diff --git a/blockchain/fullblocktests/params.go b/blockchain/fullblocktests/params.go
index 967ac04b..4889d9d0 100644
--- a/blockchain/fullblocktests/params.go
+++ b/blockchain/fullblocktests/params.go
@@ -1,4 +1,4 @@
-// Copyright (c) 2016-2017 The Decred developers
+// Copyright (c) 2016-2019 The Decred developers
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
@@ -227,6 +227,34 @@ var regNetParams = &chaincfg.Params{
 			StartTime:  0,             // Always available for vote
 			ExpireTime: math.MaxInt64, // Never expires
 		}},
+		7: {{
+			Vote: chaincfg.Vote{
+				Id:          chaincfg.VoteIDFixLNSeqLocks,
+				Description: "Modify sequence lock handling as defined in DCP0004",
+				Mask:        0x0006, // Bits 1 and 2
+				Choices: []chaincfg.Choice{{
+					Id:          "abstain",
+					Description: "abstain voting for change",
+					Bits:        0x0000,
+					IsAbstain:   true,
+					IsNo:        false,
+				}, {
+					Id:          "no",
+					Description: "keep the existing consensus rules",
+					Bits:        0x0002, // Bit 1
+					IsAbstain:   false,
+					IsNo:        true,
+				}, {
+					Id:          "yes",
+					Description: "change to the new consensus rules",
+					Bits:        0x0004, // Bit 2
+					IsAbstain:   false,
+					IsNo:        false,
+				}},
+			},
+			StartTime:  0,             // Always available for vote
+			ExpireTime: math.MaxInt64, // Never expires
+		}},
 	},
 
 	// Enforce current block version once majority of the network has
diff --git a/chaincfg/mainnetparams.go b/chaincfg/mainnetparams.go
index cb2bb385..76e2d250 100644
--- a/chaincfg/mainnetparams.go
+++ b/chaincfg/mainnetparams.go
@@ -1,5 +1,5 @@
 // Copyright (c) 2014-2016 The btcsuite developers
-// Copyright (c) 2015-2017 The Decred developers
+// Copyright (c) 2015-2019 The Decred developers
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
@@ -161,6 +161,34 @@ var MainNetParams = Params{
 			StartTime:  1505260800, // Sep 13th, 2017
 			ExpireTime: 1536796800, // Sep 13th, 2018
 		}},
+		6: {{
+			Vote: Vote{
+				Id:          VoteIDFixLNSeqLocks,
+				Description: "Modify sequence lock handling as defined in DCP0004",
+				Mask:        0x0006, // Bits 1 and 2
+				Choices: []Choice{{
+					Id:          "abstain",
+					Description: "abstain voting for change",
+					Bits:        0x0000,
+					IsAbstain:   true,
+					IsNo:        false,
+				}, {
+					Id:          "no",
+					Description: "keep the existing consensus rules",
+					Bits:        0x0002, // Bit 1
+					IsAbstain:   false,
+					IsNo:        true,
+				}, {
+					Id:          "yes",
+					Description: "change to the new consensus rules",
+					Bits:        0x0004, // Bit 2
+					IsAbstain:   false,
+					IsNo:        false,
+				}},
+			},
+			StartTime:  1548633600, // Jan 28th, 2019
+			ExpireTime: 1580169600, // Jan 28th, 2020
+		}},
 	},
 
 	// Enforce current block version once majority of the network has
diff --git a/chaincfg/params.go b/chaincfg/params.go
index b4688a71..9ba57dc1 100644
--- a/chaincfg/params.go
+++ b/chaincfg/params.go
@@ -1,5 +1,5 @@
 // Copyright (c) 2014-2016 The btcsuite developers
-// Copyright (c) 2015-2018 The Decred developers
+// Copyright (c) 2015-2019 The Decred developers
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
@@ -173,6 +173,11 @@ const (
 	// features useful for the Lightning Network (among other uses) defined
 	// by DCP0002 and DCP0003.
 	VoteIDLNFeatures = "lnfeatures"
+
+	// VoteIDFixLNSeqLocks is the vote ID for the agenda that corrects the
+	// sequence lock functionality needed for Lightning Network (among other
+	// uses) defined by DCP0004.
+	VoteIDFixLNSeqLocks = "fixlnseqlocks"
 )
 
