diff --git a/jsoninfo/unmarshal.go b/jsoninfo/unmarshal.go
index eb6e758ac..16886ad83 100644
--- a/jsoninfo/unmarshal.go
+++ b/jsoninfo/unmarshal.go
@@ -25,7 +25,7 @@ type ObjectDecoder struct {
 func NewObjectDecoder(data []byte) (*ObjectDecoder, error) {
 	var remainingFields map[string]json.RawMessage
 	if err := json.Unmarshal(data, &remainingFields); err != nil {
-		return nil, fmt.Errorf("failed to unmarshal extension properties: %v (%s)", err, data)
+		return nil, fmt.Errorf("failed to unmarshal extension properties: %w (%s)", err, data)
 	}
 	return &ObjectDecoder{
 		Data:            data,
@@ -87,7 +87,7 @@ func (decoder *ObjectDecoder) DecodeStructFieldsAndExtensions(value interface{})
 						continue
 					}
 				}
-				return fmt.Errorf("failed to unmarshal property %q (%s): %v",
+				return fmt.Errorf("failed to unmarshal property %q (%s): %w",
 					field.JSONName, fieldValue.Type().String(), err)
 			}
 			if !isPtr {
@@ -109,7 +109,7 @@ func (decoder *ObjectDecoder) DecodeStructFieldsAndExtensions(value interface{})
 						continue
 					}
 				}
-				return fmt.Errorf("failed to unmarshal property %q (%s): %v",
+				return fmt.Errorf("failed to unmarshal property %q (%s): %w",
 					field.JSONName, fieldPtr.Type().String(), err)
 			}
 
diff --git a/openapi3/components.go b/openapi3/components.go
index e9af26911..ce7a86990 100644
--- a/openapi3/components.go
+++ b/openapi3/components.go
@@ -99,7 +99,7 @@ func (components *Components) Validate(ctx context.Context) (err error) {
 			return
 		}
 		if err = v.Validate(ctx); err != nil {
-			return fmt.Errorf("%s: %s", k, err)
+			return fmt.Errorf("%s: %w", k, err)
 		}
 	}
 
diff --git a/openapi3/header.go b/openapi3/header.go
index 75e5dd1e2..c71d3f2a8 100644
--- a/openapi3/header.go
+++ b/openapi3/header.go
@@ -71,22 +71,22 @@ func (header *Header) Validate(ctx context.Context) error {
 		sm.Style == SerializationSimple && !sm.Explode ||
 		sm.Style == SerializationSimple && sm.Explode; !smSupported {
 		e := fmt.Errorf("serialization method with style=%q and explode=%v is not supported by a header parameter", sm.Style, sm.Explode)
-		return fmt.Errorf("header schema is invalid: %v", e)
+		return fmt.Errorf("header schema is invalid: %w", e)
 	}
 
 	if (header.Schema == nil) == (header.Content == nil) {
 		e := fmt.Errorf("parameter must contain exactly one of content and schema: %v", header)
-		return fmt.Errorf("header schema is invalid: %v", e)
+		return fmt.Errorf("header schema is invalid: %w", e)
 	}
 	if schema := header.Schema; schema != nil {
 		if err := schema.Validate(ctx); err != nil {
-			return fmt.Errorf("header schema is invalid: %v", err)
+			return fmt.Errorf("header schema is invalid: %w", err)
 		}
 	}
 
 	if content := header.Content; content != nil {
 		if err := content.Validate(ctx); err != nil {
-			return fmt.Errorf("header content is invalid: %v", err)
+			return fmt.Errorf("header content is invalid: %w", err)
 		}
 	}
 	return nil
diff --git a/openapi3/loader.go b/openapi3/loader.go
index 87c9f8684..e9366dcb5 100644
--- a/openapi3/loader.go
+++ b/openapi3/loader.go
@@ -101,7 +101,7 @@ func (loader *Loader) loadSingleElementFromURI(ref string, rootPath *url.URL, el
 
