diff --git a/go.mod b/go.mod
index a8005025..d9d4da45 100644
--- a/go.mod
+++ b/go.mod
@@ -4,15 +4,11 @@ go 1.18
 
 require (
 	github.com/agext/levenshtein v1.2.1
-	github.com/apparentlymart/go-dump v0.0.0-20180507223929-23540a00eaa3
 	github.com/apparentlymart/go-textseg/v15 v15.0.0
 	github.com/davecgh/go-spew v1.1.1
 	github.com/go-test/deep v1.0.3
-	github.com/google/go-cmp v0.3.1
-	github.com/kr/pretty v0.1.0
-	github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348
+	github.com/google/go-cmp v0.6.0
 	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7
-	github.com/sergi/go-diff v1.0.0
 	github.com/spf13/pflag v1.0.2
 	github.com/zclconf/go-cty v1.13.0
 	github.com/zclconf/go-cty-debug v0.0.0-20191215020915-b22d67c1ba0b
@@ -22,9 +18,6 @@ require (
 
 require (
 	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
-	github.com/kr/text v0.1.0 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.2.2 // indirect
 	golang.org/x/mod v0.8.0 // indirect
 	golang.org/x/sys v0.5.0 // indirect
 	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 // indirect
diff --git a/go.sum b/go.sum
index 62014eb6..08ed23ed 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,5 @@
 github.com/agext/levenshtein v1.2.1 h1:QmvMAjj2aEICytGiWzmxoE0x2KZvE0fvmqMOfy2tjT8=
 github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
-github.com/apparentlymart/go-dump v0.0.0-20180507223929-23540a00eaa3 h1:ZSTrOEhiM5J5RFxEaFvMZVEAM1KvT1YzbEOwB2EAGjA=
-github.com/apparentlymart/go-dump v0.0.0-20180507223929-23540a00eaa3/go.mod h1:oL81AME2rN47vu18xqj1S1jPIPuN7afo62yKTNn3XMM=
 github.com/apparentlymart/go-textseg v1.0.0/go.mod h1:z96Txxhf3xSFMPmb5X/1W05FF/Nj9VFpLOpjS5yuumk=
 github.com/apparentlymart/go-textseg/v13 v13.0.0 h1:Y+KvPE1NYz0xl601PVImeQfFyEy6iT90AvPUL1NNfNw=
 github.com/apparentlymart/go-textseg/v13 v13.0.0/go.mod h1:ZK2fH7c4NqDTLtiYLvIkEghdlcqw7yxLeM89kiTRPUo=
@@ -12,25 +10,17 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/go-test/deep v1.0.3 h1:ZrJSEWsXzPOxaZnFteGEfooLba+ju3FYIbOrS+rQd68=
 github.com/go-test/deep v1.0.3/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
 github.com/golang/protobuf v1.1.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 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/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348 h1:MtvEpTB6LX3vkb4ax0b5D2DHbNAUsen0Gx5wZoq3lV4=
 github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348/go.mod h1:B69LEHPfb2qLo0BaaOLcbitczOKLWTsrBG9LczfCD4k=
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzCv8LZP15IdmG+YdwD2luVPHITV96TkirNBM=
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
-github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/spf13/pflag v1.0.2 h1:Fy0orTDgHdbnzHcsOgfCN4LtHf0ec3wwtiwJqwvf3Gc=
 github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
-github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/vmihailenco/msgpack v3.3.3+incompatible/go.mod h1:fy3FlTQTDXWkZ7Bh6AcGMlsjHatGryHQYUTf1ShIgkk=
 github.com/zclconf/go-cty v1.2.0/go.mod h1:hOPWgoHbaTUnI5k4D2ld+GRpFJSCe6bCM7m1q/N4PQ8=
 github.com/zclconf/go-cty v1.13.0 h1:It5dfKTTZHe9aeppbNOda3mN7Ag7sg6QkBNm6TkyFa0=
diff --git a/hcldec/spec_test.go b/hcldec/spec_test.go
index 1b0594d1..a88066b5 100644
--- a/hcldec/spec_test.go
+++ b/hcldec/spec_test.go
@@ -8,7 +8,6 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/apparentlymart/go-dump/dump"
 	"github.com/google/go-cmp/cmp"
 	"github.com/zclconf/go-cty-debug/ctydebug"
 	"github.com/zclconf/go-cty/cty"
@@ -98,7 +97,16 @@ bar = barval
 			},
 		}
 		if !reflect.DeepEqual(gotVars, wantVars) {
-			t.Errorf("wrong Variables result\ngot: %s\nwant: %s", dump.Value(gotVars), dump.Value(wantVars))
+			t.Errorf(
+				"wrong Variables result\n%s",
+				cmp.Diff(
+					wantVars, gotVars,
+					cmp.AllowUnexported(
+						hcl.TraverseRoot{},
+					),
+					ctydebug.CmpOptions,
+				),
+			)
 		}
 
