diff --git a/src/go.mod b/src/go.mod
index ad1fc2c42..4638955a7 100644
--- a/src/go.mod
+++ b/src/go.mod
@@ -1,6 +1,6 @@
 module boringssl.googlesource.com/boringssl
 
-go 1.19
+go 1.21
 
 require (
 	golang.org/x/crypto v0.17.0
diff --git a/src/ssl/test/runner/common.go b/src/ssl/test/runner/common.go
index 64f774189..666b4b65b 100644
--- a/src/ssl/test/runner/common.go
+++ b/src/ssl/test/runner/common.go
@@ -2339,15 +2339,6 @@ func unexpectedMessageError(wanted, got any) error {
 	return fmt.Errorf("tls: received unexpected handshake message of type %T when waiting for %T", got, wanted)
 }
 
-func isSupportedSignatureAlgorithm(sigAlg signatureAlgorithm, sigAlgs []signatureAlgorithm) bool {
-	for _, s := range sigAlgs {
-		if s == sigAlg {
-			return true
-		}
-	}
-	return false
-}
-
 var (
 	// See RFC 8446, section 4.1.3.
 	downgradeTLS13 = []byte{0x44, 0x4f, 0x57, 0x4e, 0x47, 0x52, 0x44, 0x01}
diff --git a/src/ssl/test/runner/sign.go b/src/ssl/test/runner/sign.go
index 70541a1ec..e0c6a92b1 100644
--- a/src/ssl/test/runner/sign.go
+++ b/src/ssl/test/runner/sign.go
@@ -18,6 +18,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"slices"
 )
 
 type signer interface {
@@ -35,7 +36,7 @@ func selectSignatureAlgorithm(version uint16, key crypto.PrivateKey, config *Con
 	}
 
 	for _, sigAlg := range config.signSignatureAlgorithms() {
-		if !isSupportedSignatureAlgorithm(sigAlg, peerSigAlgs) {
+		if !slices.Contains(peerSigAlgs, sigAlg) {
 			continue
 		}
 
@@ -68,7 +69,7 @@ func signMessage(version uint16, key crypto.PrivateKey, config *Config, sigAlg s
 }
 
 func verifyMessage(version uint16, key crypto.PublicKey, config *Config, sigAlg signatureAlgorithm, msg, sig []byte) error {
-	if version >= VersionTLS12 && !isSupportedSignatureAlgorithm(sigAlg, config.verifySignatureAlgorithms()) {
+	if version >= VersionTLS12 && !slices.Contains(config.verifySignatureAlgorithms(), sigAlg) {
 		return errors.New("tls: unsupported signature algorithm")
 	}