 	resolvedPath, err := resolvePath(rootPath, parsedURL)
 	if err != nil {
-		return nil, fmt.Errorf("could not resolve path: %v", err)
+		return nil, fmt.Errorf("could not resolve path: %w", err)
 	}
 
 	data, err := loader.readURL(resolvedPath)
@@ -285,7 +285,7 @@ func (loader *Loader) resolveComponent(
 
 			if cursor, err = drillIntoField(cursor, pathPart); err != nil {
 				e := failedToResolveRefFragmentPart(ref, pathPart)
-				return nil, fmt.Errorf("%s: %s", e.Error(), err.Error())
+				return nil, fmt.Errorf("%s: %w", e, err)
 			}
 			if cursor == nil {
 				return nil, failedToResolveRefFragmentPart(ref, pathPart)
@@ -430,11 +430,11 @@ func (loader *Loader) resolveRef(doc *T, ref string, path *url.URL) (*T, string,
 
 	var resolvedPath *url.URL
 	if resolvedPath, err = resolvePath(path, parsedURL); err != nil {
-		return nil, "", nil, fmt.Errorf("error resolving path: %v", err)
+		return nil, "", nil, fmt.Errorf("error resolving path: %w", err)
 	}
 
 	if doc, err = loader.loadFromURIInternal(resolvedPath); err != nil {
-		return nil, "", nil, fmt.Errorf("error resolving reference %q: %v", ref, err)
+		return nil, "", nil, fmt.Errorf("error resolving reference %q: %w", ref, err)
 	}
 
 	return doc, "#" + fragment, resolvedPath, nil
diff --git a/openapi3/loader_test.go b/openapi3/loader_test.go
index e33b75d72..64a923c39 100644
--- a/openapi3/loader_test.go
+++ b/openapi3/loader_test.go
@@ -1,7 +1,6 @@
 package openapi3
 
 import (
-	"errors"
 	"fmt"
 	"net"
 	"net/http"
@@ -524,23 +523,27 @@ paths: {}
 servers:
 - @@@
 `
-	for value, expected := range map[string]error{
-		`{url: /}`:                            nil,
-		`{url: "http://{x}.{y}.example.com"}`: errors.New("invalid servers: server has undeclared variables"),
-		`{url: "http://{x}.y}.example.com"}`:  errors.New("invalid servers: server URL has mismatched { and }"),
-		`{url: "http://{x.example.com"}`:      errors.New("invalid servers: server URL has mismatched { and }"),
-		`{url: "http://{x}.example.com", variables: {x: {default: "www"}}}`:                nil,
-		`{url: "http://{x}.example.com", variables: {x: {default: "www", enum: ["www"]}}}`: nil,
-		`{url: "http://{x}.example.com", variables: {x: {enum: ["www"]}}}`:                 errors.New(`invalid servers: field default is required in {"enum":["www"]}`),
-		`{url: "http://www.example.com", variables: {x: {enum: ["www"]}}}`:                 errors.New("invalid servers: server has undeclared variables"),
-		`{url: "http://{y}.example.com", variables: {x: {enum: ["www"]}}}`:                 errors.New("invalid servers: server has undeclared variables"),
+	for value, expected := range map[string]string{
+		`{url: /}`:                            "",
+		`{url: "http://{x}.{y}.example.com"}`: "invalid servers: server has undeclared variables",
+		`{url: "http://{x}.y}.example.com"}`:  "invalid servers: server URL has mismatched { and }",
+		`{url: "http://{x.example.com"}`:      "invalid servers: server URL has mismatched { and }",
+		`{url: "http://{x}.example.com", variables: {x: {default: "www"}}}`:                "",
+		`{url: "http://{x}.example.com", variables: {x: {default: "www", enum: ["www"]}}}`: "",
+		`{url: "http://{x}.example.com", variables: {x: {enum: ["www"]}}}`:                 `invalid servers: field default is required in {"enum":["www"]}`,
+		`{url: "http://www.example.com", variables: {x: {enum: ["www"]}}}`:                 "invalid servers: server has undeclared variables",
+		`{url: "http://{y}.example.com", variables: {x: {enum: ["www"]}}}`:                 "invalid servers: server has undeclared variables",
 	} {
 		t.Run(value, func(t *testing.T) {
 			loader := NewLoader()
 			doc, err := loader.LoadFromData([]byte(strings.Replace(spec, "@@@", value, 1)))
 			require.NoError(t, err)
 			err = doc.Validate(loader.Context)
-			require.Equal(t, expected, err)
+			if expected == "" {
+				require.NoError(t, err)
+			} else {
+				require.EqualError(t, err, expected)
+			}
 		})
 	}
 }
diff --git a/openapi3/media_type.go b/openapi3/media_type.go
index 01df12ad0..b1a3417eb 100644
--- a/openapi3/media_type.go
+++ b/openapi3/media_type.go
@@ -95,10 +95,10 @@ func (mediaType *MediaType) Validate(ctx context.Context) error {
 		} else if examples := mediaType.Examples; examples != nil {
 			for k, v := range examples {
 				if err := v.Validate(ctx); err != nil {
-					return fmt.Errorf("%s: %s", k, err)
+					return fmt.Errorf("%s: %w", k, err)
 				}
 				if err := validateExampleValue(v.Value.Value, schema.Value); err != nil {
-					return fmt.Errorf("%s: %s", k, err)
+					return fmt.Errorf("%s: %w", k, err)
 				}
 			}
 		}
diff --git a/openapi3/openapi3.go b/openapi3/openapi3.go
index 20549c2b7..09b6c2c64 100644
--- a/openapi3/openapi3.go
+++ b/openapi3/openapi3.go
@@ -69,14 +69,14 @@ func (doc *T) Validate(ctx context.Context, opts ...ValidationOption) error {
 	// NOTE: only mention info/components/paths/... key in this func's errors.
 
