diff --git a/go.mod b/go.mod
index cedf6e4..471deb4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/multiformats/go-multiaddr
 
-go 1.13
+go 1.15
 
 require (
 	github.com/ipfs/go-cid v0.0.7
diff --git a/multiaddr_test.go b/multiaddr_test.go
index 3e595a6..e20a474 100644
--- a/multiaddr_test.go
+++ b/multiaddr_test.go
@@ -346,12 +346,12 @@ func TestProtocols(t *testing.T) {
 func TestProtocolsWithString(t *testing.T) {
 	pwn := ProtocolWithName
 	good := map[string][]Protocol{
-		"/ip4":                    []Protocol{pwn("ip4")},
-		"/ip4/tcp":                []Protocol{pwn("ip4"), pwn("tcp")},
-		"ip4/tcp/udp/ip6":         []Protocol{pwn("ip4"), pwn("tcp"), pwn("udp"), pwn("ip6")},
-		"////////ip4/tcp":         []Protocol{pwn("ip4"), pwn("tcp")},
-		"ip4/udp/////////":        []Protocol{pwn("ip4"), pwn("udp")},
-		"////////ip4/tcp////////": []Protocol{pwn("ip4"), pwn("tcp")},
+		"/ip4":                    {pwn("ip4")},
+		"/ip4/tcp":                {pwn("ip4"), pwn("tcp")},
+		"ip4/tcp/udp/ip6":         {pwn("ip4"), pwn("tcp"), pwn("udp"), pwn("ip6")},
+		"////////ip4/tcp":         {pwn("ip4"), pwn("tcp")},
+		"ip4/udp/////////":        {pwn("ip4"), pwn("udp")},
+		"////////ip4/tcp////////": {pwn("ip4"), pwn("tcp")},
 	}
 
 	for s, ps1 := range good {
diff --git a/util_test.go b/util_test.go
index 3793a31..4976d7d 100644
--- a/util_test.go
+++ b/util_test.go
@@ -12,10 +12,10 @@ func TestSplitFirstLast(t *testing.T) {
 	ipfsStr := "/ipfs/QmPSQnBKM9g7BaUcZCvswUJVscQ1ipjmwxN5PXCjkp9EQ7"
 
 	for _, x := range [][]string{
-		[]string{ipStr, tcpStr, quicStr, ipfsStr},
-		[]string{ipStr, tcpStr, ipfsStr},
-		[]string{ipStr, tcpStr},
-		[]string{ipStr},
+		{ipStr, tcpStr, quicStr, ipfsStr},
+		{ipStr, tcpStr, ipfsStr},
+		{ipStr, tcpStr},
+		{ipStr},
 	} {
 		addr := StringCast(strings.Join(x, ""))
 		head, tail := SplitFirst(addr)
@@ -110,10 +110,10 @@ func TestSplitFunc(t *testing.T) {
 	ipfsStr := "/ipfs/QmPSQnBKM9g7BaUcZCvswUJVscQ1ipjmwxN5PXCjkp9EQ7"
 
 	for _, x := range [][]string{
-		[]string{ipStr, tcpStr, quicStr, ipfsStr},
-		[]string{ipStr, tcpStr, ipfsStr},
-		[]string{ipStr, tcpStr},
-		[]string{ipStr},
+		{ipStr, tcpStr, quicStr, ipfsStr},
+		{ipStr, tcpStr, ipfsStr},
+		{ipStr, tcpStr},
+		{ipStr},
 	} {
 		addr := StringCast(strings.Join(x, ""))
 		for i, cs := range x {