diff --git a/CHANGELOG.md b/CHANGELOG.md
index 701f221b0..76aa51de2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,36 @@
 # Lotus changelog
 
+# 1.0.0 / 2020-10-19
+
+It's 1.0.0! This is an optional release of Lotus that introduces some UX improvements to the 0.10 series.
+
+This very small release is largely cosmetic, and intended to flag the code that the Filecoin mainnet was launched with.
+
+## API changes
+
+- `StateMsgGasCost` has been removed. The equivalent information can be gained by calling `StateReplay`.
+- A `GasCost` field has been added to the `InvocResult` type, meaning detailed gas costs will be returned when calling `StateReplay`, `StateCompute`, and `StateCall`.
+- The behaviour of `StateReplay` in response to an empty tipset key has been changed. Instead of simply using the heaviest tipset (which is almost guaranteed to be an unsuccessful replay), we search now search the chain for the tipset that included the message, and replay the message in that tipset (we fail if no such tipset is found).
+
+## Changes
+
+- Increase code coverage! (https://github.com/filecoin-project/lotus/pull/4410)
+- Mpool: Don't block node startup loading messages (https://github.com/filecoin-project/lotus/pull/4411)
+- Improve the UX of multisig approves (https://github.com/filecoin-project/lotus/pull/4398)
+- Use build.BlockDelaySecs for deal start buffer (https://github.com/filecoin-project/lotus/pull/4415)
+- Conformance: support multiple protocol versions (https://github.com/filecoin-project/lotus/pull/4393)
+- Ensure msig inspect cli works with lotus-lite (https://github.com/filecoin-project/lotus/pull/4421)
+- Add command to (slowly) prune lotus chain datastore (https://github.com/filecoin-project/lotus/pull/3876)
+- Add WalletVerify to lotus-gateway (https://github.com/filecoin-project/lotus/pull/4373)
+- Improve StateMsg APIs (https://github.com/filecoin-project/lotus/pull/4429)
+- Add endpoints needed by spacegap (https://github.com/filecoin-project/lotus/pull/4426)
+- Make audit balances capable of printing robust addresses (https://github.com/filecoin-project/lotus/pull/4423)
+- Custom filters for retrieval deals (https://github.com/filecoin-project/lotus/pull/4424)
+- Fix message list api (https://github.com/filecoin-project/lotus/pull/4422)
+- Replace bootstrap peers (https://github.com/filecoin-project/lotus/pull/4447)
+- Don't overwrite previously-configured maxPieceSize for a persisted ask (https://github.com/filecoin-project/lotus/pull/4480)
+- State: optimize state snapshot address cache (https://github.com/filecoin-project/lotus/pull/4481)
+
 # 0.10.2 / 2020-10-14
 
 This is an optional release of Lotus that updates markets to 0.9.1, which fixes an issue affecting deals that were mid-transfer when the node was upgraded to 0.9.0. This release also includes some tweaks to default gas values and minor performance improvements.
diff --git a/build/version.go b/build/version.go
index df1fe28de..352fa9b0e 100644
--- a/build/version.go
+++ b/build/version.go
@@ -29,7 +29,7 @@ func buildType() string {
 }
 
 // BuildVersion is the local build version, set by build system
-const BuildVersion = "0.10.2"
+const BuildVersion = "1.0.0"
 
 func UserVersion() string {
 	return BuildVersion + buildType() + CurrentCommit