diff --git a/cmd/wasm/functions.go b/cmd/wasm/functions.go
index 81cf9de..594084b 100644
--- a/cmd/wasm/functions.go
+++ b/cmd/wasm/functions.go
@@ -5,13 +5,14 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"reflect"
+	"syscall/js"
+
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath"
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/config"
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/token"
 	"github.com/speakeasy-api/jsonpath/pkg/overlay"
-	"gopkg.in/yaml.v3"
-	"reflect"
-	"syscall/js"
+	"go.yaml.in/yaml/v4"
 )
 
 func CalculateOverlay(originalYAML, targetYAML, existingOverlay string) (string, error) {
diff --git a/go.mod b/go.mod
index 8ffd79e..7d79d0f 100644
--- a/go.mod
+++ b/go.mod
@@ -5,11 +5,12 @@ go 1.22
 require (
 	github.com/pmezard/go-difflib v1.0.0
 	github.com/stretchr/testify v1.9.0
-	gopkg.in/yaml.v3 v3.0.1
+	go.yaml.in/yaml/v4 v4.0.0-rc.1
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index d85da3a..d98546a 100644
--- a/go.sum
+++ b/go.sum
@@ -9,6 +9,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+go.yaml.in/yaml/v4 v4.0.0-rc.1 h1:4J1+yLKUIPGexM/Si+9d3pij4hdc7aGO04NhrElqXbY=
+go.yaml.in/yaml/v4 v4.0.0-rc.1/go.mod h1:CBdeces52/nUXndfQ5OY8GEQuNR9uEEOJPZj/Xq5IzU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/integration_test.go b/integration_test.go
index 79db502..d43ebc8 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -2,14 +2,15 @@ package jsonpath_test
 
 import (
 	"encoding/json"
-	"github.com/pmezard/go-difflib/difflib"
-	"github.com/speakeasy-api/jsonpath/pkg/jsonpath"
-	"github.com/stretchr/testify/require"
-	"gopkg.in/yaml.v3"
 	"os"
 	"slices"
 	"strings"
 	"testing"
+
+	"github.com/pmezard/go-difflib/difflib"
+	"github.com/speakeasy-api/jsonpath/pkg/jsonpath"
+	"github.com/stretchr/testify/require"
+	"go.yaml.in/yaml/v4"
 )
 
 type FullTestSuite struct {
@@ -93,7 +94,7 @@ func TestJSONPathComplianceTestSuite(t *testing.T) {
 
 				// Test case with multiple possible results
 				var found bool
-				for i, _ := range test.Results {
+				for i := range test.Results {
 					if match, msg := compareResults(result, expectedResults[i]); match {
 						found = true
 						break
diff --git a/pkg/jsonpath/filter.go b/pkg/jsonpath/filter.go
index 0f5b77f..f7f6ae0 100644
--- a/pkg/jsonpath/filter.go
+++ b/pkg/jsonpath/filter.go
@@ -1,9 +1,10 @@
 package jsonpath
 
 import (
-	"gopkg.in/yaml.v3"
 	"strconv"
 	"strings"
+
+	"go.yaml.in/yaml/v4"
 )
 
 // filter-selector     = "?" S logical-expr
diff --git a/pkg/jsonpath/jsonpath.go b/pkg/jsonpath/jsonpath.go
index d5c8a5b..62a1d06 100644
--- a/pkg/jsonpath/jsonpath.go
+++ b/pkg/jsonpath/jsonpath.go
@@ -2,9 +2,10 @@ package jsonpath
 
 import (
 	"fmt"
+
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/config"
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/token"
-	"gopkg.in/yaml.v3"
+	"go.yaml.in/yaml/v4"
 )
 
 func NewPath(input string, opts ...config.Option) (*JSONPath, error) {
diff --git a/pkg/jsonpath/segment.go b/pkg/jsonpath/segment.go
index cb6233f..d911a15 100644
--- a/pkg/jsonpath/segment.go
+++ b/pkg/jsonpath/segment.go
@@ -1,8 +1,9 @@
 package jsonpath
 
 import (
-	"gopkg.in/yaml.v3"
 	"strings"
+
+	"go.yaml.in/yaml/v4"
 )
 
