diff --git a/package.json b/package.json
index 3388bfed..d767a228 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "before": "broccoli-asset-rev"
   },
   "devDependencies": {
-    "ember-cli": "^3.0.0",
+    "ember-cli": "~3.0.0",
     "ember-cli-babel": "^6.11.0",
     "ember-cli-htmlbars": "^2.0.3",
     "ember-cli-qunit": "^4.3.2",
diff --git a/yarn.lock b/yarn.lock
index 366254a8..02901101 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1000,12 +1000,12 @@ broccoli-merge-trees@^2.0.0:
     broccoli-plugin "^1.3.0"
     merge-trees "^1.0.1"
 
-broccoli-middleware@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/broccoli-middleware/-/broccoli-middleware-1.0.0.tgz#92f4e1fb9a791ea986245a7077f35cc648dab097"
+broccoli-middleware@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/broccoli-middleware/-/broccoli-middleware-1.2.1.tgz#a21f255f8bfe5a21c2f0fbf2417addd9d24c9436"
   dependencies:
     handlebars "^4.0.4"
-    mime "^1.2.11"
+    mime-types "^2.1.18"
 
 broccoli-persistent-filter@^1.0.3, broccoli-persistent-filter@^1.1.6, broccoli-persistent-filter@^1.4.0:
   version "1.4.3"
@@ -1733,9 +1733,9 @@ ember-cli-version-checker@^2.0.0, ember-cli-version-checker@^2.1.0:
     resolve "^1.3.3"
     semver "^5.3.0"
 
-ember-cli@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.0.0.tgz#3d44be3ea88345d4d03c95453eb3527b15dbaeb2"
+ember-cli@~3.0.0:
+  version "3.0.4"
+  resolved "http://registry.npmjs.org/ember-cli/-/ember-cli-3.0.4.tgz#89275dd59994c64fa0ed5dcec24c83cd2935320b"
   dependencies:
     amd-name-resolver "1.0.0"
     babel-plugin-transform-es2015-modules-amd "^6.24.0"
@@ -1750,7 +1750,7 @@ ember-cli@^3.0.0:
     broccoli-funnel "^2.0.0"
     broccoli-funnel-reducer "^1.0.0"
     broccoli-merge-trees "^2.0.0"
-    broccoli-middleware "^1.0.0"
+    broccoli-middleware "^1.2.1"
     broccoli-source "^1.1.0"
     broccoli-stew "^1.2.0"
     calculate-cache-key-for-tree "^1.0.0"
@@ -3587,6 +3587,16 @@ micromatch@^3.0.4:
   version "1.33.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.33.0.tgz#a3492050a5cb9b63450541e39d9788d2272783db"
 
+mime-db@~1.36.0:
+  version "1.36.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.36.0.tgz#5020478db3c7fe93aad7bbcc4dcf869c43363397"
+
+mime-types@^2.1.18:
+  version "2.1.20"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.20.tgz#930cb719d571e903738520f8470911548ca2cc19"
+  dependencies:
+    mime-db "~1.36.0"
+
 mime-types@~2.1.11, mime-types@~2.1.16, mime-types@~2.1.18:
   version "2.1.18"
   resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.18.tgz#6f323f60a83d11146f831ff11fd66e2fe5503bb8"
@@ -3597,10 +3607,6 @@ mime@1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.4.1.tgz#121f9ebc49e3766f311a76e1fa1c8003c4b03aa6"
 
-mime@^1.2.11:
-  version "1.6.0"
-  resolved "https://registry.yarnpkg.com/mime/-/mime-1.6.0.tgz#32cd9e5c64553bd58d19a568af452acff04981b1"
-
 mimic-fn@^1.0.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"