diff --git a/package.json b/package.json
index 3fc5c5f..8abf9ff 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "postcss-mixins": "6.2.0",
     "postcss-nested": "4.1.0",
     "postcss-normalize": "7.0.1",
-    "postcss-preset-env": "6.3.1",
+    "postcss-preset-env": "6.4.0",
     "postcss-utilities": "0.8.0"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 0ff86bd..99196fc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -409,9 +409,15 @@ cross-spawn@^5.0.1:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cssdb@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/cssdb/-/cssdb-4.1.0.tgz#5eff01703b3380256a6d2fd0dfa42de383b5f0e7"
+css-prefers-color-scheme@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/css-prefers-color-scheme/-/css-prefers-color-scheme-3.0.0.tgz#690f1eef52bff570791940e57d61b68ba9ed6d2a"
+  dependencies:
+    postcss "^7.0.5"
+
+cssdb@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/cssdb/-/cssdb-4.2.0.tgz#89623ec696121d0688080ccdcd4627c7e6c6ee0d"
 
 cssesc@^1.0.1:
   version "1.0.1"
@@ -1656,14 +1662,15 @@ postcss-place@^4.0.1:
     postcss "^7.0.2"
     postcss-values-parser "^2.0.0"
 
-postcss-preset-env@6.3.1:
-  version "6.3.1"
-  resolved "https://registry.yarnpkg.com/postcss-preset-env/-/postcss-preset-env-6.3.1.tgz#bd0f6353c44f41d0be61da278af33a6559e0aa6a"
+postcss-preset-env@6.4.0:
+  version "6.4.0"
+  resolved "https://registry.yarnpkg.com/postcss-preset-env/-/postcss-preset-env-6.4.0.tgz#f5466550b177454fc98ca5054b4478e8e5caa714"
   dependencies:
     autoprefixer "^9.3.1"
     browserslist "^4.3.4"
     caniuse-lite "^1.0.30000905"
-    cssdb "^4.1.0"
+    css-prefers-color-scheme "^3.0.0"
+    cssdb "^4.2.0"
     postcss "^7.0.5"
     postcss-attribute-case-insensitive "^4.0.0"
     postcss-color-functional-notation "^2.0.1"