diff --git a/app/scripts/lockdown-more.js b/app/scripts/lockdown-more.js
index e6637602a..317052312 100644
--- a/app/scripts/lockdown-more.js
+++ b/app/scripts/lockdown-more.js
@@ -28,7 +28,7 @@ try {
     const namedIntrinsics = Reflect.ownKeys(new Compartment().globalThis);
 
     // These named intrinsics are not automatically hardened by `lockdown`
-    const shouldHardenManually = new Set(['eval', 'Function']);
+    const shouldHardenManually = new Set(['eval', 'Function', 'Symbol']);
 
     const globalProperties = new Set([
       // universalPropertyNames is a constant added by lockdown to global scope
diff --git a/package.json b/package.json
index 59aedf671..a5696c96a 100644
--- a/package.json
+++ b/package.json
@@ -358,7 +358,7 @@
     "redux-thunk": "^2.3.0",
     "remove-trailing-slash": "^0.1.1",
     "reselect": "^3.0.1",
-    "ses": "^0.18.4",
+    "ses": "^0.18.7",
     "single-call-balance-checker-abi": "^1.0.0",
     "unicode-confusables": "^0.1.1",
     "uuid": "^8.3.2",
diff --git a/yarn.lock b/yarn.lock
index 5f6089519..b8a2760b1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1864,6 +1864,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@endo/env-options@npm:^0.1.3":
+  version: 0.1.3
+  resolution: "@endo/env-options@npm:0.1.3"
+  checksum: dbaa1c6edf2de712b0af76c991f2ffd29e52a27d3adca2292531dbbf42ef0541c03daa4d7f2de3efb223d0cacf303c82fe88c19d44a0f5535dce9ccbe5f66138
+  languageName: node
+  linkType: hard
+
 "@ensdomains/address-encoder@npm:^0.1.7":
   version: 0.1.9
   resolution: "@ensdomains/address-encoder@npm:0.1.9"
@@ -24521,7 +24528,7 @@ __metadata:
     selenium-webdriver: "npm:^4.9.0"
     semver: "npm:^7.5.4"
     serve-handler: "npm:^6.1.2"
-    ses: "npm:^0.18.4"
+    ses: "npm:^0.18.7"
     single-call-balance-checker-abi: "npm:^1.0.0"
     sinon: "npm:^9.0.0"
     source-map: "npm:^0.7.2"
@@ -30935,10 +30942,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ses@npm:^0.18.1, ses@npm:^0.18.4":
-  version: 0.18.4
-  resolution: "ses@npm:0.18.4"
-  checksum: 377d2a898816fe2651fe4cff3832f52efb7f0649a9e439b89d0f39f9d15279fb5bb6aadf85759af6768da43e9dbe096d2e39697d66171412c87f3acf09fcbc30
+"ses@npm:^0.18.1, ses@npm:^0.18.7":
+  version: 0.18.7
+  resolution: "ses@npm:0.18.7"
+  dependencies:
+    "@endo/env-options": "npm:^0.1.3"
+  checksum: 601b442426bb8113bb855548878771aacb62f3c4eb3c45ff32f70338320f03eeb23c0d7eb834f5539793fa8ce497f304db50cbd5da51ef3531a4e94d424bb98c
   languageName: node
   linkType: hard