 		ctx := &hcl.EvalContext{
diff --git a/hclsyntax/parser_test.go b/hclsyntax/parser_test.go
index 90a75832..10825f15 100644
--- a/hclsyntax/parser_test.go
+++ b/hclsyntax/parser_test.go
@@ -5,19 +5,16 @@ package hclsyntax
 
 import (
 	"fmt"
+	"sync"
 	"testing"
 
-	"github.com/go-test/deep"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/hashicorp/hcl/v2"
+	"github.com/zclconf/go-cty-debug/ctydebug"
 	"github.com/zclconf/go-cty/cty"
 )
 
-func init() {
-	deep.MaxDepth = 999
-}
-
 func TestParseConfig(t *testing.T) {
 	tests := []struct {
 		input     string
@@ -2197,6 +2194,7 @@ block "valid" {}
 					"a": {
 						Name: "a",
 						Expr: &LiteralValueExpr{
+							Val: cty.DynamicVal,
 							SrcRange: hcl.Range{
 								Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
 								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
@@ -2235,6 +2233,7 @@ block "valid" {}
 					"a": {
 						Name: "a",
 						Expr: &LiteralValueExpr{
+							Val: cty.DynamicVal,
 							SrcRange: hcl.Range{
 								Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
 								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
@@ -2687,11 +2686,23 @@ block "valid" {}
 			}
 
 			got := file.Body
-
-			if diff := deep.Equal(got, test.want); diff != nil {
-				for _, problem := range diff {
-					t.Errorf(problem)
-				}
+			diff := cmp.Diff(
+				test.want, got,
+				cmp.AllowUnexported(
+					Body{},
+					AnonSymbolExpr{},
+					hcl.TraverseRoot{},
+					hcl.TraverseAttr{},
+					hcl.TraverseIndex{},
+				),
+				cmpopts.IgnoreUnexported(
+					sync.Mutex{},
+					sync.RWMutex{},
+				),
+				ctydebug.CmpOptions,
+			)
+			if diff != "" {
+				t.Errorf("wrong result\n%s", diff)
 			}
 		})
 	}
@@ -4006,10 +4017,8 @@ func TestParseConfigDiagnostics(t *testing.T) {
 			t.Logf("\n%s", test.input)
 			_, diags := ParseConfig([]byte(test.input), "test.hcl", hcl.InitialPos)
 
-			if diff := deep.Equal(diags, test.want); diff != nil {
-				for _, problem := range diff {
-					t.Errorf(problem)
-				}
+			if diff := cmp.Diff(test.want, diags); diff != "" {
+				t.Errorf("wrong diagnostics\n%s", diff)
 			}
 		})
 	}
diff --git a/hclsyntax/structure_test.go b/hclsyntax/structure_test.go
index c86dc328..180425bf 100644
--- a/hclsyntax/structure_test.go
+++ b/hclsyntax/structure_test.go
@@ -8,8 +8,10 @@ import (
 	"reflect"
 	"testing"
 