 type segmentKind int
diff --git a/pkg/jsonpath/yaml_eval.go b/pkg/jsonpath/yaml_eval.go
index 7291ea9..2ef9d77 100644
--- a/pkg/jsonpath/yaml_eval.go
+++ b/pkg/jsonpath/yaml_eval.go
@@ -2,11 +2,12 @@ package jsonpath
 
 import (
 	"fmt"
-	"gopkg.in/yaml.v3"
 	"reflect"
 	"regexp"
 	"strconv"
 	"unicode/utf8"
+
+	"go.yaml.in/yaml/v4"
 )
 
 func (l literal) Equals(value literal) bool {
@@ -266,7 +267,6 @@ func (q relQuery) Evaluate(idx index, node *yaml.Node, root *yaml.Node) literal
 		return nodeToLiteral(result[0])
 	}
 	return literal{}
-
 }
 
 func (q absQuery) Evaluate(idx index, node *yaml.Node, root *yaml.Node) literal {
diff --git a/pkg/jsonpath/yaml_eval_test.go b/pkg/jsonpath/yaml_eval_test.go
index a74e97b..8038094 100644
--- a/pkg/jsonpath/yaml_eval_test.go
+++ b/pkg/jsonpath/yaml_eval_test.go
@@ -4,7 +4,7 @@ import (
 	"reflect"
 	"testing"
 
-	"gopkg.in/yaml.v3"
+	"go.yaml.in/yaml/v4"
 )
 
 func TestLiteralEquals(t *testing.T) {
diff --git a/pkg/jsonpath/yaml_query.go b/pkg/jsonpath/yaml_query.go
index 44b55a3..9a01e26 100644
--- a/pkg/jsonpath/yaml_query.go
+++ b/pkg/jsonpath/yaml_query.go
@@ -1,7 +1,7 @@
 package jsonpath
 
 import (
-	"gopkg.in/yaml.v3"
+	"go.yaml.in/yaml/v4"
 )
 
 type Evaluator interface {
@@ -60,7 +60,7 @@ func (s segment) Query(idx index, value *yaml.Node, root *yaml.Node) []*yaml.Nod
 		return s.child.Query(idx, value, root)
 	case segmentKindDescendant:
 		// run the inner segment against this node
-		var result = []*yaml.Node{}
+		result := []*yaml.Node{}
 		children := descend(value, root)
 		for _, child := range children {
 			result = append(result, s.descendant.Query(idx, child, root)...)
@@ -142,7 +142,6 @@ func (s innerSegment) Query(idx index, value *yaml.Node, root *yaml.Node) []*yam
 	}
 
 	return result
-
 }
 
 func (s selector) Query(idx index, value *yaml.Node, root *yaml.Node) []*yaml.Node {
diff --git a/pkg/jsonpath/yaml_query_test.go b/pkg/jsonpath/yaml_query_test.go
index 1927f58..f2fd9aa 100644
--- a/pkg/jsonpath/yaml_query_test.go
+++ b/pkg/jsonpath/yaml_query_test.go
@@ -1,12 +1,13 @@
 package jsonpath
 
 import (
-	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/config"
-	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/token"
-	"gopkg.in/yaml.v3"
 	"reflect"
 	"strings"
 	"testing"
+
+	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/config"
+	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/token"
+	"go.yaml.in/yaml/v4"
 )
 
 func TestQuery(t *testing.T) {
diff --git a/pkg/overlay/apply.go b/pkg/overlay/apply.go
index 005ee95..c0bcb41 100644
--- a/pkg/overlay/apply.go
+++ b/pkg/overlay/apply.go
@@ -3,7 +3,7 @@ package overlay
 import (
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath"
 	"github.com/speakeasy-api/jsonpath/pkg/jsonpath/config"
-	"gopkg.in/yaml.v3"
+	"go.yaml.in/yaml/v4"
 )
 
 // ApplyTo will take an overlay and apply its changes to the given YAML
diff --git a/pkg/overlay/apply_test.go b/pkg/overlay/apply_test.go
index 7f6fcf8..0b84ef6 100644
--- a/pkg/overlay/apply_test.go
+++ b/pkg/overlay/apply_test.go
@@ -2,11 +2,12 @@ package overlay_test
 
 import (
 	"bytes"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"gopkg.in/yaml.v3"
 	"os"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.yaml.in/yaml/v4"
 )
 
 // NodeMatchesFile is a test that marshals the YAML file from the given node,
@@ -29,10 +30,10 @@ func NodeMatchesFile(
 	require.NoError(t, err, variadoc("failed to read expected file: ")...)
 
