1 files changed, 7 insertions, 7 deletions
diff --git a/src/ruby/bin/math.proto b/src/ruby/bin/math.proto
index de18a50260..c49787ad54 100755
--- a/src/ruby/bin/math.proto
+++ b/src/ruby/bin/math.proto
@@ -1,15 +1,15 @@
-syntax = "proto2";
+syntax = "proto3";
 
 package math;
 
 message DivArgs {
-  required int64 dividend = 1;
-  required int64 divisor = 2;
+  optional int64 dividend = 1;
+  optional int64 divisor = 2;
 }
 
 message DivReply {
-  required int64 quotient = 1;
-  required int64 remainder = 2;
+  optional int64 quotient = 1;
+  optional int64 remainder = 2;
 }
 
 message FibArgs {
@@ -17,11 +17,11 @@ message FibArgs {
 }
 
 message Num {
-  required int64 num = 1;
+  optional int64 num = 1;
 }
 
 message FibReply {
-  required int64 count = 1;
+  optional int64 count = 1;
 }
 
 service Math {