+	"github.com/davecgh/go-spew/spew"
+	"github.com/google/go-cmp/cmp"
 	"github.com/hashicorp/hcl/v2"
-	"github.com/kylelemons/godebug/pretty"
+	"github.com/zclconf/go-cty-debug/ctydebug"
 	"github.com/zclconf/go-cty/cty"
 )
 
@@ -390,12 +392,6 @@ func TestBodyContent(t *testing.T) {
 		},
 	}
 
-	prettyConfig := &pretty.Config{
-		Diffable:          true,
-		IncludeUnexported: true,
-		PrintStringers:    true,
-	}
-
 	for i, test := range tests {
 		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
 			var got *hcl.BodyContent
@@ -416,7 +412,7 @@ func TestBodyContent(t *testing.T) {
 			if !reflect.DeepEqual(got, test.want) {
 				t.Errorf(
 					"wrong result\ndiff: %s",
-					prettyConfig.Compare(test.want, got),
+					cmp.Diff(test.want, got),
 				)
 			}
 		})
@@ -499,7 +495,7 @@ func TestBodyJustAttributes(t *testing.T) {
 					},
 				},
 				hiddenAttrs: map[string]struct{}{
-					"foo": struct{}{},
+					"foo": {},
 				},
 			},
 			hcl.Attributes{},
@@ -507,12 +503,6 @@ func TestBodyJustAttributes(t *testing.T) {
 		},
 	}
 
-	prettyConfig := &pretty.Config{
-		Diffable:          true,
-		IncludeUnexported: true,
-		PrintStringers:    true,
-	}
-
 	for i, test := range tests {
 		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
 			got, diags := test.body.JustAttributes()
@@ -524,11 +514,15 @@ func TestBodyJustAttributes(t *testing.T) {
 				}
 			}
 
-			if !reflect.DeepEqual(got, test.want) {
+			diff := cmp.Diff(
+				test.want, got,
+				ctydebug.CmpOptions,
+			)
+			if diff != "" {
 				t.Errorf(
 					"wrong result\nbody: %s\ndiff: %s",
-					prettyConfig.Sprint(test.body),
-					prettyConfig.Compare(test.want, got),
+					spew.Sdump(test.body),
+					diff,
 				)
 			}
 		})
diff --git a/hclsyntax/variables_test.go b/hclsyntax/variables_test.go
index c841d94a..9eb3d411 100644
--- a/hclsyntax/variables_test.go
+++ b/hclsyntax/variables_test.go
@@ -8,8 +8,8 @@ import (
 	"reflect"
 	"testing"
 
+	"github.com/davecgh/go-spew/spew"
 	"github.com/hashicorp/hcl/v2"
-	"github.com/kr/pretty"
 	"github.com/zclconf/go-cty/cty"
 )
 
@@ -300,7 +300,10 @@ func TestVariables(t *testing.T) {
 			got := Variables(test.Expr)
 
 			if !reflect.DeepEqual(got, test.Want) {
-				t.Errorf("wrong result\ngot:  %s\nwant: %s", pretty.Sprint(got), pretty.Sprint(test.Want))
+				t.Errorf(
+					"wrong result\ngot:  %s\nwant: %s",
+					spew.Sdump(got), spew.Sdump(test.Want),
+				)
 			}
 		})
 	}
diff --git a/hclwrite/parser_test.go b/hclwrite/parser_test.go
index e557940e..8ccae993 100644
--- a/hclwrite/parser_test.go
+++ b/hclwrite/parser_test.go
@@ -5,15 +5,11 @@ package hclwrite
 
 import (
 	"fmt"
-	"reflect"
 	"testing"
 
 	"github.com/davecgh/go-spew/spew"
-
 	"github.com/google/go-cmp/cmp"
 