 	// lazy redo snapshot
-	//os.WriteFile(expectedFile, actualBuf.Bytes(), 0644)
+	// os.WriteFile(expectedFile, actualBuf.Bytes(), 0644)
 
-	//t.Log("### EXPECT START ###\n" + string(expectedBytes) + "\n### EXPECT END ###\n")
-	//t.Log("### ACTUAL START ###\n" + actualBuf.string() + "\n### ACTUAL END ###\n")
+	// t.Log("### EXPECT START ###\n" + string(expectedBytes) + "\n### EXPECT END ###\n")
+	// t.Log("### ACTUAL START ###\n" + actualBuf.string() + "\n### ACTUAL END ###\n")
 
 	assert.Equal(t, string(expectedBytes), actualBuf.String(), variadoc("node does not match expected file: ")...)
 }
diff --git a/pkg/overlay/compare.go b/pkg/overlay/compare.go
index 1aa8d2f..fb567f5 100644
--- a/pkg/overlay/compare.go
+++ b/pkg/overlay/compare.go
@@ -6,7 +6,7 @@ import (
 	"log"
 	"strings"
 
-	"gopkg.in/yaml.v3"
+	"go.yaml.in/yaml/v4"
 )
 
 // Compare compares input specifications from two files and returns an overlay
diff --git a/pkg/overlay/compare_test.go b/pkg/overlay/compare_test.go
index fbf6a39..957386c 100644
--- a/pkg/overlay/compare_test.go
+++ b/pkg/overlay/compare_test.go
@@ -2,12 +2,13 @@ package overlay_test
 
 import (
 	"fmt"
+	"os"
+	"testing"
+
 	"github.com/speakeasy-api/jsonpath/pkg/overlay"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"gopkg.in/yaml.v3"
-	"os"
-	"testing"
+	"go.yaml.in/yaml/v4"
 )
 
 func LoadSpecification(path string) (*yaml.Node, error) {
@@ -54,12 +55,11 @@ func TestCompare(t *testing.T) {
 	assert.NoError(t, err)
 
 	// Uncomment this if we've improved the output
-	//os.WriteFile("testdata/overlay-generated.yaml", []byte(o2s), 0644)
+	// os.WriteFile("testdata/overlay-generated.yaml", []byte(o2s), 0644)
 	assert.Equal(t, o1s, o2s)
 
 	// round trip it
 	err = o.ApplyTo(node)
 	assert.NoError(t, err)
 	NodeMatchesFile(t, node, "testdata/openapi-overlayed.yaml")
-
 }
diff --git a/pkg/overlay/parents.go b/pkg/overlay/parents.go
index a2b4942..5954689 100644
--- a/pkg/overlay/parents.go
+++ b/pkg/overlay/parents.go
@@ -1,6 +1,6 @@
 package overlay
 
-import "gopkg.in/yaml.v3"
+import "go.yaml.in/yaml/v4"
 
 type parentIndex map[*yaml.Node]*yaml.Node
 
diff --git a/pkg/overlay/parse.go b/pkg/overlay/parse.go
index 0708846..320ea6e 100644
--- a/pkg/overlay/parse.go
+++ b/pkg/overlay/parse.go
@@ -2,10 +2,11 @@ package overlay
 
 import (
 	"fmt"
-	"gopkg.in/yaml.v3"
 	"io"
 	"os"
 	"path/filepath"
+
+	"go.yaml.in/yaml/v4"
 )
 
 // Parse will parse the given reader as an overlay file.
@@ -47,7 +48,7 @@ func Format(path string) error {
 		return err
 	}
 
-	return os.WriteFile(filePath, []byte(formatted), 0644)
+	return os.WriteFile(filePath, []byte(formatted), 0o644)
 }
 
 // Format writes the file back out as YAML.
diff --git a/pkg/overlay/schema.go b/pkg/overlay/schema.go
index ae1ea3e..1d7a785 100644
--- a/pkg/overlay/schema.go
+++ b/pkg/overlay/schema.go
@@ -2,7 +2,8 @@ package overlay
 
 import (
 	"bytes"
-	"gopkg.in/yaml.v3"
+
+	"go.yaml.in/yaml/v4"
 )
 
 // Extensible provides a place for extensions to be added to components of the