diff --git a/package-lock.json b/package-lock.json
index 725754df..c4995fc8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2545,13 +2545,21 @@
       }
     },
     "@relaycorp/ws-mock": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/@relaycorp/ws-mock/-/ws-mock-2.0.3.tgz",
-      "integrity": "sha512-D0ssLvK0n+7iON/ifrZxrB4HR0E4cd8e/MDqbMPFaZRcW/hpCBmp95xCT2hUMhQh1jH5FMBViCQxlumjU5LKqw==",
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/@relaycorp/ws-mock/-/ws-mock-2.4.1.tgz",
+      "integrity": "sha512-J0zctRQAv40MzswlJZTVVuzdF75x/Lq0SFTfIsjj815uowtvdHjMGtnTk//DLT+eg6oxOMX8IIGnS5jHVA4ZLQ==",
       "dev": true,
       "requires": {
         "buffer-to-arraybuffer": "0.0.6",
-        "ws": "^7.5.0"
+        "ws": "^7.5.3"
+      },
+      "dependencies": {
+        "ws": {
+          "version": "7.5.3",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.3.tgz",
+          "integrity": "sha512-kQ/dHIzuLrS6Je9+uv81ueZomEwH0qVYstcAQ4/Z93K8zeko9gtAbttJWzoC5ukqXY1PpoouV3+VSOqEAFt5wg==",
+          "dev": true
+        }
       }
     },
     "@semantic-release/commit-analyzer": {
diff --git a/package.json b/package.json
index 6c31cd7f..60d8fa01 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
   "devDependencies": {
     "@relaycorp/relaynet-testing": "^1.3.0",
     "@relaycorp/shared-config": "^1.5.0",
-    "@relaycorp/ws-mock": "^2.0.3",
+    "@relaycorp/ws-mock": "^2.4.1",
     "@types/jest": "^26.0.23",
     "@types/verror": "^1.10.5",
     "@types/ws": "^7.4.1",