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@@ -164,6 +164,6 @@ This metadata can be selectively exposed by the IC and used by tools such as `df
## Upgrading a deployed actor or canister smart contract
After you have deployed a Motoko actor with the appropriate `stable` variables or `preupgrade` and `postupgrade` system methods, you can use the `dfx canister install` command with the `--mode=upgrade` option to upgrade an already deployed version. For information about upgrading a deployed canister, see [Upgrade a canister smart contract](/docs/current/developer-docs/smart-contracts/upgrade).
After you have deployed a Motoko actor with the appropriate `stable` variables or `preupgrade` and `postupgrade` system methods, you can use the `dfx canister install` command with the `--mode=upgrade` option to upgrade an already deployed version. For information about upgrading a deployed canister, see [Upgrade a canister smart contract](/docs/current/developer-docs/smart-contracts/maintain/upgrade).
An upcoming version of `dfx` will, if appropriate, check the safety of an upgrade by comparing the Candid and (for Motoko canisters only) the stable signatures embedded in the deployed binary and upgrade binary, and abort the upgrade request when unsafe.
