diff --git a/.travis.yml b/.travis.yml
index 015d3641..aaad3690 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,7 +37,7 @@ before_install:
 script:
   - | 
     if [ ${TESTMODE} == "lint" ]; then
-      travis_retry curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.18.0
+      travis_retry curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.23.8
     fi
   - .travis/script.sh
 
diff --git a/integrationtests/self/zero_rtt_test.go b/integrationtests/self/zero_rtt_test.go
index dce94a0c..fa73fe25 100644
--- a/integrationtests/self/zero_rtt_test.go
+++ b/integrationtests/self/zero_rtt_test.go
@@ -363,7 +363,6 @@ var _ = Describe("0-RTT", func() {
 			})
 
 			It("rejects 0-RTT when the ALPN changed", func() {
-				const maxStreams = 42
 				tlsConf := getTLSConfig()
 				ln, err := quic.ListenAddrEarly(
 					"localhost:0",
diff --git a/internal/handshake/crypto_setup_test.go b/internal/handshake/crypto_setup_test.go
index 76249385..d0e8f617 100644
--- a/internal/handshake/crypto_setup_test.go
+++ b/internal/handshake/crypto_setup_test.go
@@ -54,6 +54,8 @@ func (s *stream) Write(b []byte) (int, error) {
 var _ = Describe("Crypto Setup TLS", func() {
 	var clientConf, serverConf *tls.Config
 
+	// unparam incorrectly complains that the first argument is never used.
+	//nolint:unparam
 	initStreams := func() (chan chunk, *stream /* initial */, *stream /* handshake */) {
 		chunkChan := make(chan chunk, 100)
 		initialStream := newStream(chunkChan, protocol.EncryptionInitial)
diff --git a/packet_packer_test.go b/packet_packer_test.go
index 35aa639f..7b08c67e 100644
--- a/packet_packer_test.go
+++ b/packet_packer_test.go
@@ -547,7 +547,7 @@ var _ = Describe("Packet packer", func() {
 				extHdr, err := hdr.ParseExtended(r, packer.version)
 				Expect(err).ToNot(HaveOccurred())
 				Expect(extHdr.PacketNumberLen).To(Equal(protocol.PacketNumberLen1))
-				Expect(r.Len()).To(Equal(4 - 1 /* packet number length */ + int(sealer.Overhead())))
+				Expect(r.Len()).To(Equal(4 - 1 /* packet number length */ + sealer.Overhead()))
 				// the first bytes of the payload should be a 2 PADDING frames...
 				firstPayloadByte, err := r.ReadByte()
 				Expect(err).ToNot(HaveOccurred())
diff --git a/qlog/qlog_suite_test.go b/qlog/qlog_suite_test.go
index f47c5e60..04316e7c 100644
--- a/qlog/qlog_suite_test.go
+++ b/qlog/qlog_suite_test.go
@@ -15,20 +15,20 @@ func TestQlog(t *testing.T) {
 
 func checkEncoding(data []byte, expected map[string](interface{})) {
 	// unmarshal the data
-	m := make(map[string](interface{}))
+	m := make(map[string]interface{})
 	ExpectWithOffset(1, json.Unmarshal(data, &m)).To(Succeed())
 	ExpectWithOffset(1, m).To(HaveLen(len(expected)))
 	for key, value := range expected {
-		switch value.(type) {
+		switch v := value.(type) {
 		case string:
-			ExpectWithOffset(1, m).To(HaveKeyWithValue(key, value))
+			ExpectWithOffset(1, m).To(HaveKeyWithValue(key, v))
 		case int:
-			ExpectWithOffset(1, m).To(HaveKeyWithValue(key, float64(value.(int))))
+			ExpectWithOffset(1, m).To(HaveKeyWithValue(key, float64(v)))
 		case bool:
-			ExpectWithOffset(1, m).To(HaveKeyWithValue(key, value.(bool)))
+			ExpectWithOffset(1, m).To(HaveKeyWithValue(key, v))
 		case [][]string: // used in the ACK frame
 			ExpectWithOffset(1, m).To(HaveKey(key))
-			for i, l := range value.([][]string) {
+			for i, l := range v {
 				for j, s := range l {
 					ExpectWithOffset(1, m[key].([]interface{})[i].([]interface{})[j].(string)).To(Equal(s))
 				}