 	{
-		wrap := func(e error) error { return fmt.Errorf("invalid components: %v", e) }
+		wrap := func(e error) error { return fmt.Errorf("invalid components: %w", e) }
 		if err := doc.Components.Validate(ctx); err != nil {
 			return wrap(err)
 		}
 	}
 
 	{
-		wrap := func(e error) error { return fmt.Errorf("invalid info: %v", e) }
+		wrap := func(e error) error { return fmt.Errorf("invalid info: %w", e) }
 		if v := doc.Info; v != nil {
 			if err := v.Validate(ctx); err != nil {
 				return wrap(err)
@@ -87,7 +87,7 @@ func (doc *T) Validate(ctx context.Context, opts ...ValidationOption) error {
 	}
 
 	{
-		wrap := func(e error) error { return fmt.Errorf("invalid paths: %v", e) }
+		wrap := func(e error) error { return fmt.Errorf("invalid paths: %w", e) }
 		if v := doc.Paths; v != nil {
 			if err := v.Validate(ctx); err != nil {
 				return wrap(err)
@@ -98,7 +98,7 @@ func (doc *T) Validate(ctx context.Context, opts ...ValidationOption) error {
 	}
 
 	{
-		wrap := func(e error) error { return fmt.Errorf("invalid security: %v", e) }
+		wrap := func(e error) error { return fmt.Errorf("invalid security: %w", e) }
 		if v := doc.Security; v != nil {
 			if err := v.Validate(ctx); err != nil {
 				return wrap(err)
@@ -107,7 +107,7 @@ func (doc *T) Validate(ctx context.Context, opts ...ValidationOption) error {
 	}
 
