# 0.21.0 [2020-08-18]
- Refactor the ping protocol for conformity by (re)using
a single substream for outbound pings, addressing
[#1601](https://github.com/libp2p/rust-libp2p/issues/1601).
- Bump `libp2p-core` and `libp2p-swarm` dependencies.
# 0.20.0 [2020-07-01]
- Updated dependencies.
# 0.19.3 [2020-06-22]
- Updated dependencies.
# 0.19.2 [2020-06-18]
- Close substream in inbound upgrade
[PR 1606](https://github.com/libp2p/rust-libp2p/pull/1606).