# UMIP 156 - Upgrade Polygon Oracle Tunnel

**URL:** <https://discourse.uma.xyz/t/umip-156-upgrade-polygon-oracle-tunnel/1587>\
**Category:** technical UMIPs\
**Created:** [April 1, 2022, 8:17pm UTC](https://discourse.uma.xyz/t/umip-156-upgrade-polygon-oracle-tunnel/1587 "2022-04-01T20:17:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mhairi](https://yyz2.discourse-cdn.com/flex032/user_avatar/discourse.uma.xyz/mhairi/32/48_2.png) [@Mhairi](https://discourse.uma.xyz/u/Mhairi)\
**Post date:** [April 1, 2022, 8:17pm UTC](https://discourse.uma.xyz/t/umip-156-upgrade-polygon-oracle-tunnel/1587/1 "2022-04-01T20:17:43Z")

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This UMIP will have the effect of registering an oracle root tunnel contract that will enable the optimistic oracle deployed on Polygon to make cross-chain price requests to the DVM on mainnet Ethereum.

> <https://github.com/UMAprotocol/UMIPs/pull/504>

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<div class="post-metadata">

**Author:** ![Mhairi](https://yyz2.discourse-cdn.com/flex032/user_avatar/discourse.uma.xyz/mhairi/32/48_2.png) [@Mhairi](https://discourse.uma.xyz/u/Mhairi)\
**Post date:** [April 4, 2022, 9:31pm UTC](https://discourse.uma.xyz/t/umip-156-upgrade-polygon-oracle-tunnel/1587/2 "2022-04-04T21:31:51Z")

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**Community Review Call outcome - 4th April**

GO