diff --git a/pkg/api/http_client.go b/pkg/api/http_client.go
index 2195306..c2f0d79 100644
--- a/pkg/api/http_client.go
+++ b/pkg/api/http_client.go
@@ -22,6 +22,8 @@ import (
 const (
 	accept          = "Accept"
 	authorization   = "Authorization"
+	apiVersion      = "X-GitHub-Api-Version"
+	apiVersionValue = "2022-11-28"
 	contentType     = "Content-Type"
 	github          = "github.com"
 	jsonContentType = "application/json; charset=utf-8"
@@ -112,7 +114,7 @@ func NewHTTPClient(opts ClientOptions) (*http.Client, error) {
 		opts.Headers = map[string]string{}
 	}
 	if !opts.SkipDefaultHeaders {
-		resolveHeaders(opts.Headers)
+		setDefaultHeaders(opts.Headers)
 	}
 	transport = newHeaderRoundTripper(opts.Host, opts.AuthToken, opts.Headers, transport)
 
@@ -141,7 +143,7 @@ type headerRoundTripper struct {
 	rt      http.RoundTripper
 }
 
-func resolveHeaders(headers map[string]string) {
+func setDefaultHeaders(headers map[string]string) {
 	if _, ok := headers[contentType]; !ok {
 		headers[contentType] = jsonContentType
 	}
@@ -163,6 +165,9 @@ func resolveHeaders(headers map[string]string) {
 			headers[timeZone] = tz
 		}
 	}
+	if _, ok := headers[apiVersion]; !ok {
+		headers[apiVersion] = apiVersionValue
+	}
 	if _, ok := headers[accept]; !ok {
 		// Preview for PullRequest.mergeStateStatus.
 		a := "application/vnd.github.merge-info-preview+json"
diff --git a/pkg/api/http_client_test.go b/pkg/api/http_client_test.go
index 19c911d..e7cb4df 100644
--- a/pkg/api/http_client_test.go
+++ b/pkg/api/http_client_test.go
@@ -122,6 +122,7 @@ func TestNewHTTPClient(t *testing.T) {
 			wantHeaders: func() http.Header {
 				h := defaultHeaders()
 				h.Del(accept)
+				h.Del(apiVersion)
 				h.Del(contentType)
 				h.Del(timeZone)
 				h.Del(userAgent)
@@ -169,6 +170,7 @@ func defaultHeaders() http.Header {
 	h := http.Header{}
 	a := "application/vnd.github.merge-info-preview+json"
 	a += ", application/vnd.github.nebula-preview"
+	h.Set(apiVersion, apiVersionValue)
 	h.Set(contentType, jsonContentType)
 	h.Set(userAgent, "go-gh")
 	h.Set(authorization, fmt.Sprintf("token %s", "oauth_token"))