-	"github.com/kylelemons/godebug/pretty"
-
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/hclsyntax"
 )
@@ -1360,12 +1356,6 @@ func TestPartitionTokens(t *testing.T) {
 		},
 	}
 
-	prettyConfig := &pretty.Config{
-		Diffable:          true,
-		IncludeUnexported: true,
-		PrintStringers:    true,
-	}
-
 	for i, test := range tests {
 		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
 			gotStart, gotEnd := partitionTokens(test.tokens, test.rng)
@@ -1373,7 +1363,7 @@ func TestPartitionTokens(t *testing.T) {
 			if gotStart != test.wantStart || gotEnd != test.wantEnd {
 				t.Errorf(
 					"wrong result\ntokens: %s\nrange: %#v\ngot:   %d, %d\nwant:  %d, %d",
-					prettyConfig.Sprint(test.tokens), test.rng,
+					spew.Sdump(test.tokens), test.rng,
 					gotStart, test.wantStart,
 					gotEnd, test.wantEnd,
 				)
@@ -1437,12 +1427,6 @@ func TestPartitionLeadCommentTokens(t *testing.T) {
 		},
 	}
 
-	prettyConfig := &pretty.Config{
-		Diffable:          true,
-		IncludeUnexported: true,
-		PrintStringers:    true,
-	}
-
 	for i, test := range tests {
 		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
 			gotStart := partitionLeadCommentTokens(test.tokens)
@@ -1450,7 +1434,7 @@ func TestPartitionLeadCommentTokens(t *testing.T) {
 			if gotStart != test.wantStart {
 				t.Errorf(
 					"wrong result\ntokens: %s\ngot:   %d\nwant:  %d",
-					prettyConfig.Sprint(test.tokens),
+					spew.Sdump(test.tokens),
 					gotStart, test.wantStart,
 				)
 			}
@@ -1589,20 +1573,15 @@ foo "bar" "baz" {
 		},
 	}
 
-	prettyConfig := &pretty.Config{
-		Diffable:          true,
-		IncludeUnexported: true,
-		PrintStringers:    true,
-	}
-
 	for _, test := range tests {
 		t.Run(test.input, func(t *testing.T) {
 			got := lexConfig([]byte(test.input))
 
-			if !reflect.DeepEqual(got, test.want) {
-				diff := prettyConfig.Compare(test.want, got)
+			diff := cmp.Diff(test.want, got)
+			if diff != "" {
 				t.Errorf(
-					"wrong result\ninput: %s\ndiff:  %s", test.input, diff,
+					"wrong result\ninput: %s\ndiff:\n%s",
+					test.input, diff,
 				)
 			}
 		})
diff --git a/hclwrite/round_trip_test.go b/hclwrite/round_trip_test.go
index bf306de5..9dbb1526 100644
--- a/hclwrite/round_trip_test.go
+++ b/hclwrite/round_trip_test.go
@@ -7,7 +7,7 @@ import (
 	"bytes"
 	"testing"
 
-	"github.com/sergi/go-diff/diffmatchpatch"
+	"github.com/google/go-cmp/cmp"
 	"github.com/zclconf/go-cty/cty"
 	"github.com/zclconf/go-cty/cty/function"
 	"github.com/zclconf/go-cty/cty/function/stdlib"
@@ -71,12 +71,8 @@ block {
 			}
 
 			result := wr.Bytes()
-
 			if !bytes.Equal(result, src) {
-				dmp := diffmatchpatch.New()
-				diffs := dmp.DiffMain(string(src), string(result), false)
-				// t.Errorf("wrong result\nresult:\n%s\ninput:\n%s", result, src)
-				t.Errorf("wrong result\ndiff: (red indicates missing lines, and green indicates unexpected lines)\n%s", dmp.DiffPrettyText(diffs))
+				t.Errorf("wrong result\ndiff:\n%s", cmp.Diff(string(src), string(result)))
 			}
 		})
 	}