diff --git a/chainreg/chainparams.go b/chainreg/chainparams.go
index 33006d5a2..166a1fec5 100644
--- a/chainreg/chainparams.go
+++ b/chainreg/chainparams.go
@@ -22,6 +22,14 @@ var BitcoinTestNetParams = BitcoinNetParams{
 	CoinType: keychain.CoinTypeTestnet,
 }
 
+// BitcoinTestNet4Params contains parameters specific to the 4th version of the
+// test network.
+var BitcoinTestNet4Params = BitcoinNetParams{
+	Params:   &bitcoinCfg.TestNet4Params,
+	RPCPort:  "48334",
+	CoinType: keychain.CoinTypeTestnet,
+}
+
 // BitcoinMainNetParams contains parameters specific to the current Bitcoin
 // mainnet.
 var BitcoinMainNetParams = BitcoinNetParams{
@@ -53,8 +61,9 @@ var BitcoinRegTestNetParams = BitcoinNetParams{
 	CoinType: keychain.CoinTypeTestnet,
 }
 
-// IsTestnet tests if the givern params correspond to a testnet
-// parameter configuration.
+// IsTestnet tests if the given params correspond to a testnet parameter
+// configuration.
 func IsTestnet(params *BitcoinNetParams) bool {
-	return params.Params.Net == bitcoinWire.TestNet3
+	return params.Params.Net == bitcoinWire.TestNet3 ||
+		params.Params.Net == bitcoinWire.TestNet4
 }
diff --git a/chainreg/chainregistry.go b/chainreg/chainregistry.go
index a9a9ede70..3f9f738b2 100644
--- a/chainreg/chainregistry.go
+++ b/chainreg/chainregistry.go
@@ -838,6 +838,15 @@ var (
 		0x01, 0xea, 0x33, 0x09, 0x00, 0x00, 0x00, 0x00,
 	})
 
+	// BitcoinTestnet4Genesis is the genesis hash of Bitcoin's testnet4
+	// chain.
+	BitcoinTestnet4Genesis = chainhash.Hash([chainhash.HashSize]byte{
+		0x43, 0xf0, 0x8b, 0xda, 0xb0, 0x50, 0xe3, 0x5b,
+		0x56, 0x7c, 0x86, 0x4b, 0x91, 0xf4, 0x7f, 0x50,
+		0xae, 0x72, 0x5a, 0xe2, 0xde, 0x53, 0xbc, 0xfb,
+		0xba, 0xf2, 0x84, 0xda, 0x00, 0x00, 0x00, 0x00,
+	})
+
 	// BitcoinSignetGenesis is the genesis hash of Bitcoin's signet chain.
 	BitcoinSignetGenesis = chainhash.Hash([chainhash.HashSize]byte{
 		0xf6, 0x1e, 0xee, 0x3b, 0x63, 0xa3, 0x80, 0xa4,
diff --git a/cmd/commands/main.go b/cmd/commands/main.go
index 71a8531d9..ec593f1ad 100644
--- a/cmd/commands/main.go
+++ b/cmd/commands/main.go
@@ -286,7 +286,7 @@ func contextWithMetadata(ctx context.Context,
 func extractPathArgs(ctx *cli.Context) (string, string, error) {
 	network := strings.ToLower(ctx.GlobalString("network"))
 	switch network {
-	case "mainnet", "testnet", "regtest", "simnet", "signet":
+	case "mainnet", "testnet", "testnet4", "regtest", "simnet", "signet":
 	default:
 		return "", "", fmt.Errorf("unknown network: %v", network)
 	}
@@ -386,8 +386,9 @@ func Main() {
 		},
 		cli.StringFlag{
 			Name: "network, n",
-			Usage: "The network lnd is running on, e.g. mainnet, " +
-				"testnet, etc.",
+			Usage: "The network lnd is running on; valid values " +
+				"are: mainnet, testnet, testnet4, regtest, " +
+				"signet and simnet.",
 			Value:  "mainnet",
 			EnvVar: envVarNetwork,
 		},
@@ -555,9 +556,12 @@ func networkParams(ctx *cli.Context) (*chaincfg.Params, error) {
 	case "mainnet":
 		return &chaincfg.MainNetParams, nil
 
-	case "testnet":
+	case "testnet", "testnet3":
 		return &chaincfg.TestNet3Params, nil
 