 	{
-		wrap := func(e error) error { return fmt.Errorf("invalid servers: %v", e) }
+		wrap := func(e error) error { return fmt.Errorf("invalid servers: %w", e) }
 		if v := doc.Servers; v != nil {
 			if err := v.Validate(ctx); err != nil {
 				return wrap(err)
diff --git a/openapi3/parameter.go b/openapi3/parameter.go
index f5d7d1f2f..64092538f 100644
--- a/openapi3/parameter.go
+++ b/openapi3/parameter.go
@@ -296,23 +296,23 @@ func (parameter *Parameter) Validate(ctx context.Context) error {
 	}
 	if !smSupported {
 		e := fmt.Errorf("serialization method with style=%q and explode=%v is not supported by a %s parameter", sm.Style, sm.Explode, in)
-		return fmt.Errorf("parameter %q schema is invalid: %v", parameter.Name, e)
+		return fmt.Errorf("parameter %q schema is invalid: %w", parameter.Name, e)
 	}
 
 	if (parameter.Schema == nil) == (parameter.Content == nil) {
 		e := errors.New("parameter must contain exactly one of content and schema")
-		return fmt.Errorf("parameter %q schema is invalid: %v", parameter.Name, e)
+		return fmt.Errorf("parameter %q schema is invalid: %w", parameter.Name, e)
 	}
 
 	if content := parameter.Content; content != nil {
 		if err := content.Validate(ctx); err != nil {
-			return fmt.Errorf("parameter %q content is invalid: %v", parameter.Name, err)
+			return fmt.Errorf("parameter %q content is invalid: %w", parameter.Name, err)
 		}
 	}
 
 	if schema := parameter.Schema; schema != nil {
 		if err := schema.Validate(ctx); err != nil {
-			return fmt.Errorf("parameter %q schema is invalid: %v", parameter.Name, err)
+			return fmt.Errorf("parameter %q schema is invalid: %w", parameter.Name, err)
 		}
 		if parameter.Example != nil && parameter.Examples != nil {
 			return fmt.Errorf("parameter %q example and examples are mutually exclusive", parameter.Name)
@@ -327,10 +327,10 @@ func (parameter *Parameter) Validate(ctx context.Context) error {
 		} else if examples := parameter.Examples; examples != nil {
 			for k, v := range examples {
 				if err := v.Validate(ctx); err != nil {
-					return fmt.Errorf("%s: %s", k, err)
+					return fmt.Errorf("%s: %w", k, err)
 				}
 				if err := validateExampleValue(v.Value.Value, schema.Value); err != nil {
-					return fmt.Errorf("%s: %s", k, err)
+					return fmt.Errorf("%s: %w", k, err)
 				}
 			}
 		}
diff --git a/openapi3/schema.go b/openapi3/schema.go
index c59070ee1..ded97f02a 100644
--- a/openapi3/schema.go
+++ b/openapi3/schema.go
@@ -755,7 +755,7 @@ func (schema *Schema) validate(ctx context.Context, stack []*Schema) (err error)
 
 	if x := schema.Example; x != nil && !validationOpts.ExamplesValidationDisabled {
 		if err := validateExampleValue(x, schema); err != nil {
-			return fmt.Errorf("invalid schema example: %s", err)
+			return fmt.Errorf("invalid schema example: %w", err)
 		}
 	}
 
diff --git a/openapi3/schema_formats.go b/openapi3/schema_formats.go
index 17b7564cf..51e245411 100644
--- a/openapi3/schema_formats.go
+++ b/openapi3/schema_formats.go
@@ -28,7 +28,7 @@ var SchemaStringFormats = make(map[string]Format, 4)
 func DefineStringFormat(name string, pattern string) {
 	re, err := regexp.Compile(pattern)
 	if err != nil {
-		err := fmt.Errorf("format %q has invalid pattern %q: %v", name, pattern, err)
+		err := fmt.Errorf("format %q has invalid pattern %q: %w", name, pattern, err)
 		panic(err)
 	}
 	SchemaStringFormats[name] = Format{regexp: re}
diff --git a/openapi3/security_scheme.go b/openapi3/security_scheme.go
index 52c3ef218..790b21a73 100644
--- a/openapi3/security_scheme.go
+++ b/openapi3/security_scheme.go
@@ -165,7 +165,7 @@ func (ss *SecurityScheme) Validate(ctx context.Context) error {
 			return fmt.Errorf("security scheme of type %q should have 'flows'", ss.Type)
 		}
 		if err := flow.Validate(ctx); err != nil {
-			return fmt.Errorf("security scheme 'flow' is invalid: %v", err)
+			return fmt.Errorf("security scheme 'flow' is invalid: %w", err)
 		}
 	} else if ss.Flows != nil {
 		return fmt.Errorf("security scheme of type %q can't have 'flows'", ss.Type)
diff --git a/openapi3filter/req_resp_decoder.go b/openapi3filter/req_resp_decoder.go
index a54b3bb47..73eb73e2b 100644
--- a/openapi3filter/req_resp_decoder.go
+++ b/openapi3filter/req_resp_decoder.go
@@ -654,7 +654,7 @@ func (d *cookieParamDecoder) DecodePrimitive(param string, sm *openapi3.Serializ
 		return nil, found, nil
 	}
 	if err != nil {
-		return nil, found, fmt.Errorf("decoding param %q: %s", param, err)
+		return nil, found, fmt.Errorf("decoding param %q: %w", param, err)
 	}
 
