diff --git a/api_internal_test.go b/api_internal_test.go
index 529e7c7..214b627 100644
--- a/api_internal_test.go
+++ b/api_internal_test.go
@@ -122,7 +122,7 @@ func TestAzureFullURL(t *testing.T) {
 			"chatgpt-demo",
 			"https://httpbin.org/" +
 				"openai/deployments/chatgpt-demo" +
-				"/chat/completions?api-version=2023-03-15-preview",
+				"/chat/completions?api-version=2023-05-15",
 		},
 		{
 			"AzureBaseURLWithoutSlashOK",
@@ -131,7 +131,7 @@ func TestAzureFullURL(t *testing.T) {
 			"chatgpt-demo",
 			"https://httpbin.org/" +
 				"openai/deployments/chatgpt-demo" +
-				"/chat/completions?api-version=2023-03-15-preview",
+				"/chat/completions?api-version=2023-05-15",
 		},
 	}
 
diff --git a/config.go b/config.go
index fbcf377..c58b71e 100644
--- a/config.go
+++ b/config.go
@@ -56,7 +56,7 @@ func DefaultAzureConfig(apiKey, baseURL string) ClientConfig {
 		BaseURL:    baseURL,
 		OrgID:      "",
 		APIType:    APITypeAzure,
-		APIVersion: "2023-03-15-preview",
+		APIVersion: "2023-05-15",
 		AzureModelMapperFunc: func(model string) string {
 			return regexp.MustCompile(`[.:]`).ReplaceAllString(model, "")
 		},