diff --git a/sdk/template.go b/sdk/template.go
index 1e1e8e1..695b073 100644
--- a/sdk/template.go
+++ b/sdk/template.go
@@ -13,7 +13,7 @@ type Template struct {
 	Generation string            `json:"generation,omitempty"`
 	UpdatedAt  string            `json:"updated_at,omitempty"` //nolint:tagliatelle
 	Versions   []TemplateVersion `json:"versions,omitempty"`
-	Warnings   []string          `json:"warnings,omitempty"`
+	Warning    Warning           `json:"warning,omitempty"`
 }
 
 type Templates struct {
diff --git a/sdk/template_version.go b/sdk/template_version.go
index aa90166..ea99719 100644
--- a/sdk/template_version.go
+++ b/sdk/template_version.go
@@ -8,19 +8,23 @@ import (
 
 // TemplateVersion is a Sendgrid transactional template version.
 type TemplateVersion struct {
-	ID                   string   `json:"id,omitempty"`
-	TemplateID           string   `json:"template_id,omitempty"`   //nolint:tagliatelle
-	UpdatedAt            string   `json:"updated_at,omitempty"`    //nolint:tagliatelle
-	ThumbnailURL         string   `json:"thumbnail_url,omitempty"` //nolint:tagliatelle
-	Warnings             []string `json:"warnings,omitempty"`
-	Active               int      `json:"active,omitempty"`
-	Name                 string   `json:"name,omitempty"`
-	HTMLContent          string   `json:"html_content,omitempty"`           //nolint:tagliatelle
-	PlainContent         string   `json:"plain_content,omitempty"`          //nolint:tagliatelle
-	GeneratePlainContent bool     `json:"generate_plain_content,omitempty"` //nolint:tagliatelle
-	Subject              string   `json:"subject,omitempty"`
-	Editor               string   `json:"editor,omitempty"`
-	TestData             string   `json:"test_data,omitempty"` //nolint:tagliatelle
+	ID                   string    `json:"id,omitempty"`
+	TemplateID           string    `json:"template_id,omitempty"`   //nolint:tagliatelle
+	UpdatedAt            string    `json:"updated_at,omitempty"`    //nolint:tagliatelle
+	ThumbnailURL         string    `json:"thumbnail_url,omitempty"` //nolint:tagliatelle
+	Warnings             []Warning `json:"warning,omitempty"`
+	Active               int       `json:"active,omitempty"`
+	Name                 string    `json:"name,omitempty"`
+	HTMLContent          string    `json:"html_content,omitempty"`           //nolint:tagliatelle
+	PlainContent         string    `json:"plain_content,omitempty"`          //nolint:tagliatelle
+	GeneratePlainContent bool      `json:"generate_plain_content,omitempty"` //nolint:tagliatelle
+	Subject              string    `json:"subject,omitempty"`
+	Editor               string    `json:"editor,omitempty"`
+	TestData             string    `json:"test_data,omitempty"` //nolint:tagliatelle
+}
+
+type Warning struct {
+	Message string `json:"message,omitempty"`
 }
 
 func parseTemplateVersion(respBody string) (*TemplateVersion, error) {