diff --git a/.github/docs/openapi3.txt b/.github/docs/openapi3.txt
index cfccb97a..eddcbfbd 100644
--- a/.github/docs/openapi3.txt
+++ b/.github/docs/openapi3.txt
@@ -400,8 +400,8 @@ func (content Content) Validate(ctx context.Context, opts ...ValidationOption) e
 type Discriminator struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 
-	PropertyName string            `json:"propertyName" yaml:"propertyName"` // required
-	Mapping      map[string]string `json:"mapping,omitempty" yaml:"mapping,omitempty"`
+	PropertyName string    `json:"propertyName" yaml:"propertyName"` // required
+	Mapping      StringMap `json:"mapping,omitempty" yaml:"mapping,omitempty"`
 }
     Discriminator is specified by OpenAPI/Swagger standard version 3. See
     https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#discriminator-object
@@ -873,10 +873,10 @@ type NumberFormatValidator = FormatValidator[float64]
 type OAuthFlow struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 
-	AuthorizationURL string            `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
-	TokenURL         string            `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
-	RefreshURL       string            `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
-	Scopes           map[string]string `json:"scopes" yaml:"scopes"` // required
+	AuthorizationURL string    `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
+	TokenURL         string    `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
+	RefreshURL       string    `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
+	Scopes           StringMap `json:"scopes" yaml:"scopes"` // required
 }
     OAuthFlow is specified by OpenAPI/Swagger standard version 3. See
     https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#oauth-flow-object
@@ -1983,6 +1983,10 @@ func NewRegexpFormatValidator(pattern string) StringFormatValidator
     NewRegexpFormatValidator creates a new FormatValidator that uses a regular
     expression to validate the value.
 
+type StringMap map[string]string
+    StringMap is a map[string]string that ignores the origin in the underlying
+    json representation.
+
 type T struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 
diff --git a/README.md b/README.md
index 41335937..d135ffe9 100644
--- a/README.md
+++ b/README.md
@@ -295,6 +295,9 @@ for _, path := range doc.Paths.InMatchingOrder() {
 
 ## CHANGELOG: Sub-v1 breaking API changes
 
+### v0.129.0
+* `openapi3.Discriminator.Mapping` and `openapi3.OAuthFlow.Scopes` fields went from a `map[string]string` to the new type `StringMap`
+
 ### v0.127.0
 * Downgraded `github.com/gorilla/mux` dep from `1.8.1` to `1.8.0`.
 
diff --git a/openapi3/discriminator.go b/openapi3/discriminator.go
index e8193bd9..16d24400 100644
--- a/openapi3/discriminator.go
+++ b/openapi3/discriminator.go
@@ -10,8 +10,8 @@ import (
 type Discriminator struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 
-	PropertyName string            `json:"propertyName" yaml:"propertyName"` // required
-	Mapping      map[string]string `json:"mapping,omitempty" yaml:"mapping,omitempty"`
+	PropertyName string    `json:"propertyName" yaml:"propertyName"` // required
+	Mapping      StringMap `json:"mapping,omitempty" yaml:"mapping,omitempty"`
 }
 
 // MarshalJSON returns the JSON encoding of Discriminator.
diff --git a/openapi3/security_scheme.go b/openapi3/security_scheme.go
index b5c94b61..b37a6eda 100644
--- a/openapi3/security_scheme.go
+++ b/openapi3/security_scheme.go
@@ -317,10 +317,10 @@ func (flows *OAuthFlows) Validate(ctx context.Context, opts ...ValidationOption)
 type OAuthFlow struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 
-	AuthorizationURL string            `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
-	TokenURL         string            `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
-	RefreshURL       string            `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
-	Scopes           map[string]string `json:"scopes" yaml:"scopes"` // required
+	AuthorizationURL string    `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
+	TokenURL         string    `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
+	RefreshURL       string    `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
+	Scopes           StringMap `json:"scopes" yaml:"scopes"` // required
 }
 
 // MarshalJSON returns the JSON encoding of OAuthFlow.
diff --git a/openapi3/stringmap.go b/openapi3/stringmap.go
new file mode 100644
index 00000000..3819851c
--- /dev/null
+++ b/openapi3/stringmap.go
@@ -0,0 +1,4 @@
+package openapi3
+
+// StringMap is a map[string]string that ignores the origin in the underlying json representation.
+type StringMap map[string]string