diff --git a/CHANGELOG.md b/CHANGELOG.md
index b988ae58..8cb9706f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # CHANGELOG
 
+## 0.30.0
+
+ * The `fork-ts-checker-webpack-plugin` package was upgraded for the tests
+   from `^0.4.1` to `^4.0.0`. If you're using `enableForkedTypeScriptTypesChecking()`,
+   you control the `fork-ts-checker-webpack-plugin` version in your
+   `package.json` file. You should upgrade to `^4.0.0` to ensure
+   that the plugin works correctly with Encore. See
+   [fork-ts-checker-webpack-plugin](https://github.com/TypeStrong/fork-ts-checker-webpack-plugin)
+   for details about the changes.
+
 ## 0.29.0
 
  * Support for Node 8 was dropped.
diff --git a/package.json b/package.json
index 460c0f16..0a794d5d 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
     "eslint-plugin-header": "^1.0.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-node": "^8.0.1",
-    "fork-ts-checker-webpack-plugin": "^0.4.1",
+    "fork-ts-checker-webpack-plugin": "^4.0.0",
     "fs-extra": "^9.0.0",
     "handlebars": "^4.0.11",
     "handlebars-loader": "^1.7.0",
diff --git a/yarn.lock b/yarn.lock
index 8780c6d6..f65bacd2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2053,7 +2053,7 @@ chardet@^0.7.0:
   optionalDependencies:
     fsevents "~2.1.2"
 
-chokidar@^2.0.4, chokidar@^2.1.8:
+chokidar@^2.1.8:
   version "2.1.8"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-2.1.8.tgz#804b3a7b6a99358c3c5c61e71d8728f041cff917"
   integrity sha512-ZmZUazfOzf0Nve7duiCKD23PFSCs4JPoYyccjUFF3aQkQadqBhfzhjkwBH2mNOG9cTBwhamM37EIsIkZw3nRgg==
@@ -3722,19 +3722,18 @@ forever-agent@~0.6.1:
   resolved "https://registry.yarnpkg.com/forever-agent/-/forever-agent-0.6.1.tgz#fbc71f0c41adeb37f96c577ad1ed42d8fdacca91"
   integrity sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=
 
-fork-ts-checker-webpack-plugin@^0.4.1:
-  version "0.4.15"
-  resolved "https://registry.yarnpkg.com/fork-ts-checker-webpack-plugin/-/fork-ts-checker-webpack-plugin-0.4.15.tgz#7cd9f94f3dd58cd1fe8f953f876e72090eda3f6d"
-  integrity sha512-qNYuygh2GxXehBvQZ5rI5YlQFn+7ZV6kmkyD9Sgs33dWl73NZdUOB5aCp8v0EXJn176AhPrZP8YCMT3h01fs+g==
+fork-ts-checker-webpack-plugin@^4.0.0:
+  version "4.1.3"
+  resolved "https://registry.yarnpkg.com/fork-ts-checker-webpack-plugin/-/fork-ts-checker-webpack-plugin-4.1.3.tgz#306f1566fc1c916816830b3de4e53da8d6d6a9e2"
+  integrity sha512-ErA8cFsPfAIOx2UFoRlMraGVB1Ye3bXQTdNW6lmeKQDuNnkORqJmA9bcReNxJj5kVHeKkKcNZv3f6PMyeugO+w==
   dependencies:
     babel-code-frame "^6.22.0"
     chalk "^2.4.1"
-    chokidar "^2.0.4"
-    lodash "^4.17.11"
     micromatch "^3.1.10"
     minimatch "^3.0.4"
-    resolve "^1.5.0"
+    semver "^5.6.0"
     tapable "^1.0.0"
+    worker-rpc "^0.1.0"
 
 form-data@~2.3.2:
   version "2.3.3"
@@ -5374,6 +5373,11 @@ methods@~1.1.2:
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
   integrity sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4=
 
+microevent.ts@~0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/microevent.ts/-/microevent.ts-0.1.1.tgz#70b09b83f43df5172d0205a63025bce0f7357fa0"
+  integrity sha512-jo1OfR4TaEwd5HOrt5+tAZ9mqT4jmpNAusXtyfNzqVm9uiSYFZlKM1wYL4oU7azZW/PxQW53wM0S6OR1JHNa2g==
+
 micromatch@^3.0.4, micromatch@^3.1.10, micromatch@^3.1.4:
   version "3.1.10"
   resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-3.1.10.tgz#70859bc95c9840952f359a068a3fc49f9ecfac23"
@@ -7224,7 +7228,7 @@ resolve-url@^0.2.1:
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
   integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
 
-resolve@^1.10.0, resolve@^1.12.0, resolve@^1.13.1, resolve@^1.3.2, resolve@^1.5.0, resolve@^1.8.1:
+resolve@^1.10.0, resolve@^1.12.0, resolve@^1.13.1, resolve@^1.3.2, resolve@^1.8.1:
   version "1.17.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.17.0.tgz#b25941b54968231cc2d1bb76a79cb7f2c0bf8444"
   integrity sha512-ic+7JYiV8Vi2yzQGFWOkiZD5Z9z7O2Zhm9XMaTxdJExKasieFCr+yXZ/WmXsckHiKl12ar0y6XiXDx3m4RHn1w==
@@ -8886,6 +8890,13 @@ worker-farm@^1.7.0:
   dependencies:
     errno "~0.1.7"
 
+worker-rpc@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/worker-rpc/-/worker-rpc-0.1.1.tgz#cb565bd6d7071a8f16660686051e969ad32f54d5"
+  integrity sha512-P1WjMrUB3qgJNI9jfmpZ/htmBEjFh//6l/5y8SD9hg1Ef5zTTVVoRjTrTEzPrNBQvmhMxkoTsjOXN10GWU7aCg==
+  dependencies:
+    microevent.ts "~0.1.1"
+
 wrap-ansi@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"