Litecoin has released the latest version of Litecoin Core 0.18.1 and is recommended for everyone to upgrade which comes with new features, performance improvements, and various bug fixes.
This new major version release is supported on the Linux kernel, macOS 10.10+, and Windows 7 and newer. It should also work on most other Unix-like systems but is not as frequently tested on them.
In order to upgrade, you need to shut down the older version. Once it is completely shut down, you have to run the installer on Windows or copy /Applications/Litecoin-Qt on Mac or litecoind/litecoin-qt on Linux.
— Charlie Lee [LTC⚡] (@SatoshiLite) May 5, 2020
The issue in this version is with Wallet GUI as such is recommended not to use coin control features with multiple wallets loaded.
As for the notable changes, there have been new RPCs, configuration option changes, and when called to getblocktemplate, it will fail if segwit rule is not specified in relation to mining.
Also, when creating a fee above the default 0.1 LTC, as the feeRate argument is specified in LTC per kilobyte, not litoshi per byte, instead of rounding down the fee, the RPC commands, walletcreatefundedpsbt and fundrawtransaction will now fail.
Furthermore, in about next year, starting with Litecoin Core 0.20, Litecoin Core will default to native segwit addresses (bech32) to provide additional fee savings. If they see enough additional adoption, they will instead default to bech32 receiving addresses in Litecoin Core 0.20.
Mimblewimble Implementation Update
On May 1st, David Burkett, Grin++, and Litecoin developer posted April progress update on the Mimblewimble integration of Litecoin, claiming that a “functional testing framework” has been built.
Burkett has started integrating with the Litecoin codebase, which began with ConnectBlock logic that validates blocks before adding them to the chain, and has mostly completed end-to-end block validation tests.
Back in March, Burkett had predicted that the Mimblewimble would be running on the Litecoin testnet by the end of this summer.
As for Grin++, they have prepared to have the first non-beta version of Grin++.