diff --git a/backend/package.json b/backend/package.json
index 9e4a735..4799026 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -9,7 +9,7 @@
     "body-parser": "^1.18.3",
     "cors": "^2.8.4",
     "express": "^4.16.3",
-    "jsonwebtoken": "^8.3.0",
+    "jsonwebtoken": "^9.0.0",
     "mongoose": "^5.2.5",
     "morgan": "^1.9.0",
     "passport": "^0.4.0",
diff --git a/backend/yarn.lock b/backend/yarn.lock
index 50b68a2..0ce996a 100644
--- a/backend/yarn.lock
+++ b/backend/yarn.lock
@@ -120,9 +120,9 @@ destroy@~1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/destroy/-/destroy-1.0.4.tgz#978857442c44749e4206613e37946205826abd80"
 
-ecdsa-sig-formatter@1.0.10:
-  version "1.0.10"
-  resolved "https://registry.yarnpkg.com/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.10.tgz#1c595000f04a8897dfb85000892a0f4c33af86c3"
+ecdsa-sig-formatter@1.0.11:
+  version "1.0.11"
+  resolved "https://registry.yarnpkg.com/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz#ae0f0fa2d85045ef14a817daa3ce9acd0489e5bf"
   dependencies:
     safe-buffer "^5.0.1"
 
@@ -233,7 +233,7 @@ ipaddr.js@1.8.0:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.8.0.tgz#eaa33d6ddd7ace8f7f6fe0c9ca0440e706738b1e"
 
-jsonwebtoken@^8.2.0, jsonwebtoken@^8.3.0:
+jsonwebtoken@^8.2.0:
   version "8.3.0"
   resolved "https://registry.yarnpkg.com/jsonwebtoken/-/jsonwebtoken-8.3.0.tgz#056c90eee9a65ed6e6c72ddb0a1d325109aaf643"
   dependencies:
@@ -247,19 +247,28 @@ jsonwebtoken@^8.2.0, jsonwebtoken@^8.3.0:
     lodash.once "^4.0.0"
     ms "^2.1.1"
 
-jwa@^1.1.5:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/jwa/-/jwa-1.1.6.tgz#87240e76c9808dbde18783cf2264ef4929ee50e6"
+jsonwebtoken@^9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/jsonwebtoken/-/jsonwebtoken-9.0.0.tgz#d0faf9ba1cc3a56255fe49c0961a67e520c1926d"
+  dependencies:
+    jws "^3.2.2"
+    lodash "^4.17.21"
+    ms "^2.1.1"
+    semver "^7.3.8"
+
+jwa@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/jwa/-/jwa-1.4.1.tgz#743c32985cb9e98655530d53641b66c8645b039a"
   dependencies:
     buffer-equal-constant-time "1.0.1"
-    ecdsa-sig-formatter "1.0.10"
+    ecdsa-sig-formatter "1.0.11"
     safe-buffer "^5.0.1"
 
-jws@^3.1.5:
-  version "3.1.5"
-  resolved "https://registry.yarnpkg.com/jws/-/jws-3.1.5.tgz#80d12d05b293d1e841e7cb8b4e69e561adcf834f"
+jws@^3.1.5, jws@^3.2.2:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/jws/-/jws-3.2.2.tgz#001099f3639468c9414000e99995fa52fb478304"
   dependencies:
-    jwa "^1.1.5"
+    jwa "^1.4.1"
     safe-buffer "^5.0.1"
 
 kareem@2.2.1:
@@ -298,9 +307,15 @@ lodash.once@^4.0.0:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/lodash.once/-/lodash.once-4.1.1.tgz#0dd3971213c7c56df880977d504c88fb471a97ac"
 
-lodash@^4.17.10:
-  version "4.17.10"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+lodash@^4.17.10, lodash@^4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+
+lru-cache@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-6.0.0.tgz#6d6fe6570ebd96aaf90fcad1dafa3b2566db3a94"
+  dependencies:
+    yallist "^4.0.0"
 
 media-typer@0.3.0:
   version "0.3.0"
@@ -515,6 +530,12 @@ semver@^5.1.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
 
+semver@^7.3.8:
+  version "7.3.8"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.8.tgz#07a78feafb3f7b32347d725e33de7e2a2df67798"
+  dependencies:
+    lru-cache "^6.0.0"
+
 send@0.16.2:
   version "0.16.2"
   resolved "https://registry.yarnpkg.com/send/-/send-0.16.2.tgz#6ecca1e0f8c156d141597559848df64730a6bbc1"
@@ -584,3 +605,7 @@ utils-merge@1.0.1:
 vary@^1, vary@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.2.tgz#2299f02c6ded30d4a5961b0b9f74524a18f634fc"
+
+yallist@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-4.0.0.tgz#9bb92790d9c0effec63be73519e11a35019a3a72"