diff --git a/package.json b/package.json
index 0040f41..6828a30 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "license": "MIT",
   "repository": "RadValentin/postcss-prefix-selector",
   "dependencies": {
-    "postcss": "^5.0.8"
+    "postcss": "^6.0.0"
   },
   "devDependencies": {
     "husky": "^0.13.3",
diff --git a/yarn.lock b/yarn.lock
index f563fc1..feb0e1b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -442,10 +442,6 @@ jest-validate@19.0.0:
     leven "^2.0.0"
     pretty-format "^19.0.0"
 
-js-base64@^2.1.9:
-  version "2.1.9"
-  resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-2.1.9.tgz#f0e80ae039a4bd654b5f281fc93f04a914a7fcce"
-
 js-tokens@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.1.tgz#08e9f132484a2c45a30907e9dc4d5567b7f114d7"
@@ -758,12 +754,11 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
-postcss@^5.0.8:
-  version "5.2.15"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-5.2.15.tgz#a9e8685e50e06cc5b3fdea5297273246c26f5b30"
+postcss@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.0.tgz#ef75a67e75fe2bfff53971045697202c018b2e81"
   dependencies:
     chalk "^1.1.3"
-    js-base64 "^2.1.9"
     source-map "^0.5.6"
     supports-color "^3.2.3"