diff --git a/.changelog/unreleased/dependencies/3728-update-btcec-v2.md b/.changelog/unreleased/dependencies/3728-update-btcec-v2.md
new file mode 100644
index 00000000000..361592b2c9c
--- /dev/null
+++ b/.changelog/unreleased/dependencies/3728-update-btcec-v2.md
@@ -0,0 +1,4 @@
+- `[crypto/secp256k1]` Adjust to breaking interface changes in
+  `btcec/v2` latest release, while avoiding breaking changes to
+  local CometBFT functions
+  ([\#3728](https://github.com/cometbft/cometbft/pull/3728))
diff --git a/crypto/secp256k1/secp256k1.go b/crypto/secp256k1/secp256k1.go
index a0e9bc933fb..dc392e69d06 100644
--- a/crypto/secp256k1/secp256k1.go
+++ b/crypto/secp256k1/secp256k1.go
@@ -118,10 +118,7 @@ func (privKey PrivKey) Sign(msg []byte) ([]byte, error) {
 	priv, _ := secp256k1.PrivKeyFromBytes(privKey)
 
 	sum := sha256.Sum256(msg)
-	sig, err := ecdsa.SignCompact(priv, sum[:], false)
-	if err != nil {
-		return nil, err
-	}
+	sig := ecdsa.SignCompact(priv, sum[:], false)
 
 	// remove the first byte which is compactSigRecoveryCode
 	return sig[1:], nil
diff --git a/go.mod b/go.mod
index 984669197db..accfc285b12 100644
--- a/go.mod
+++ b/go.mod
@@ -37,7 +37,7 @@ require github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7
 
 require (
 	github.com/Masterminds/semver/v3 v3.2.1
-	github.com/btcsuite/btcd/btcec/v2 v2.3.3
+	github.com/btcsuite/btcd/btcec/v2 v2.3.4
 	github.com/btcsuite/btcd/btcutil v1.1.6
 	github.com/cometbft/cometbft-db v0.14.0
 	github.com/cometbft/cometbft-load-test v0.1.0
diff --git a/go.sum b/go.sum
index 9bf2f337fce..324d5aab23f 100644
--- a/go.sum
+++ b/go.sum
@@ -38,8 +38,8 @@ github.com/btcsuite/btcd v0.24.2 h1:aLmxPguqxza+4ag8R1I2nnJjSu2iFn/kqtHTIImswcY=
 github.com/btcsuite/btcd v0.24.2/go.mod h1:5C8ChTkl5ejr3WHj8tkQSCmydiMEPB0ZhQhehpq7Dgg=
 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 v2.3.3 h1:6+iXlDKE8RMtKsvK0gshlXIuPbyWM/h84Ensb7o3sC0=
-github.com/btcsuite/btcd/btcec/v2 v2.3.3/go.mod h1:zYzJ8etWJQIv1Ogk7OzpWjowwOdXY1W/17j2MW85J04=
+github.com/btcsuite/btcd/btcec/v2 v2.3.4 h1:3EJjcN70HCu/mwqlUsGK8GcNVyLVxFDlWurTXGPFfiQ=
+github.com/btcsuite/btcd/btcec/v2 v2.3.4/go.mod h1:zYzJ8etWJQIv1Ogk7OzpWjowwOdXY1W/17j2MW85J04=
 github.com/btcsuite/btcd/btcutil v1.0.0/go.mod h1:Uoxwv0pqYWhD//tfTiipkxNfdhG9UrLwaeswfjfdF0A=
 github.com/btcsuite/btcd/btcutil v1.1.0/go.mod h1:5OapHB7A2hBBWLm48mmw4MOHNJCcUBTwmWH/0Jn8VHE=
 github.com/btcsuite/btcd/btcutil v1.1.5/go.mod h1:PSZZ4UitpLBWzxGd5VGOrLnmOjtPP/a6HaFo12zMs00=