diff --git a/envoy/COMMIT b/envoy/COMMIT
index 0bddaac59..bfd35944a 100644
--- a/envoy/COMMIT
+++ b/envoy/COMMIT
@@ -1 +1 @@
-8f6b405d32f3f908000771627a38712455c861bf
+5ff9f03e3af26fad5fd444a4a166c7d8d9b44ffc
diff --git a/envoy/config/accesslog/v3/accesslog.pb.go b/envoy/config/accesslog/v3/accesslog.pb.go
index f434e6d40..65b15b123 100755
--- a/envoy/config/accesslog/v3/accesslog.pb.go
+++ b/envoy/config/accesslog/v3/accesslog.pb.go
@@ -1514,10 +1514,10 @@ var file_envoy_config_accesslog_v3_accesslog_proto_rawDesc = []byte{
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@@ -1526,85 +1526,86 @@ var file_envoy_config_accesslog_v3_accesslog_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/envoy/config/accesslog/v3/accesslog.pb.validate.go b/envoy/config/accesslog/v3/accesslog.pb.validate.go
index 746f6f2c4..2d6af4c3c 100755
--- a/envoy/config/accesslog/v3/accesslog.pb.validate.go
+++ b/envoy/config/accesslog/v3/accesslog.pb.validate.go
@@ -2108,7 +2108,7 @@ func (m *ResponseFlagFilter) validate(all bool) error {
 		if _, ok := _ResponseFlagFilter_Flags_InLookup[item]; !ok {
 			err := ResponseFlagFilterValidationError{
 				field:  fmt.Sprintf("Flags[%v]", idx),
-				reason: "value must be in list [LH UH UT LR UR UF UC UO NR DI FI RL UAEX RLSE DC URX SI IH DPE UMSDR RFCF NFCF DT UPE NC OM DF DO DR]",
+				reason: "value must be in list [LH UH UT LR UR UF UC UO NR DI FI RL UAEX RLSE DC URX SI IH DPE UMSDR RFCF NFCF DT UPE NC OM DF DO DR UDO]",
 			}
 			if !all {
 				return err
@@ -2228,6 +2228,7 @@ var _ResponseFlagFilter_Flags_InLookup = map[string]struct{}{
 	"DF":    {},
 	"DO":    {},
 	"DR":    {},
+	"UDO":   {},
 }
 
 // Validate checks the field values on GrpcStatusFilter with the rules defined