diff --git a/components/UserDropdown.tsx b/components/UserDropdown.tsx
index a42bdd93..9acf44f5 100644
--- a/components/UserDropdown.tsx
+++ b/components/UserDropdown.tsx
@@ -6,6 +6,21 @@ import { useTheme } from 'emotion-theming';
 import defaultTheme from './theme';
 import { Avatar, ChevronDown } from './theme/icons';
 import useAuthContext from '../global/hooks/useAuthContext';
+import { UserWithId } from '../global/types';
+
+const getDisplayName = (user?: UserWithId) => {
+  const greeting = 'Hello';
+  if (user) {
+    if (user.firstName) {
+      return `${greeting}, ${user.firstName}`;
+    } else if (user.lastName) {
+      return `${greeting}, ${user.lastName}`;
+    } else if (user.email) {
+      return `${greeting}, ${user.email}`;
+    }
+  }
+  return greeting;
+};
 
 const CurrentUser = () => {
   const { user } = useAuthContext();
@@ -30,7 +45,7 @@ const CurrentUser = () => {
           max-width: 142px;
         `}
       >
-        Hello, {user?.firstName}
+        {getDisplayName(user)}
       </span>
     </div>
   );
diff --git a/global/hooks/useAuthContext.tsx b/global/hooks/useAuthContext.tsx
index 00009936..5a9ff755 100644
--- a/global/hooks/useAuthContext.tsx
+++ b/global/hooks/useAuthContext.tsx
@@ -2,7 +2,7 @@ import React, { createContext, useState } from 'react';
 import { useRouter } from 'next/router';
 
 import { EGO_JWT_KEY } from '../utils/constants';
-import { decodeToken, extractUser, getPermissionsFromToken } from '../utils/egoTokenUtils';
+import { decodeToken, extractUser, isValidJwt } from '../utils/egoTokenUtils';
 import { UserWithId } from '../../global/types';
 
 type T_AuthContext = {
@@ -45,18 +45,20 @@ export const AuthProvider = ({
     setTokenState(egoJwt);
   }
 
-  const fetchWithAuth = (url: string, options: any) => {
+  if (token && !isValidJwt(token)) {
+    logout();
+  }
+
+  const fetchWithAuth: T_AuthContext['fetchWithAuth'] = (url, options) => {
     return fetch(url, {
       ...options,
-      headers: { ...options.headers, accept: '*/*', Authorization: `Bearer ${token || ''}` },
+      headers: { ...options?.headers, accept: '*/*', Authorization: `Bearer ${token || ''}` },
       body: null,
     });
   };
 
   const userInfo = token ? decodeToken(token) : null;
-  // ts error on userInfo from type discrepancy between dms and ego-token-utils user.preferredLanguage
-  // dms will need to use token-utils version updated for ego 4.x.x
-  const user = userInfo ? extractUser(userInfo) : {};
+  const user = userInfo ? extractUser(userInfo) : undefined;
   const authData = {
     token,
     logout,
diff --git a/global/utils/egoTokenUtils.ts b/global/utils/egoTokenUtils.ts
index e77c91f8..fa21c756 100644
--- a/global/utils/egoTokenUtils.ts
+++ b/global/utils/egoTokenUtils.ts
@@ -1,20 +1,35 @@
-import createEgoUtils from '@icgc-argo/ego-token-utils';
+import jwtDecode from 'jwt-decode';
 import { memoize } from 'lodash';
+import jwt from 'jsonwebtoken';
 
 import { getConfig } from '../config';
 import { EgoJwtData, UserWithId } from '../types';
 
-const TokenUtils = createEgoUtils(getConfig().NEXT_PUBLIC_EGO_PUBLIC_KEY);
+const { NEXT_PUBLIC_EGO_PUBLIC_KEY } = getConfig();
 
-export const isValidJwt = (egoJwt: string | undefined) => !!egoJwt && TokenUtils.isValidJwt(egoJwt);
+const verifyJwt: (egoPublicKey: string) => (egoJwt?: string) => boolean = (egoPublicKey) => (
+  egoJwt,
+) => {
+  try {
+    if (!egoJwt || !egoPublicKey) {
+      return false;
+    } else {
+      return jwt.verify(egoJwt, egoPublicKey, { algorithms: ['RS256'] }) && true;
+    }
+  } catch (err) {
+    return false;
+  }
+};
+
+export const isValidJwt = verifyJwt(NEXT_PUBLIC_EGO_PUBLIC_KEY);
 
-export const decodeToken = memoize((egoJwt?: string) =>
-  egoJwt ? TokenUtils.decodeToken(egoJwt) : null,
+export const decodeToken: (egoJwt?: string) => EgoJwtData | null = memoize((egoJwt) =>
+  egoJwt && isValidJwt(egoJwt) ? jwtDecode(egoJwt) : null,
 );
 
-export const extractUser: (decodedToken: EgoJwtData) => UserWithId | {} = (decodedToken) => {
+export const extractUser: (decodedToken: EgoJwtData) => UserWithId | undefined = (decodedToken) => {
   if (decodedToken) {
     return { ...decodedToken?.context.user, id: decodedToken?.sub };
   }
-  return {};
+  return undefined;
 };
diff --git a/next-env.d.ts b/next-env.d.ts
index 96f65894..c6c4e86f 100644
--- a/next-env.d.ts
+++ b/next-env.d.ts
@@ -3,3 +3,4 @@
 
 declare module 'url-join';
 declare module 'js-cookie';
+declare module 'jsonwebtoken';
diff --git a/package-lock.json b/package-lock.json
index 62a9e5ad..36500d34 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1708,14 +1708,6 @@
       "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.1.1.tgz",
       "integrity": "sha512-CAEbWH7OIur6jEOzaai83jq3FmKmv4PmX1JYfs9IrYcGEVI/lyL1EXJGCj7eFVJ0bg5QR8LMxBlEtA+xKiLpFw=="
     },
-    "@icgc-argo/ego-token-utils": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/@icgc-argo/ego-token-utils/-/ego-token-utils-8.0.0.tgz",
-      "integrity": "sha512-sgBHslKS3TnSSCNcdOpwrophLRrZitVpnussv4iRD0VKn6OFCfR32AXn+Ri9LF6KifS3FsE1WtvAYNJx1Ewz7g==",
-      "requires": {
-        "jsonwebtoken": "^8.5.1"
-      }
-    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -8421,6 +8413,11 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "jwt-decode": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/jwt-decode/-/jwt-decode-3.1.2.tgz",
+      "integrity": "sha512-UfpWE/VZn0iP50d8cz9NrZLM9lSWhcJ+0Gt/nm4by88UL+J1SiKN8/5dkjMmbEzwL2CAe+67GsegCbIKtbp75A=="
+    },
     "kind-of": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.3.tgz",
diff --git a/package.json b/package.json
index 70b59ac7..5aec78ef 100644
--- a/package.json
+++ b/package.json
@@ -13,11 +13,12 @@
     "@emotion/babel-preset-css-prop": "^10.0.27",
     "@emotion/core": "^10.0.35",
     "@emotion/styled": "^10.0.27",
-    "@icgc-argo/ego-token-utils": "^8.0.0",
     "@types/lodash": "^4.14.168",
     "@zeit/next-css": "^1.0.1",
     "axios": "^0.21.1",
     "emotion-theming": "^10.0.27",
+    "jsonwebtoken": "^8.5.1",
+    "jwt-decode": "^3.1.2",
     "lodash": "^4.17.20",
     "next": "^9.5.4",
     "query-string": "^6.13.8",