diff --git a/quiche/common/quiche_feature_flags_list.h b/quiche/common/quiche_feature_flags_list.h
index 491c09f..3d29a68 100755
--- a/quiche/common/quiche_feature_flags_list.h
+++ b/quiche/common/quiche_feature_flags_list.h
@@ -41,7 +41,7 @@
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_enforce_immediate_goaway, false, true, "If true, QUIC will support sending immediate GOAWAYS and will refuse streams above the limit.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_enobufs_blocked, true, true, "If true, ENOBUFS socket errors are reported as socket blocked instead of socket failure.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_fin_before_completed_http_headers, false, true, "If true, close the connection with error if FIN is received before finish receiving the whole HTTP headers.")
-QUICHE_FLAG(bool, quiche_reloadable_flag_quic_fix_mtu_discovery, false, true, "If true, fix a externally reported bug in QUIC MTU discovery.")
+QUICHE_FLAG(bool, quiche_reloadable_flag_quic_fix_mtu_discovery, true, true, "If true, fix a externally reported bug in QUIC MTU discovery.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_fix_timeouts, true, true, "If true, postpone setting handshake timeout to infinite to handshake complete.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_include_datagrams_in_willing_to_write, false, false, "If true, checks for queued datagrams when determining if a connection is willing to write.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_maybe_copy_datagram_frames, false, true, "If true, maybe copy datagram frames in QuicUnackedPacketMap.")
@@ -66,7 +66,7 @@
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_use_received_client_addresses_cache, true, true, "If true, use a LRU cache to record client addresses of packets received on server's original address.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_client_cert_support, false, true, "If true, enables dynamic client certs in QUIC.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_dispatcher_close_connection_on_invalid_ack, false, false, "An invalid ack is an ack that the peer sent for a packet that was not sent by the dispatcher. If true, the dispatcher will close the connection if it receives an invalid ack.")
-QUICHE_FLAG(bool, quiche_restart_flag_quic_set_credential_ex_data, false, true, "If true, TlsServerConnection::AddCertChain will add CredentialExData as the ex_data of the SSL_CREDENTIAL.")
+QUICHE_FLAG(bool, quiche_restart_flag_quic_set_credential_ex_data, true, true, "If true, TlsServerConnection::AddCertChain will add CredentialExData as the ex_data of the SSL_CREDENTIAL.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_shed_tls_handshake_config, true, true, "If true, QUIC connections will call SSL_set_shed_handshake_config to drop BoringSSL handshake state after the handshake finishes in order to save memory.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_support_release_time_for_gso, false, false, "If true, QuicGsoBatchWriter will support release time if it is available and the process has the permission to do so.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_testonly_default_false, false, false, "A testonly restart flag that will always default to false.")