"
     postcss-merge-rules "^5.1.1"
     postcss-minify-font-values "^5.1.0"
     postcss-minify-gradients "^5.1.1"
@@ -1302,12 +1302,12 @@ 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@5.1.8:
-  version "5.1.8"
-  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.1.8.tgz#6add8a61c8ae493184689af347e61b1bc7cd57dd"
-  integrity sha512-5lma/yQlK+6eOHSUqNAS11b4/fbiuasoxmCHoVYxSg6lQsyX7bGGIqiLi4o3Pe2CrUTrgcD2udW7JIgzC2806g==
+cssnano@5.1.9:
+  version "5.1.9"
+  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.1.9.tgz#e6cb286c4907cbd55678eb315837a21008be21be"
+  integrity sha512-hctQHIIeDrfMjq0bQhoVmRVaSeNNOGxkvkKVOcKpJzLr09wlRrZWH4GaYudp0aszpW8wJeaO5/yBmID9n7DNCg==
   dependencies:
-    cssnano-preset-default "^5.2.8"
+    cssnano-preset-default "^5.2.9"
     lilconfig "^2.0.3"
     yaml "^1.10.2"
 
@@ -3995,10 +3995,10 @@ postcss-load-config@^3.0.0:
     lilconfig "^2.0.5"
     yaml "^1.10.2"
 
-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==
+postcss-merge-longhand@^5.1.5:
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-5.1.5.tgz#b0e03bee3b964336f5f33c4fc8eacae608e91c05"
+  integrity sha512-NOG1grw9wIO+60arKa2YYsrbgvP6tp+jqc7+ZD5/MalIw234ooH2C6KlR6FEn4yle7GqZoBxSK1mLBE9KPur6w==
   dependencies:
     postcss-value-parser "^4.2.0"
     stylehacks "^5.1.0"