diff --git a/package.json b/package.json
index e22436a006..3e6fb6e44d 100644
--- a/package.json
+++ b/package.json
@@ -103,7 +103,7 @@
   "devDependencies": {
     "async": "^2.0.1",
     "bower": "^1.8.8",
-    "chai": "^3.4.1",
+    "chai": "^4.3.6",
     "css-loader": "^0.23.1",
     "del": "^2.0.1",
     "eslint": "^3.2.2",
diff --git a/yarn.lock b/yarn.lock
index 78d6ceae67..a7ad858694 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -608,9 +608,10 @@ assert@^1.1.1:
   dependencies:
     util "0.10.3"
 
-assertion-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.0.2.tgz#13ca515d86206da0bac66e834dd397d87581094c"
+assertion-error@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
+  integrity sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==
 
 assign-symbols@^1.0.0:
   version "1.0.0"
@@ -1377,13 +1378,18 @@ center-align@^0.1.1:
     align-text "^0.1.3"
     lazy-cache "^1.0.3"
 
-chai@^3.4.1:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-3.5.0.tgz#4d02637b067fe958bdbfdd3a40ec56fef7373247"
+chai@^4.3.6:
+  version "4.3.6"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.6.tgz#ffe4ba2d9fa9d6680cc0b370adae709ec9011e9c"
+  integrity sha512-bbcp3YfHCUzMOvKqsztczerVgBKSsEijCySNlHHbX3VG1nskvqjz5Rfso1gGwD6w6oOV3eI60pKuMOV5MV7p3Q==
   dependencies:
-    assertion-error "^1.0.1"
-    deep-eql "^0.1.3"
-    type-detect "^1.0.0"
+    assertion-error "^1.1.0"
+    check-error "^1.0.2"
+    deep-eql "^3.0.1"
+    get-func-name "^2.0.0"
+    loupe "^2.3.1"
+    pathval "^1.1.1"
+    type-detect "^4.0.5"
 
 chainsaw@~0.1.0:
   version "0.1.0"
@@ -1424,6 +1430,11 @@ character-parser@^2.1.1:
   dependencies:
     is-regex "^1.0.3"
 
+check-error@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.2.tgz#574d312edd88bb5dd8912e9286dd6c0aed4aac82"
+  integrity sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=
+
 cheerio@~0.19.0:
   version "0.19.0"
   resolved "https://registry.yarnpkg.com/cheerio/-/cheerio-0.19.0.tgz#772e7015f2ee29965096d71ea4175b75ab354925"
@@ -2333,11 +2344,12 @@ decompress-response@^4.2.0:
   dependencies:
     mimic-response "^2.0.0"
 
-deep-eql@^0.1.3:
-  version "0.1.3"
-  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-0.1.3.tgz#ef558acab8de25206cd713906d74e56930eb69f2"
+deep-eql@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-3.0.1.tgz#dfc9404400ad1c8fe023e7da1df1c147c4b444df"
+  integrity sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==
   dependencies:
-    type-detect "0.1.1"
+    type-detect "^4.0.0"
 
 deep-equal@^1.0.1:
   version "1.1.1"
@@ -3776,6 +3788,11 @@ get-caller-file@^2.0.1, get-caller-file@^2.0.5:
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-2.0.5.tgz#4f94412a82db32f36e3b0b9741f8a97feb031f7e"
   integrity sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==
 
+get-func-name@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.0.tgz#ead774abee72e20409433a066366023dd6887a41"
+  integrity sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=
+
 get-intrinsic@^1.0.2:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/get-intrinsic/-/get-intrinsic-1.1.1.tgz#15f59f376f855c446963948f0d24cd3637b4abc6"
@@ -6042,6 +6059,13 @@ loud-rejection@^1.0.0:
     currently-unhandled "^0.4.1"
     signal-exit "^3.0.0"
 
+loupe@^2.3.1:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/loupe/-/loupe-2.3.1.tgz#a2e1192c9f452e4e85089766da10ac8288383947"
+  integrity sha512-EN1D3jyVmaX4tnajVlfbREU4axL647hLec1h/PXAb8CPDMJiYitcWF2UeLVNttRqaIqQs4x+mRvXf+d+TlDrCA==
+  dependencies:
+    get-func-name "^2.0.0"
+
 lower-case@^1.1.1:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/lower-case/-/lower-case-1.1.4.tgz#9a2cabd1b9e8e0ae993a4bf7d5875c39c42e8eac"
@@ -7353,6 +7377,11 @@ path@^0.12.7:
     process "^0.11.1"
     util "^0.10.3"
 
+pathval@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.1.tgz#8534e77a77ce7ac5a2512ea21e0fdb8fcf6c3d8d"
+  integrity sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==
+
 pause-stream@0.0.11:
   version "0.0.11"
   resolved "https://registry.yarnpkg.com/pause-stream/-/pause-stream-0.0.11.tgz#fe5a34b0cbce12b5aa6a2b403ee2e73b602f1445"
@@ -10038,13 +10067,10 @@ type-check@~0.3.2:
   dependencies:
     prelude-ls "~1.1.2"
 
-type-detect@0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-0.1.1.tgz#0ba5ec2a885640e470ea4e8505971900dac58822"
-
-type-detect@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-1.0.0.tgz#762217cc06db258ec48908a1298e8b95121e8ea2"
+type-detect@^4.0.0, type-detect@^4.0.5:
+  version "4.0.8"
+  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"
+  integrity sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==
 
 type-is@^1.6.4, type-is@^1.6.9, type-is@~1.6.15, type-is@~1.6.17, type-is@~1.6.18:
   version "1.6.18"