diff --git a/CHANGELOG.md b/CHANGELOG.md
index a93be492443..28895c1ff51 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - added: Logbox disable option to env.json
 - added: Reverse-resolve recipient addresses to ENS / Unstoppable Domains / ZNS names in the send flow, address modal, and transaction history.
+- removed: SideShift `privateKey` from env config; the swap integration no longer sends the affiliate secret header.
 
 ## 4.49.0 (staging)
 
diff --git a/src/envConfig.ts b/src/envConfig.ts
index 149d1383f28..c255bda10f2 100644
--- a/src/envConfig.ts
+++ b/src/envConfig.ts
@@ -385,8 +385,7 @@ export const asEnvConfig = asObject({
   SEPOLIA_INIT: asCorePluginInit(asEvmApiKeys),
   SIDESHIFT_INIT: asCorePluginInit(
     asObject({
-      affiliateId: asOptional(asString, ''),
-      privateKey: asOptional(asString)
+      affiliateId: asOptional(asString, '')
     }).withRest
   ),
   SOLANA_INIT: asCorePluginInit(