diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 279f8c2914a..e640e0532dc 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -1,4 +1,3 @@
-
 # Copyright 2020-2021 Signal Messenger, LLC
 # SPDX-License-Identifier: AGPL-3.0-only
 
@@ -26,7 +25,7 @@ jobs:
       with:
         repository: 'signalapp/Mock-Signal-Server-Private'
         path: 'Mock-Server'
-        ref: 'main'
+        ref: 'alpha'
         token: ${{ secrets.AUTOMATED_GITHUB_PAT }}
 
     - name: Setup node.js
diff --git a/config/default.json b/config/default.json
index 338d64cab0c..5e14456b14b 100644
--- a/config/default.json
+++ b/config/default.json
@@ -19,6 +19,6 @@
   "buildExpiration": 0,
   "certificateAuthority": "-----BEGIN CERTIFICATE-----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\nrwLV\n-----END CERTIFICATE-----\n",
   "import": false,
-  "serverPublicParams": "ABSY21VckQcbSXVNCGRYJcfWHiAMZmpTtTELcDmxgdFbtp/bWsSxZdMKzfCp8rvIs8ocCU3B37fT3r4Mi5qAemeGeR2X+/YmOGR5ofui7tD5mDQfstAI9i+4WpMtIe8KC3wU5w3Inq3uNWVmoGtpKndsNfwJrCg0Hd9zmObhypUnSkfYn2ooMOOnBpfdanRtrvetZUayDMSC5iSRcXKpdls=",
+  "serverPublicParams": "ABSY21VckQcbSXVNCGRYJcfWHiAMZmpTtTELcDmxgdFbtp/bWsSxZdMKzfCp8rvIs8ocCU3B37fT3r4Mi5qAemeGeR2X+/YmOGR5ofui7tD5mDQfstAI9i+4WpMtIe8KC3wU5w3Inq3uNWVmoGtpKndsNfwJrCg0Hd9zmObhypUnSkfYn2ooMOOnBpfdanRtrvetZUayDMSC5iSRcXKpdlukrpzzsCIvEwjwQlJYVPOQPj4V0F4UXXBdHSLK05uoPBCQG8G9rYIGedYsClJXnbrgGYG3eMTG5hnx4X4ntARB",
   "serverTrustRoot": "BbqY1DzohE4NUZoVF+L18oUPrK3kILllLEJh2UnPSsEx"
 }
diff --git a/config/production.json b/config/production.json
index d1f16aae57d..9055eb1848c 100644
--- a/config/production.json
+++ b/config/production.json
@@ -6,7 +6,7 @@
     "0": "https://cdn.signal.org",
     "2": "https://cdn2.signal.org"
   },
-  "serverPublicParams": "AMhf5ywVwITZMsff/eCyudZx9JDmkkkbV6PInzG4p8x3VqVJSFiMvnvlEKWuRob/1eaIetR31IYeAbm0NdOuHH8Qi+Rexi1wLlpzIo1gstHWBfZzy1+qHRV5A4TqPp15YzBPm0WSggW6PbSn+F4lf57VCnHF7p8SvzAA2ZZJPYJURt8X7bbg+H3i+PEjH9DXItNEqs2sNcug37xZQDLm7X0=",
+  "serverPublicParams": "AMhf5ywVwITZMsff/eCyudZx9JDmkkkbV6PInzG4p8x3VqVJSFiMvnvlEKWuRob/1eaIetR31IYeAbm0NdOuHH8Qi+Rexi1wLlpzIo1gstHWBfZzy1+qHRV5A4TqPp15YzBPm0WSggW6PbSn+F4lf57VCnHF7p8SvzAA2ZZJPYJURt8X7bbg+H3i+PEjH9DXItNEqs2sNcug37xZQDLm7X36nOoGPs54XsEGzPdEV+itQNGUFEjY6X9Uv+Acuks7NpyGvCoKxGwgKgE5XyJ+nNKlyHHOLb6N1NuHyBrZrgtY",
   "serverTrustRoot": "BXu6QIKVz5MA8gstzfOgRQGqyLqOwNKHL6INkv3IHWMF",
   "updatesEnabled": true
 }
diff --git a/package.json b/package.json
index 99eb4575ee5..b1e2b6d805d 100644
--- a/package.json
+++ b/package.json
@@ -163,7 +163,7 @@
     "underscore": "1.12.1",
     "uuid": "3.3.2",
     "websocket": "1.0.28",
-    "zkgroup": "https://github.com/signalapp/signal-zkgroup-node.git#3bb62fa44dc69560436a8c946ea48630f3230ed3",
+    "zkgroup": "https://github.com/signalapp/signal-zkgroup-node.git#4864f2f50a363bdf0147158e52aa1d93a9e70633",
     "zod": "3.5.1"
   },
   "devDependencies": {
diff --git a/ts/background.ts b/ts/background.ts
index 4aeddbc2b0e..c6700831f36 100644
--- a/ts/background.ts
+++ b/ts/background.ts
@@ -31,6 +31,7 @@ import { normalizeUuid } from './util/normalizeUuid';
 import { filter } from './util/iterables';
 import { isNotNil } from './util/isNotNil';
 import { senderCertificateService } from './services/senderCertificate';
+import { GROUP_CREDENTIALS_KEY } from './services/groupCredentialFetcher';
 import { routineProfileRefresh } from './routineProfileRefresh';
 import { isMoreRecentThan, isOlderThan, toDayMillis } from './util/timestamp';
 import { isValidReactionEmoji } from './reactions/isValidReactionEmoji';
@@ -769,6 +770,10 @@ export async function startApp(): Promise<void> {
         await window.storage.remove('senderCertificateNoE164');
       }
 
+      if (window.isBeforeVersion(lastVersion, 'v5.19.0')) {
+        await window.storage.remove(GROUP_CREDENTIALS_KEY);
+      }
+
       // This one should always be last - it could restart the app
       if (window.isBeforeVersion(lastVersion, 'v1.15.0-beta.5')) {
         await deleteAllLogs();
diff --git a/yarn.lock b/yarn.lock
index 8eb5a0ea266..aca5c1e7600 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -19177,9 +19177,9 @@ zip-stream@^1.2.0:
     lodash "^4.8.0"
     readable-stream "^2.0.0"
 
-"zkgroup@https://github.com/signalapp/signal-zkgroup-node.git#3bb62fa44dc69560436a8c946ea48630f3230ed3":
-  version "0.7.3"
-  resolved "https://github.com/signalapp/signal-zkgroup-node.git#3bb62fa44dc69560436a8c946ea48630f3230ed3"
+"zkgroup@https://github.com/signalapp/signal-zkgroup-node.git#4864f2f50a363bdf0147158e52aa1d93a9e70633":
+  version "0.8.1"
+  resolved "https://github.com/signalapp/signal-zkgroup-node.git#4864f2f50a363bdf0147158e52aa1d93a9e70633"
   dependencies:
     "@types/ffi-napi" "^4.0.1"
     "@types/ref-napi" "^3.0.1"