 // ConsensusDeployment defines details related to a specific consensus rule
diff --git a/chaincfg/regnetparams.go b/chaincfg/regnetparams.go
index 72ec8afe..426ef141 100644
--- a/chaincfg/regnetparams.go
+++ b/chaincfg/regnetparams.go
@@ -1,4 +1,4 @@
-// Copyright (c) 2018 The Decred developers
+// Copyright (c) 2018-2019 The Decred developers
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
@@ -149,6 +149,34 @@ var RegNetParams = Params{
 			StartTime:  0,             // Always available for vote
 			ExpireTime: math.MaxInt64, // Never expires
 		}},
+		7: {{
+			Vote: Vote{
+				Id:          VoteIDFixLNSeqLocks,
+				Description: "Modify sequence lock handling as defined in DCP0004",
+				Mask:        0x0006, // Bits 1 and 2
+				Choices: []Choice{{
+					Id:          "abstain",
+					Description: "abstain voting for change",
+					Bits:        0x0000,
+					IsAbstain:   true,
+					IsNo:        false,
+				}, {
+					Id:          "no",
+					Description: "keep the existing consensus rules",
+					Bits:        0x0002, // Bit 1
+					IsAbstain:   false,
+					IsNo:        true,
+				}, {
+					Id:          "yes",
+					Description: "change to the new consensus rules",
+					Bits:        0x0004, // Bit 2
+					IsAbstain:   false,
+					IsNo:        false,
+				}},
+			},
+			StartTime:  0,             // Always available for vote
+			ExpireTime: math.MaxInt64, // Never expires
+		}},
 	},
 
 	// Enforce current block version once majority of the network has
diff --git a/chaincfg/testnetparams.go b/chaincfg/testnetparams.go
index 4459b3f7..596dacd0 100644
--- a/chaincfg/testnetparams.go
+++ b/chaincfg/testnetparams.go
@@ -1,5 +1,5 @@
 // Copyright (c) 2014-2016 The btcsuite developers
-// Copyright (c) 2015-2018 The Decred developers
+// Copyright (c) 2015-2019 The Decred developers
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
@@ -63,6 +63,36 @@ var TestNet3Params = Params{
 	RuleChangeActivationMultiplier: 3,    // 75%
 	RuleChangeActivationDivisor:    4,
 	RuleChangeActivationInterval:   5040, // 1 week
+	Deployments: map[uint32][]ConsensusDeployment{
+		7: {{
+			Vote: Vote{
+				Id:          VoteIDFixLNSeqLocks,
+				Description: "Modify sequence lock handling as defined in DCP0004",
+				Mask:        0x0006, // Bits 1 and 2
+				Choices: []Choice{{
+					Id:          "abstain",
+					Description: "abstain voting for change",
+					Bits:        0x0000,
+					IsAbstain:   true,
+					IsNo:        false,
+				}, {
+					Id:          "no",
+					Description: "keep the existing consensus rules",
+					Bits:        0x0002, // Bit 1
+					IsAbstain:   false,
+					IsNo:        true,
+				}, {
+					Id:          "yes",
+					Description: "change to the new consensus rules",
+					Bits:        0x0004, // Bit 2
+					IsAbstain:   false,
+					IsNo:        false,
+				}},
+			},
+			StartTime:  1548633600, // Jan 28th, 2019
+			ExpireTime: 1580169600, // Jan 28th, 2020
+		}},
+	},
 
 	// Enforce current block version once majority of the network has
 	// upgraded.
diff --git a/go.mod b/go.mod
index 6ba17446..0f3dbb8e 100644
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,7 @@ require (
 	github.com/decred/dcrd/blockchain v1.1.1
 	github.com/decred/dcrd/blockchain/stake v1.1.0
 	github.com/decred/dcrd/certgen v1.0.2
-	github.com/decred/dcrd/chaincfg v1.2.1
+	github.com/decred/dcrd/chaincfg v1.3.0
 	github.com/decred/dcrd/chaincfg/chainhash v1.0.1
 	github.com/decred/dcrd/connmgr v1.0.2
 	github.com/decred/dcrd/database v1.0.3