diff --git a/libc/kernel/uapi/linux/tls.h b/libc/kernel/uapi/linux/tls.h
index b6910af..96bb3a5 100644
--- a/libc/kernel/uapi/linux/tls.h
+++ b/libc/kernel/uapi/linux/tls.h
@@ -27,12 +27,21 @@
 #define TLS_1_2_VERSION_MAJOR 0x3
 #define TLS_1_2_VERSION_MINOR 0x3
 #define TLS_1_2_VERSION TLS_VERSION_NUMBER(TLS_1_2)
+#define TLS_1_3_VERSION_MAJOR 0x3
+#define TLS_1_3_VERSION_MINOR 0x4
+#define TLS_1_3_VERSION TLS_VERSION_NUMBER(TLS_1_3)
 #define TLS_CIPHER_AES_GCM_128 51
 #define TLS_CIPHER_AES_GCM_128_IV_SIZE 8
 #define TLS_CIPHER_AES_GCM_128_KEY_SIZE 16
 #define TLS_CIPHER_AES_GCM_128_SALT_SIZE 4
 #define TLS_CIPHER_AES_GCM_128_TAG_SIZE 16
 #define TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE 8
+#define TLS_CIPHER_AES_GCM_256 52
+#define TLS_CIPHER_AES_GCM_256_IV_SIZE 8
+#define TLS_CIPHER_AES_GCM_256_KEY_SIZE 32
+#define TLS_CIPHER_AES_GCM_256_SALT_SIZE 4
+#define TLS_CIPHER_AES_GCM_256_TAG_SIZE 16
+#define TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE 8
 #define TLS_SET_RECORD_TYPE 1
 #define TLS_GET_RECORD_TYPE 2
 struct tls_crypto_info {
@@ -46,4 +55,11 @@
   unsigned char salt[TLS_CIPHER_AES_GCM_128_SALT_SIZE];
   unsigned char rec_seq[TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE];
 };
+struct tls12_crypto_info_aes_gcm_256 {
+  struct tls_crypto_info info;
+  unsigned char iv[TLS_CIPHER_AES_GCM_256_IV_SIZE];
+  unsigned char key[TLS_CIPHER_AES_GCM_256_KEY_SIZE];
+  unsigned char salt[TLS_CIPHER_AES_GCM_256_SALT_SIZE];
+  unsigned char rec_seq[TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE];
+};
 #endif