diff --git a/package.json b/package.json
index 56c2446c..8c43b347 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "babel-eslint": "10.1.0",
     "broccoli-asset-rev": "3.0.0",
     "ember-auto-import": "2.2.4",
-    "ember-cli": "3.28.5",
+    "ember-cli": "4.0.1",
     "ember-cli-dependency-checker": "3.2.0",
     "ember-cli-inject-live-reload": "2.1.0",
     "ember-cli-htmlbars": "6.0.1",
diff --git a/yarn.lock b/yarn.lock
index 68ea7b13..417d564d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4961,10 +4961,10 @@ ember-cli-version-checker@^5.1.1, ember-cli-version-checker@^5.1.2:
     semver "^7.3.4"
     silent-error "^1.1.1"
 
-ember-cli@3.28.5:
-  version "3.28.5"
-  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.28.5.tgz#9c91266e412f6d537b47a88e4b63a2b56db35483"
-  integrity sha512-Y/UdbUOTeKHGMCP3XtE5g14JUTYyeQTdjPvHuv11FFx5HQBtHqqWLY6U1ivMDukDkQ4i2v6TyaUcKVo4e8PtyQ==
+ember-cli@4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-4.0.1.tgz#2f5fc81a0aa6b3003addb064e00e5e41372bd58b"
+  integrity sha512-5FYStQlpdF1Qn7+iPe3YCpq131Sjey8LTilLb5xp+L+GpGE4b+9/8hzI3dIHh7WQSvoeuR5AAluP9nNq1ENgSw==
   dependencies:
     "@babel/core" "^7.13.8"
     "@babel/plugin-transform-modules-amd" "^7.12.1"
@@ -5054,7 +5054,7 @@ ember-cli@3.28.5:
     tree-sync "^2.1.0"
     uuid "^8.3.2"
     walk-sync "^2.2.0"
-    watch-detector "^1.0.0"
+    watch-detector "^1.0.1"
     workerpool "^6.1.4"
     yam "^1.0.0"
 
@@ -12431,7 +12431,7 @@ walker@~1.0.5:
   dependencies:
     makeerror "1.0.12"
 
-watch-detector@^1.0.0:
+watch-detector@^1.0.0, watch-detector@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/watch-detector/-/watch-detector-1.0.1.tgz#3106a6b489284ec2ecaef0e65cf1b8ec9117296e"
   integrity sha512-8sJ8rvNfg2ciqCa5IxIdmdxU/vuUe9V/jw+thXbdreELSv3+Cq6k8K42cLEL86W2td1PMmfNCWZuAhrZ/sD4mw==