diff --git a/package.json b/package.json
index 786eaaf1..5abf06fe 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "devDependencies": {
         "autoprefixer": "10.4.0",
         "beeper": "2.1.0",
-        "cssnano": "5.0.9",
+        "cssnano": "5.0.10",
         "gscan": "4.10.1",
         "gulp": "4.0.2",
         "gulp-livereload": "4.0.2",
diff --git a/yarn.lock b/yarn.lock
index b4050388..12f3b0c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1142,10 +1142,10 @@ 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@^5.1.5:
-  version "5.1.5"
-  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.1.5.tgz#6effb7175ee5d296f95330e137587e27ee974d44"
-  integrity sha512-fF00UI+d3PWkGfMd62geqmoUe5h+LOhGE2GH4Fqq3beNKdCU1LWwLUyIcu4/A72lWv0737cHey5zhhWw3rW0sA==
+cssnano-preset-default@^5.1.6:
+  version "5.1.6"
+  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-5.1.6.tgz#1bdb83be6a6b1fee6dc5e9ec2e61286bcadcc7a6"
+  integrity sha512-X2nDeNGBXc0486oHjT2vSj+TdeyVsxRvJUxaOH50hOM6vSDLkKd0+59YXpSZRInJ4sNtBOykS4KsPfhdrU/35w==
   dependencies:
     css-declaration-sorter "^6.0.3"
     cssnano-utils "^2.0.1"
@@ -1156,7 +1156,7 @@ cssnano-preset-default@^5.1.5:
     postcss-discard-duplicates "^5.0.1"
     postcss-discard-empty "^5.0.1"
     postcss-discard-overridden "^5.0.1"
-    postcss-merge-longhand "^5.0.2"
+    postcss-merge-longhand "^5.0.3"
     postcss-merge-rules "^5.0.2"
     postcss-minify-font-values "^5.0.1"
     postcss-minify-gradients "^5.0.3"
@@ -1182,12 +1182,12 @@ cssnano-utils@^2.0.1:
   resolved "https://registry.yarnpkg.com/cssnano-utils/-/cssnano-utils-2.0.1.tgz#8660aa2b37ed869d2e2f22918196a9a8b6498ce2"
   integrity sha512-i8vLRZTnEH9ubIyfdZCAdIdgnHAUeQeByEeQ2I7oTilvP9oHO6RScpeq3GsFUVqeB8uZgOQ9pw8utofNn32hhQ==
 
-cssnano@5.0.9:
-  version "5.0.9"
-  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.0.9.tgz#bd03168835c0883c16754085704f57861a32d99c"
-  integrity sha512-Y4olTKBKsPKl5izpcXHRDiB/1rVdbIDM4qVXgEKBt466kYT42SEEsnCYOQFFXzEkUYV8pJNCII9JKzb8KfDk+g==
+cssnano@5.0.10:
+  version "5.0.10"
+  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-5.0.10.tgz#92207eb7c9c6dc08d318050726f9fad0adf7220b"
+  integrity sha512-YfNhVJJ04imffOpbPbXP2zjIoByf0m8E2c/s/HnvSvjXgzXMfgopVjAEGvxYOjkOpWuRQDg/OZFjO7WW94Ri8w==
   dependencies:
-    cssnano-preset-default "^5.1.5"
+    cssnano-preset-default "^5.1.6"
     is-resolvable "^1.1.0"
     lilconfig "^2.0.3"
     yaml "^1.10.2"
@@ -3864,10 +3864,10 @@ postcss-load-config@^3.0.0:
     lilconfig "^2.0.3"
     yaml "^1.10.2"
 
-postcss-merge-longhand@^5.0.2:
-  version "5.0.2"
-  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-5.0.2.tgz#277ada51d9a7958e8ef8cf263103c9384b322a41"
-  integrity sha512-BMlg9AXSI5G9TBT0Lo/H3PfUy63P84rVz3BjCFE9e9Y9RXQZD3+h3YO1kgTNsNJy7bBc1YQp8DmSnwLIW5VPcw==
+postcss-merge-longhand@^5.0.3:
+  version "5.0.3"
+  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-5.0.3.tgz#42194a5ffbaa5513edbf606ef79c44958564658b"
+  integrity sha512-kmB+1TjMTj/bPw6MCDUiqSA5e/x4fvLffiAdthra3a0m2/IjTrWsTmD3FdSskzUjEwkj5ZHBDEbv5dOcqD7CMQ==
   dependencies:
     css-color-names "^1.0.1"
     postcss-value-parser "^4.1.0"