diff --git a/packages/react-native/scripts/cocoapods/utils.rb b/packages/react-native/scripts/cocoapods/utils.rb
index ace3848aa84..dcb15c397d0 100644
--- a/packages/react-native/scripts/cocoapods/utils.rb
+++ b/packages/react-native/scripts/cocoapods/utils.rb
@@ -541,7 +541,8 @@ class ReactNativePodsUtils
                     "NSAppTransportSecurity" => ats_configs
                 }
             else
-                plist["NSAppTransportSecurity"] = ats_configs
+                plist["NSAppTransportSecurity"] ||= {}
+                plist["NSAppTransportSecurity"] = plist["NSAppTransportSecurity"].merge(ats_configs)
             end
             Xcodeproj::Plist.write_to_path(plist, fullPlistPath)
         end