diff --git a/CHANGELOG.md b/CHANGELOG.md
index b04877ee4..1e5aa7264 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## master
+
+- Sync with upstream Substrate ss58 registry
+
 ## 7.4.1 Sep 17, 2021
 
 Changes:
diff --git a/packages/networks/src/substrate.ts b/packages/networks/src/substrate.ts
index 5300bde19..81d619c3e 100644
--- a/packages/networks/src/substrate.ts
+++ b/packages/networks/src/substrate.ts
@@ -533,6 +533,15 @@ export const knownSubstrate: KnownSubstrate[] = [
     symbols: ['KMA'],
     website: 'https://manta.network'
   },
+  {
+    decimals: [12],
+    displayName: 'Polkadex Mainnet',
+    network: 'polkadex',
+    prefix: 88,
+    standardAccount: '*25519',
+    symbols: ['PDEX'],
+    website: 'https://polkadex.trade'
+  },
   {
     decimals: [18],
     displayName: 'PolkaSmith Canary Network',