+	case "testnet4":
+		return &chaincfg.TestNet4Params, nil
+
 	case "regtest":
 		return &chaincfg.RegressionNetParams, nil
 
diff --git a/config.go b/config.go
index be0838be2..2390a3ee2 100644
--- a/config.go
+++ b/config.go
@@ -1208,6 +1208,10 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 		numNets++
 		cfg.ActiveNetParams = chainreg.BitcoinTestNetParams
 	}
+	if cfg.Bitcoin.TestNet4 {
+		numNets++
+		cfg.ActiveNetParams = chainreg.BitcoinTestNet4Params
+	}
 	if cfg.Bitcoin.RegTest {
 		numNets++
 		cfg.ActiveNetParams = chainreg.BitcoinRegTestNetParams
@@ -1265,8 +1269,8 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 		cfg.ActiveNetParams.Params = &chainParams
 	}
 	if numNets > 1 {
-		str := "The mainnet, testnet, regtest, simnet and signet " +
-			"params can't be used together -- choose one " +
+		str := "The mainnet, testnet, testnet4, regtest, simnet and " +
+			"signet params can't be used together -- choose one " +
 			"of the five"
 
 		return nil, mkErr(str)
@@ -1275,9 +1279,10 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 	// The target network must be provided, otherwise, we won't
 	// know how to initialize the daemon.
 	if numNets == 0 {
-		str := "either --bitcoin.mainnet, or bitcoin.testnet, " +
-			"bitcoin.simnet, bitcoin.regtest or bitcoin.signet " +
-			"must be specified"
+		str := "either --bitcoin.mainnet, or --bitcoin.testnet, " +
+			"--bitcoin.testnet4, --bitcoin.simnet, " +
+			"--bitcoin.regtest or --bitcoin.signet must be " +
+			"specified"
 
 		return nil, mkErr(str)
 	}
@@ -2202,7 +2207,7 @@ func extractBitcoindRPCParams(networkName, bitcoindDataDir, bitcoindConfigPath,
 	switch networkName {
 	case "mainnet":
 		chainDir = ""
-	case "regtest", "testnet3", "signet":
+	case "regtest", "testnet3", "testnet4", "signet":
 		chainDir = networkName
 	default:
 		return "", "", "", "", fmt.Errorf("unexpected networkname %v", networkName)
diff --git a/docs/release-notes/release-notes-0.19.0.md b/docs/release-notes/release-notes-0.19.0.md
index baaee0705..13efa1831 100644
--- a/docs/release-notes/release-notes-0.19.0.md
+++ b/docs/release-notes/release-notes-0.19.0.md
@@ -234,6 +234,9 @@ close transaction.
 * [The server](https://github.com/lightningnetwork/lnd/pull/9458) now allocates
  restricted slots for certain peers. This is configured by --num-restricted-slots.
 
+* [The bitcoin `testnet4` test network is now also
+  supported](https://github.com/lightningnetwork/lnd/pull/9620).
+
 ## RPC Updates
 
