diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..77b7be5
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+- package-ecosystem: gomod
+  directory: /
+  schedule:
+    interval: weekly
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: weekly
diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index db23318..eb21888 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -7,10 +7,10 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2
         with:
-          go-version: 1.13.x
-      - uses: actions/checkout@v2
+          go-version: 1.18.x
+      - uses: actions/checkout@v3
       - name: Build
         run: go build .
       - name: Test
diff --git a/.gitignore b/.gitignore
index 1f0a99f..b2d4781 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 _go*
 _test*
 _obj
+/.idea
diff --git a/formatter.go b/formatter.go
index 5bf7e15..1d2eb7a 100644
--- a/formatter.go
+++ b/formatter.go
@@ -93,6 +93,24 @@ type visit struct {
 	typ reflect.Type
 }
 
+func (p *printer) catchPanic(v reflect.Value, method string) {
+	if r := recover(); r != nil {
+		if v.Kind() == reflect.Ptr && v.IsNil() {
+			writeByte(p, '(')
+			io.WriteString(p, v.Type().String())
+			io.WriteString(p, ")(nil)")
+			return
+		}
+		writeByte(p, '(')
+		io.WriteString(p, v.Type().String())
+		io.WriteString(p, ")(PANIC=calling method ")
+		io.WriteString(p, strconv.Quote(method))
+		io.WriteString(p, ": ")
+		fmt.Fprint(p, r)
+		writeByte(p, ')')
+	}
+}
+
 func (p *printer) printValue(v reflect.Value, showType, quote bool) {
 	if p.depth > 10 {
 		io.WriteString(p, "!%v(DEPTH EXCEEDED)")
@@ -102,6 +120,7 @@ func (p *printer) printValue(v reflect.Value, showType, quote bool) {
 	if v.IsValid() && v.CanInterface() {
 		i := v.Interface()
 		if goStringer, ok := i.(fmt.GoStringer); ok {
+			defer p.catchPanic(v, "GoString")
 			io.WriteString(p, goStringer.GoString())
 			return
 		}
diff --git a/formatter_test.go b/formatter_test.go
index df40e4c..b8c2f58 100644
--- a/formatter_test.go
+++ b/formatter_test.go
@@ -98,7 +98,7 @@ var gosyntax = []test{
 		`[]string{"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"}`,
 	},
 	{F(5), "pretty.F(5)"},
-	{ NewStructWithPrivateFields("foo"), `NewStructWithPrivateFields("foo")`},
+	{NewStructWithPrivateFields("foo"), `NewStructWithPrivateFields("foo")`},
 	{
 		SA{&T{1, 2}, T{3, 4}},
 		`pretty.SA{
@@ -181,6 +181,41 @@ var gosyntax = []test{
 		time.Date(2009, 11, 17, 20, 34, 58, 651387237, time.UTC),
 		"time.Date(2009, time.November, 17, 20, 34, 58, 651387237, time.UTC)",
 	},
+	{(*time.Time)(nil), "(*time.Time)(nil)"},
+	{&ValueGoString{"vgs"}, `VGS vgs`},
+	{(*ValueGoString)(nil), `(*pretty.ValueGoString)(nil)`},
+	{(*VGSWrapper)(nil), `(*pretty.VGSWrapper)(nil)`},
+	{&PointerGoString{"pgs"}, `PGS pgs`},
+	{(*PointerGoString)(nil), "(*pretty.PointerGoString)(nil)"},
+	{&PanicGoString{"oops!"}, `(*pretty.PanicGoString)(PANIC=calling method "GoString": oops!)`},
+}
+
+type ValueGoString struct {
+	s string
+}
+
+func (g ValueGoString) GoString() string {
+	return "VGS " + g.s
+}
+
+type VGSWrapper struct {
+	ValueGoString
+}
+
+type PointerGoString struct {
+	s string
+}
+
+func (g *PointerGoString) GoString() string {
+	return "PGS " + g.s
+}
+
+type PanicGoString struct {
+	s string
+}
+
+func (g *PanicGoString) GoString() string {
+	panic(g.s)
 }
 
 func TestGoSyntax(t *testing.T) {
diff --git a/go.mod b/go.mod
index 94ffbe2..31042e3 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,8 @@
 module github.com/zk-org/pretty
 
-go 1.12
+go 1.18
 
 require (
 	github.com/kr/text v0.2.0
-	github.com/rogpeppe/go-internal v1.6.1
+	github.com/rogpeppe/go-internal v1.9.0
 )
diff --git a/go.sum b/go.sum
index 0d561de..4a97a0e 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,5 @@
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
-github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=