diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3de2157..97c3dfb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,20 @@
 # Changelog
 
-## 0.19.10
+## 0.20.0
+
+*June 6th, 2018*
+
+BREAKING CHANGES
+
+- [abci] Upgrade to
+  [v0.11.0](https://github.com/tendermint/abci/blob/master/CHANGELOG.md#0110)
+
+NOTE: this release does not break any blockchain data structures or
+protocols other than the ABCI messages between Tendermint and the application.
+
+Applications that upgrade for ABCI v0.11.0 should be able to continue running Tendermint
+v0.20.0 on blockchains created with v0.19.X
 
-*TBD*
 
 ## 0.19.9
 
diff --git a/Gopkg.lock b/Gopkg.lock
index 20ae605a..f21e3842 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -238,8 +238,8 @@
     "server",
     "types"
   ]
-  revision = "7cf66f570e2f47b286985e2d688b0a400c028e4c"
-  version = "v0.11.0-rc6"
+  revision = "ebee2fe114020aa49c70bbbae50b7079fc7e7b90"
+  version = "v0.11.0"
 
 [[projects]]
   branch = "master"
@@ -313,7 +313,7 @@
   branch = "master"
   name = "golang.org/x/sys"
   packages = ["unix"]
-  revision = "c11f84a56e43e20a78cee75a7c034031ecf57d1f"
+  revision = "9527bec2660bd847c050fda93a0f0c6dee0800bb"
 
 [[projects]]
   name = "golang.org/x/text"
@@ -374,6 +374,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "132980da98fc92b6c0dd988df07316a340f5fc91ee77593cf984ade4e3e5fd62"
+  inputs-digest = "ae6792578b0664708339f4c05e020687d6b799ad6f8282394b919de69e403d1f"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
index f95fb296..77a6af9b 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -71,7 +71,7 @@
 
 [[constraint]]
   name = "github.com/tendermint/abci"
-  version = "~0.11.0-rc6"
+  version = "~0.11.0"
 
 [[constraint]]
   name = "github.com/tendermint/go-crypto"
diff --git a/consensus/replay.go b/consensus/replay.go
index b30a1f15..c0c300b3 100644
--- a/consensus/replay.go
+++ b/consensus/replay.go
@@ -267,17 +267,31 @@ func (h *Handshaker) ReplayBlocks(state sm.State, appHash []byte, appBlockHeight
 	// If appBlockHeight == 0 it means that we are at genesis and hence should send InitChain
 	if appBlockHeight == 0 {
 		validators := types.TM2PB.Validators(state.Validators)
+		csParams := types.TM2PB.ConsensusParams(h.genDoc.ConsensusParams)
 		req := abci.RequestInitChain{
 			Time:            h.genDoc.GenesisTime.Unix(), // TODO
 			ChainId:         h.genDoc.ChainID,
-			ConsensusParams: types.TM2PB.ConsensusParams(h.genDoc.ConsensusParams),
+			ConsensusParams: csParams,
 			Validators:      validators,
 			AppStateBytes:   h.genDoc.AppStateJSON,
 		}
-		_, err := proxyApp.Consensus().InitChainSync(req)
+		res, err := proxyApp.Consensus().InitChainSync(req)
 		if err != nil {
 			return nil, err
 		}
+
+		// update the state
+		if len(res.Validators) > 0 {
+			vals, err := types.PB2TM.Validators(res.Validators)
+			if err != nil {
+				return nil, err
+			}
+			state.Validators = types.NewValidatorSet(vals)
+		}
+		if res.ConsensusParams != nil {
+			// TODO
+		}
+		sm.SaveState(h.stateDB, state)
 	}
 
 	// First handle edge cases and constraints on the storeBlockHeight
diff --git a/consensus/replay_test.go b/consensus/replay_test.go
index 2836110c..725568ed 100644
--- a/consensus/replay_test.go
+++ b/consensus/replay_test.go
@@ -13,6 +13,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/tendermint/abci/example/kvstore"
@@ -634,3 +635,53 @@ func (bs *mockBlockStore) LoadBlockCommit(height int64) *types.Commit {
 func (bs *mockBlockStore) LoadSeenCommit(height int64) *types.Commit {
 	return bs.commits[height-1]
 }
+
+//----------------------------------------
+
+func TestInitChainUpdateValidators(t *testing.T) {
+	val, _ := types.RandValidator(true, 10)
+	vals := types.NewValidatorSet([]*types.Validator{val})
+	app := &initChainApp{vals: types.TM2PB.Validators(vals)}
+	clientCreator := proxy.NewLocalClientCreator(app)
+
+	config := ResetConfig("proxy_test_")
+	privVal := privval.LoadFilePV(config.PrivValidatorFile())
+	stateDB, state, store := stateAndStore(config, privVal.GetPubKey())
+
+	oldValAddr := state.Validators.Validators[0].Address
+
+	// now start the app using the handshake - it should sync
+	genDoc, _ := sm.MakeGenesisDocFromFile(config.GenesisFile())
+	handshaker := NewHandshaker(stateDB, state, store, genDoc)
+	proxyApp := proxy.NewAppConns(clientCreator, handshaker)
+	if err := proxyApp.Start(); err != nil {
+		t.Fatalf("Error starting proxy app connections: %v", err)
+	}
+	defer proxyApp.Stop()
+
+	// reload the state, check the validator set was updated
+	state = sm.LoadState(stateDB)
+
+	newValAddr := state.Validators.Validators[0].Address
+	expectValAddr := val.Address
+	assert.NotEqual(t, oldValAddr, newValAddr)
+	assert.Equal(t, newValAddr, expectValAddr)
+}
+
+func newInitChainApp(vals []abci.Validator) *initChainApp {
+	return &initChainApp{
+		vals: vals,
+	}
+}
+
+// returns the vals on InitChain
+type initChainApp struct {
+	abci.BaseApplication
+	vals []abci.Validator
+}
+
+func (ica *initChainApp) InitChain(req abci.RequestInitChain) abci.ResponseInitChain {
+	return abci.ResponseInitChain{
+		Validators: ica.vals,
+	}
+}
diff --git a/types/protobuf.go b/types/protobuf.go
index d1b0ae7f..730c6005 100644
--- a/types/protobuf.go
+++ b/types/protobuf.go
@@ -167,3 +167,19 @@ func (pb2tm) PubKey(pubKey abci.PubKey) (crypto.PubKey, error) {
 		return nil, fmt.Errorf("Unknown pubkey type %v", pubKey.Type)
 	}
 }
+
+func (pb2tm) Validators(vals []abci.Validator) ([]*Validator, error) {
+	tmVals := make([]*Validator, len(vals))
+	for i, v := range vals {
+		pub, err := PB2TM.PubKey(v.PubKey)
+		if err != nil {
+			return nil, err
+		}
+		tmVals[i] = &Validator{
+			Address:     v.Address,
+			PubKey:      pub,
+			VotingPower: v.Power,
+		}
+	}
+	return tmVals, nil
+}
diff --git a/version/version.go b/version/version.go
index 1296657d..2c9c88c0 100644
--- a/version/version.go
+++ b/version/version.go
@@ -3,14 +3,14 @@ package version
 // Version components
 const (
 	Maj = "0"
-	Min = "19"
-	Fix = "10"
+	Min = "20"
+	Fix = "0"
 )
 
 var (
 	// Version is the current version of Tendermint
 	// Must be a string because scripts like dist.sh read this file.
-	Version = "0.19.10-dev"
+	Version = "0.20.0-dev"
 
 	// GitCommit is the current HEAD set using ldflags.
 	GitCommit string