 * Some RPCs that previously just returned an empty response message now at least
diff --git a/go.mod b/go.mod
index 98f35eef2..d1351bca0 100644
--- a/go.mod
+++ b/go.mod
@@ -4,14 +4,14 @@ require (
 	github.com/NebulousLabs/go-upnp v0.0.0-20180202185039-29b680b06c82
 	github.com/Yawning/aez v0.0.0-20211027044916-e49e68abd344
 	github.com/andybalholm/brotli v1.0.4
-	github.com/btcsuite/btcd v0.24.3-0.20241210095828-e646d437e95b
+	github.com/btcsuite/btcd v0.24.3-0.20250318170759-4f4ea81776d6
 	github.com/btcsuite/btcd/btcec/v2 v2.3.4
 	github.com/btcsuite/btcd/btcutil v1.1.5
 	github.com/btcsuite/btcd/btcutil/psbt v1.1.8
 	github.com/btcsuite/btcd/chaincfg/chainhash v1.1.0
 	github.com/btcsuite/btclog v0.0.0-20241003133417-09c4e92e319c
 	github.com/btcsuite/btclog/v2 v2.0.1-0.20250110154127-3ae4bf1cb318
-	github.com/btcsuite/btcwallet v0.16.11
+	github.com/btcsuite/btcwallet v0.16.12
 	github.com/btcsuite/btcwallet/wallet/txauthor v1.3.5
 	github.com/btcsuite/btcwallet/wallet/txrules v1.2.2
 	github.com/btcsuite/btcwallet/walletdb v1.4.4
@@ -31,7 +31,7 @@ require (
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/jrick/logrotate v1.1.2
 	github.com/kkdai/bstream v1.0.0
-	github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd
+	github.com/lightninglabs/neutrino v0.16.1
 	github.com/lightninglabs/neutrino/cache v1.1.2
 	github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb
 	github.com/lightningnetwork/lnd/cert v1.2.2
@@ -64,7 +64,7 @@ require (
 	google.golang.org/protobuf v1.33.0
 	gopkg.in/macaroon-bakery.v2 v2.0.1
 	gopkg.in/macaroon.v2 v2.0.0
-	pgregory.net/rapid v1.1.0
+	pgregory.net/rapid v1.2.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index 9c69f3fc6..a79d0f443 100644
--- a/go.sum
+++ b/go.sum
@@ -73,8 +73,8 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
 github.com/btcsuite/btcd v0.22.0-beta.0.20220111032746-97732e52810c/go.mod h1:tjmYdS6MLJ5/s0Fj4DbLgSbDHbEqLJrtnHecBFkdz5M=
 github.com/btcsuite/btcd v0.23.5-0.20231215221805-96c9fd8078fd/go.mod h1:nm3Bko6zh6bWP60UxwoT5LzdGJsQJaPo6HjduXq9p6A=
-github.com/btcsuite/btcd v0.24.3-0.20241210095828-e646d437e95b h1:VQoobSrWdxICuqFU3tKVu/Lzk7BTk9SsCgRr5dUvC70=
-github.com/btcsuite/btcd v0.24.3-0.20241210095828-e646d437e95b/go.mod h1:zHK7t7sw8XbsCkD64WePHE3r3k9/XoGAcf6mXV14c64=
+github.com/btcsuite/btcd v0.24.3-0.20250318170759-4f4ea81776d6 h1:8n9k3I7e8DkpdQ5YAP4j8ly/LSsbe6qX9vmVbrUGvVw=
+github.com/btcsuite/btcd v0.24.3-0.20250318170759-4f4ea81776d6/go.mod h1:OmM4kFtB0klaG/ZqT86rQiyw/1iyXlJgc3UHClPhhbs=
 github.com/btcsuite/btcd/btcec/v2 v2.1.0/go.mod h1:2VzYrv4Gm4apmbVVsSq5bqf1Ec8v56E48Vt0Y/umPgA=
 github.com/btcsuite/btcd/btcec/v2 v2.1.3/go.mod h1:ctjw4H1kknNJmRN4iP1R7bTQ+v3GJkZBd6mui8ZsAZE=
 github.com/btcsuite/btcd/btcec/v2 v2.3.4 h1:3EJjcN70HCu/mwqlUsGK8GcNVyLVxFDlWurTXGPFfiQ=
@@ -95,8 +95,8 @@ github.com/btcsuite/btclog v0.0.0-20241003133417-09c4e92e319c/go.mod h1:w7xnGOhw
 github.com/btcsuite/btclog/v2 v2.0.1-0.20250110154127-3ae4bf1cb318 h1:oCjIcinPt7XQ644MP/22JcjYEC84qRc3bRBH0d7Hhd4=
 github.com/btcsuite/btclog/v2 v2.0.1-0.20250110154127-3ae4bf1cb318/go.mod h1:XItGUfVOxotJL8kkuk2Hj3EVow5KCugXl3wWfQ6K0AE=
 github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
-github.com/btcsuite/btcwallet v0.16.11 h1:c8RgW/HO79if8P+KFQLQE00ITmFnLPKAzIy9FwxE37A=
-github.com/btcsuite/btcwallet v0.16.11/go.mod h1:1HJXYbjJzgumlnxOC2+ViR1U+gnHWoOn7WeK5OfY1eU=
+github.com/btcsuite/btcwallet v0.16.12 h1:9SREKY892i1xTGlGLcu6x7O+WSQFn6+uQrSuskAOqh0=
+github.com/btcsuite/btcwallet v0.16.12/go.mod h1:jBn+ThFrx/QqW0nXiGvXtJytju4aVoW7C0hY4s/+9vo=
 github.com/btcsuite/btcwallet/wallet/txauthor v1.3.5 h1:Rr0njWI3r341nhSPesKQ2JF+ugDSzdPoeckS75SeDZk=
 github.com/btcsuite/btcwallet/wallet/txauthor v1.3.5/go.mod h1:+tXJ3Ym0nlQc/iHSwW1qzjmPs3ev+UVWMbGgfV1OZqU=
 github.com/btcsuite/btcwallet/wallet/txrules v1.2.2 h1:YEO+Lx1ZJJAtdRrjuhXjWrYsmAk26wLTlNzxt2q0lhk=
@@ -444,8 +444,8 @@ github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lightninglabs/gozmq v0.0.0-20191113021534-d20a764486bf h1:HZKvJUHlcXI/f/O0Avg7t8sqkPo78HFzjmeYFl6DPnc=
 github.com/lightninglabs/gozmq v0.0.0-20191113021534-d20a764486bf/go.mod h1:vxmQPeIQxPf6Jf9rM8R+B4rKBqLA2AjttNxkFBL2Plk=
-github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd h1:D8aRocHpoCv43hL8egXEMYyPmyOiefFHZ66338KQB2s=
-github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd/go.mod h1:x3OmY2wsA18+Kc3TSV2QpSUewOCiscw2mKpXgZv2kZk=
+github.com/lightninglabs/neutrino v0.16.1 h1:5Kz4ToxncEVkpKC6fwUjXKtFKJhuxlG3sBB3MdJTJjs=
+github.com/lightninglabs/neutrino v0.16.1/go.mod h1:L+5UAccpUdyM7yDgmQySgixf7xmwBgJtOfs/IP26jCs=
 github.com/lightninglabs/neutrino/cache v1.1.2 h1:C9DY/DAPaPxbFC+xNNEI/z1SJY9GS3shmlu5hIQ798g=
 github.com/lightninglabs/neutrino/cache v1.1.2/go.mod h1:XJNcgdOw1LQnanGjw8Vj44CvguYA25IMKjWFZczwZuo=
 github.com/lightninglabs/protobuf-go-hex-display v1.30.0-hex-display h1:pRdza2wleRN1L2fJXd6ZoQ9ZegVFTAb2bOQfruJPKcY=
@@ -1076,8 +1076,8 @@ modernc.org/strutil v1.2.0 h1:agBi9dp1I+eOnxXeiZawM8F4LawKv4NzGWSaLfyeNZA=
 modernc.org/strutil v1.2.0/go.mod h1:/mdcBmfOibveCTBxUl5B5l6W+TTH1FXPLHZE6bTosX0=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
 modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
-pgregory.net/rapid v1.1.0 h1:CMa0sjHSru3puNx+J0MIAuiiEV4N0qj8/cMWGBBCsjw=
-pgregory.net/rapid v1.1.0/go.mod h1:PY5XlDGj0+V1FCq0o192FdRhpKHGTRIWBgqjDBTrq04=
+pgregory.net/rapid v1.2.0 h1:keKAYRcjm+e1F0oAuU5F5+YPAWcyxNNRK2wud503Gnk=
+pgregory.net/rapid v1.2.0/go.mod h1:PY5XlDGj0+V1FCq0o192FdRhpKHGTRIWBgqjDBTrq04=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/lncfg/chain.go b/lncfg/chain.go
index 36586ff3a..cbcb9d0ee 100644
--- a/lncfg/chain.go
+++ b/lncfg/chain.go
@@ -17,6 +17,7 @@ type Chain struct {
 
