diff --git a/go.mod b/go.mod
index e3f8f4c..3ba7c99 100644
--- a/go.mod
+++ b/go.mod
@@ -13,7 +13,7 @@ require (
 	github.com/stretchr/testify v1.10.0
 	github.com/tidwall/gjson v1.18.0
 	github.com/tidwall/pretty v1.2.1
-	github.com/trycourier/courier-go/v4 v4.29.0
+	github.com/trycourier/courier-go/v4 v4.30.1
 	github.com/urfave/cli-docs/v3 v3.0.0-alpha6
 	github.com/urfave/cli/v3 v3.3.2
 	golang.org/x/sys v0.38.0
diff --git a/go.sum b/go.sum
index 7b3d32e..978803a 100644
--- a/go.sum
+++ b/go.sum
@@ -65,8 +65,8 @@ github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
 github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
 github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
 github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
-github.com/trycourier/courier-go/v4 v4.29.0 h1:I8peKKW+4faENIbxmFN7G3yCrnst8yRXnWLQyxnfo5k=
-github.com/trycourier/courier-go/v4 v4.29.0/go.mod h1:0ZQyZUNupRxUytcf9bLyIjCyssOKl0vT+wqjjaMaw6k=
+github.com/trycourier/courier-go/v4 v4.30.1 h1:CiSbK6tsknUe0MjhNkz3A3zYwZvDCsfofLcbq3SqiuI=
+github.com/trycourier/courier-go/v4 v4.30.1/go.mod h1:0ZQyZUNupRxUytcf9bLyIjCyssOKl0vT+wqjjaMaw6k=
 github.com/urfave/cli-docs/v3 v3.0.0-alpha6 h1:w/l/N0xw1rO/aHRIGXJ0lDwwYFOzilup1qGvIytP3BI=
 github.com/urfave/cli-docs/v3 v3.0.0-alpha6/go.mod h1:p7Z4lg8FSTrPB9GTaNyTrK3ygffHZcK3w0cU2VE+mzU=
 github.com/urfave/cli/v3 v3.3.2 h1:BYFVnhhZ8RqT38DxEYVFPPmGFTEf7tJwySTXsVRrS/o=
diff --git a/gosdk/internal/version.go b/gosdk/internal/version.go
index 22a6969..25804f0 100644
--- a/gosdk/internal/version.go
+++ b/gosdk/internal/version.go
@@ -2,4 +2,4 @@
 
 package internal
 
-const PackageVersion = "4.29.0" // x-release-please-version
+const PackageVersion = "4.30.1" // x-release-please-version
diff --git a/gosdk/shared/shared.go b/gosdk/shared/shared.go
index 3ef1af6..18fbac4 100644
--- a/gosdk/shared/shared.go
+++ b/gosdk/shared/shared.go
@@ -956,7 +956,7 @@ type ElementalImageNode struct {
 	// Any of "center", "left", "right", "full".
 	Align Alignment `json:"align" api:"nullable"`
 	// Alternate text for the image.
-	AltText string `json:"altText" api:"nullable"`
+	AltText string `json:"alt_text" api:"nullable"`
 	// CSS border color applied to the image. For example, `#ccc`
 	BorderColor string `json:"border_color" api:"nullable"`
 	// CSS border width applied to the image. For example, `1px`
@@ -1005,7 +1005,7 @@ type ElementalImageNodeParam struct {
 	// The alignment of the image.
 	Align Alignment `json:"align,omitzero"`
 	// Alternate text for the image.
-	AltText param.Opt[string] `json:"altText,omitzero"`
+	AltText param.Opt[string] `json:"alt_text,omitzero"`
 	// CSS border color applied to the image. For example, `#ccc`
 	BorderColor param.Opt[string] `json:"border_color,omitzero"`
 	// CSS border width applied to the image. For example, `1px`
@@ -1226,7 +1226,7 @@ type ElementalNodeUnion struct {
 	// This field is from variant [ElementalImageNodeWithType].
 	Src string `json:"src"`
 	// This field is from variant [ElementalImageNodeWithType].
-	AltText     string `json:"altText"`
+	AltText     string `json:"alt_text"`
 	BorderColor string `json:"border_color"`
 	BorderSize  string `json:"border_size"`
 	Href        string `json:"href"`
@@ -1793,7 +1793,7 @@ type ElementalQuoteNode struct {
 	// Any of "center", "left", "right", "full".
 	Align Alignment `json:"align" api:"nullable"`
 	// CSS border color property. For example, `#fff`
-	BorderColor string `json:"borderColor" api:"nullable"`
+	BorderColor string `json:"border_color" api:"nullable"`
 	// CSS px font size for this quote block, e.g. `16px`. Overrides the size of the
 	// `text_style` preset. Email only.
 	FontSize string `json:"font_size" api:"nullable"`
@@ -1843,7 +1843,7 @@ type ElementalQuoteNodeParam struct {
 	// Alignment of the quote.
 	Align Alignment `json:"align,omitzero"`
 	// CSS border color property. For example, `#fff`
-	BorderColor param.Opt[string] `json:"borderColor,omitzero"`
+	BorderColor param.Opt[string] `json:"border_color,omitzero"`
 	// CSS px font size for this quote block, e.g. `16px`. Overrides the size of the
 	// `text_style` preset. Email only.
 	FontSize param.Opt[string] `json:"font_size,omitzero"`