 	val, err := parsePrimitive(cookie.Value, schema)
@@ -673,7 +673,7 @@ func (d *cookieParamDecoder) DecodeArray(param string, sm *openapi3.Serializatio
 		return nil, found, nil
 	}
 	if err != nil {
-		return nil, found, fmt.Errorf("decoding param %q: %s", param, err)
+		return nil, found, fmt.Errorf("decoding param %q: %w", param, err)
 	}
 	val, err := parseArray(strings.Split(cookie.Value, ","), schema)
 	return val, found, err
@@ -691,7 +691,7 @@ func (d *cookieParamDecoder) DecodeObject(param string, sm *openapi3.Serializati
 		return nil, found, nil
 	}
 	if err != nil {
-		return nil, found, fmt.Errorf("decoding param %q: %s", param, err)
+		return nil, found, fmt.Errorf("decoding param %q: %w", param, err)
 	}
 	props, err := propsFromString(cookie.Value, ",", ",")
 	if err != nil {
@@ -753,7 +753,7 @@ func makeObject(props map[string]string, schema *openapi3.SchemaRef) (map[string
 			if v, ok := err.(*ParseError); ok {
 				return nil, &ParseError{path: []interface{}{propName}, Cause: v}
 			}
-			return nil, fmt.Errorf("property %q: %s", propName, err)
+			return nil, fmt.Errorf("property %q: %w", propName, err)
 		}
 		obj[propName] = value
 	}
@@ -771,7 +771,7 @@ func parseArray(raw []string, schemaRef *openapi3.SchemaRef) ([]interface{}, err
 			if v, ok := err.(*ParseError); ok {
 				return nil, &ParseError{path: []interface{}{i}, Cause: v}
 			}
-			return nil, fmt.Errorf("item %d: %s", i, err)
+			return nil, fmt.Errorf("item %d: %w", i, err)
 		}
 
 		// If the items are nil, then the array is nil. There shouldn't be case where some values are actual primitive
@@ -1044,7 +1044,7 @@ func multipartBodyDecoder(body io.Reader, header http.Header, schema *openapi3.S
 			if v, ok := err.(*ParseError); ok {
 				return nil, &ParseError{path: []interface{}{name}, Cause: v}
 			}
-			return nil, fmt.Errorf("part %s: %s", name, err)
+			return nil, fmt.Errorf("part %s: %w", name, err)
 		}
 		values[name] = append(values[name], value)
 	}
diff --git a/routers/legacy/router.go b/routers/legacy/router.go
index f1f47d9ed..fb8d4621e 100644
--- a/routers/legacy/router.go
+++ b/routers/legacy/router.go
@@ -60,7 +60,7 @@ type Router struct {
 // All operations of the document will be added to the router.
 func NewRouter(doc *openapi3.T) (routers.Router, error) {
 	if err := doc.Validate(context.Background()); err != nil {
-		return nil, fmt.Errorf("validating OpenAPI failed: %v", err)
+		return nil, fmt.Errorf("validating OpenAPI failed: %w", err)
 	}
 	router := &Router{doc: doc}
 	root := router.node()