 	MainNet         bool     `long:"mainnet" description:"Use the main network"`
 	TestNet3        bool     `long:"testnet" description:"Use the test network"`
+	TestNet4        bool     `long:"testnet4" description:"Use the testnet4 test network"`
 	SimNet          bool     `long:"simnet" description:"Use the simulation test network"`
 	RegTest         bool     `long:"regtest" description:"Use the regression test network"`
 	SigNet          bool     `long:"signet" description:"Use the signet test network"`
diff --git a/lncfg/config.go b/lncfg/config.go
index 94ca02f46..178ef203b 100644
--- a/lncfg/config.go
+++ b/lncfg/config.go
@@ -108,6 +108,14 @@ func CleanAndExpandPath(path string) string {
 // NormalizeNetwork returns the common name of a network type used to create
 // file paths. This allows differently versioned networks to use the same path.
 func NormalizeNetwork(network string) string {
+	// The 4th testnet isn't the "default" yet, so we'll want to explicitly
+	// point that to a "testnet4" directory.
+	if network == "testnet4" {
+		return network
+	}
+
+	// We want to collapse "testnet3" and "testnet" to the same "testnet"
+	// directory.
 	if strings.HasPrefix(network, "testnet") {
 		return "testnet"
 	}
diff --git a/lnd.go b/lnd.go
index 2b46e83c9..e63ddc196 100644
--- a/lnd.go
+++ b/lnd.go
@@ -194,6 +194,9 @@ func Main(cfg *Config, lisCfg ListenerCfg, implCfg *ImplementationCfg,
 	case cfg.Bitcoin.TestNet3:
 		network = "testnet"
 
