diff --git a/package.json b/package.json
index 6142dc6..84b687d 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "html-webpack-plugin": "^2.30.1",
     "node-notifier": "^5.1.2",
     "node-sass": "^4.6.1",
-    "optimize-css-assets-webpack-plugin": "^3.2.0",
+    "optimize-css-assets-webpack-plugin": "^4.0.1",
     "ora": "^1.2.0",
     "portfinder": "^1.0.13",
     "postcss-loader": "^2.0.8",
diff --git a/yarn.lock b/yarn.lock
index c15b3ca..ea0b1b2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3918,12 +3918,12 @@ kind-of@^6.0.0, kind-of@^6.0.2:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.2.tgz#01146b36a6218e64e58f3a8d66de5d7fc6f6d051"
 
-last-call-webpack-plugin@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/last-call-webpack-plugin/-/last-call-webpack-plugin-2.1.2.tgz#ad80c6e310998294d2ed2180a68e9589e4768c44"
+last-call-webpack-plugin@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/last-call-webpack-plugin/-/last-call-webpack-plugin-3.0.0.tgz#9742df0e10e3cf46e5c0381c2de90d3a7a2d7555"
   dependencies:
-    lodash "^4.17.4"
-    webpack-sources "^1.0.1"
+    lodash "^4.17.5"
+    webpack-sources "^1.1.0"
 
 latest-version@^3.0.0:
   version "3.1.0"
@@ -4619,12 +4619,12 @@ opn@^5.1.0:
   dependencies:
     is-wsl "^1.1.0"
 
-optimize-css-assets-webpack-plugin@^3.2.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/optimize-css-assets-webpack-plugin/-/optimize-css-assets-webpack-plugin-3.2.0.tgz#09a40c4cefde1dd0142444a873c56aa29eb18e6f"
+optimize-css-assets-webpack-plugin@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/optimize-css-assets-webpack-plugin/-/optimize-css-assets-webpack-plugin-4.0.1.tgz#48f016766752c7648b92cc1e795b999732bd87a2"
   dependencies:
     cssnano "^3.4.0"
-    last-call-webpack-plugin "^2.1.2"
+    last-call-webpack-plugin "^3.0.0"
 
 optionator@^0.8.2:
   version "0.8.2"
@@ -6887,7 +6887,7 @@ webpack-merge@^4.1.0:
   dependencies:
     lodash "^4.17.5"
 
-webpack-sources@^1.0.1:
+webpack-sources@^1.0.1, webpack-sources@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.1.0.tgz#a101ebae59d6507354d71d8013950a3a8b7a5a54"
   dependencies: