diff --git a/include/openssl/aead.h b/include/openssl/aead.h
index eb51de1..38eb076 100644
--- a/include/openssl/aead.h
+++ b/include/openssl/aead.h
@@ -122,7 +122,7 @@
 OPENSSL_EXPORT const EVP_AEAD *EVP_aead_aes_256_gcm(void);
 
 // EVP_aead_chacha20_poly1305 is the AEAD built from ChaCha20 and
-// Poly1305 as described in RFC 7539.
+// Poly1305 as described in RFC 8439.
 OPENSSL_EXPORT const EVP_AEAD *EVP_aead_chacha20_poly1305(void);
 
 // EVP_aead_xchacha20_poly1305 is ChaCha20-Poly1305 with an extended nonce that
diff --git a/include/openssl/chacha.h b/include/openssl/chacha.h
index 684fc5b..cfbaa75 100644
--- a/include/openssl/chacha.h
+++ b/include/openssl/chacha.h
@@ -23,7 +23,7 @@
 
 // ChaCha20.
 //
-// ChaCha20 is a stream cipher. See https://tools.ietf.org/html/rfc7539.
+// ChaCha20 is a stream cipher. See https://tools.ietf.org/html/rfc8439.
 
 
 // CRYPTO_chacha_20 encrypts |in_len| bytes from |in| with the given key and