+	case cfg.Bitcoin.TestNet4:
+		network = "testnet4"
+
 	case cfg.Bitcoin.MainNet:
 		network = "mainnet"
 
diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go
index 42ce54284..c2ff05f3e 100644
--- a/lnrpc/lightning.pb.go
+++ b/lnrpc/lightning.pb.go
@@ -6265,8 +6265,8 @@ type GetInfoResponse struct {
 	SyncedToChain bool `protobuf:"varint,9,opt,name=synced_to_chain,json=syncedToChain,proto3" json:"synced_to_chain,omitempty"`
 	// Whether we consider ourselves synced with the public channel graph.
 	SyncedToGraph bool `protobuf:"varint,18,opt,name=synced_to_graph,json=syncedToGraph,proto3" json:"synced_to_graph,omitempty"`
-	// Whether the current node is connected to testnet. This field is
-	// deprecated and the network field should be used instead
+	// Whether the current node is connected to testnet or testnet4. This field is
+	// deprecated and the network field should be used instead.
 	//
 	// Deprecated: Marked as deprecated in lightning.proto.
 	Testnet bool `protobuf:"varint,10,opt,name=testnet,proto3" json:"testnet,omitempty"`
diff --git a/lnrpc/lightning.proto b/lnrpc/lightning.proto
index 2de09da1f..ca40e4b4c 100644
--- a/lnrpc/lightning.proto
+++ b/lnrpc/lightning.proto
@@ -2008,8 +2008,8 @@ message GetInfoResponse {
     bool synced_to_graph = 18;
 
     /*
-    Whether the current node is connected to testnet. This field is
-    deprecated and the network field should be used instead
+    Whether the current node is connected to testnet or testnet4. This field is
+    deprecated and the network field should be used instead.
     */
     bool testnet = 10 [deprecated = true];
 
diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json
index c1a5ab4b4..69478fc94 100644
--- a/lnrpc/lightning.swagger.json
+++ b/lnrpc/lightning.swagger.json
@@ -5196,7 +5196,7 @@
         },
         "testnet": {
           "type": "boolean",
-          "title": "Whether the current node is connected to testnet. This field is\ndeprecated and the network field should be used instead"
+          "description": "Whether the current node is connected to testnet or testnet4. This field is\ndeprecated and the network field should be used instead."
         },
         "chains": {
           "type": "array",
diff --git a/lntest/node/config.go b/lntest/node/config.go
index 6cba60941..d71723aac 100644
--- a/lntest/node/config.go
+++ b/lntest/node/config.go
@@ -222,6 +222,8 @@ func (cfg *BaseNodeConfig) GenArgs() []string {
 	switch cfg.NetParams {
 	case &chaincfg.TestNet3Params:
 		args = append(args, "--bitcoin.testnet")
+	case &chaincfg.TestNet4Params:
+		args = append(args, "--bitcoin.testnet4")
 	case &chaincfg.SimNetParams:
 		args = append(args, "--bitcoin.simnet")
 	case &chaincfg.RegressionNetParams:
diff --git a/sample-lnd.conf b/sample-lnd.conf
index 4b9c68afa..53be66404 100644
--- a/sample-lnd.conf
+++ b/sample-lnd.conf
@@ -621,6 +621,9 @@
 ; Use Bitcoin's test network.
 ; bitcoin.testnet=false
 ;
+; Use Bitcoin's 4th version test network.
+; bitcoin.testnet4=false
+;
 ; Use Bitcoin's simulation test network
 ; bitcoin.simnet=false
 
diff --git a/server.go b/server.go
index ad521cd67..19d836a4e 100644
--- a/server.go
+++ b/server.go
@@ -2594,6 +2594,12 @@ func (s *server) Start() error {
 				chainreg.BitcoinTestnetGenesis,
 			)
 		}
+		if s.cfg.Bitcoin.TestNet4 {
+			setSeedList(
+				s.cfg.Bitcoin.DNSSeeds,
+				chainreg.BitcoinTestnet4Genesis,
+			)
+		}
 		if s.cfg.Bitcoin.SigNet {
 			setSeedList(
 				s.cfg.Bitcoin.DNSSeeds,