cmd/tlsc/main.go | 2 +-
 conn.go          | 2 --
 go.mod           | 2 +-

diff --git a/cmd/tlsc/main.go b/cmd/tlsc/main.go
index 0e23cbe91419569e7aadd19c5b4bc94d97f418769e5fd8e3fe5f4362d1b35b14..98bee7e9f76ea8068b91667a4083c0def31b626854626af83fb5d7107b08105d 100644
--- a/cmd/tlsc/main.go
+++ b/cmd/tlsc/main.go
@@ -95,7 +95,7 @@ 		}
 		cfg.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
 			spki := verifiedChains[0][0].RawSubjectPublicKeyInfo
 			hshTheir := sha256.Sum256(spki)
-			if bytes.Compare(hshOur, hshTheir[:]) != 0 {
+			if !bytes.Equal(hshOur, hshTheir[:]) {
 				return errors.New("server certificate's SPKI hash mismatch")
 			}
 			return nil
diff --git a/conn.go b/conn.go
index feac62becf359acd0c22e1a93281e3adef14033a212418bd1e5fcee25fec094d..eb3cd97797377f0e236888796d9e95b7433a536f578b23c24d57125febd34e99 100644
--- a/conn.go
+++ b/conn.go
@@ -24,8 +24,6 @@ 	"os"
 	"time"
 )
 
-var aLongTimeAgo = time.Unix(1, 0)
-
 type Addr struct {
 	ip   string
 	port string
diff --git a/go.mod b/go.mod
index 020ea3f8bad0ef6562d301ba47125b7810ccc7530557fd8dee0330fa27717cc8..dba658700eeb7f5d9eee6635f2c592224b6c0ee250e732556fed18b36a18c157 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module go.cypherpunks.ru/ucspi
 
-go 1.16
+go 1.20