1 files changed, 1 insertions, 1 deletions
diff --git a/build.sc b/build.sc
index 8ae16e39..416774d0 100644
--- a/build.sc
+++ b/build.sc
@@ -113,7 +113,7 @@ class firrtlCrossModule(val crossScalaVersion: String) extends CrossSbtModule wi
   }
 
   /* protoc */
-  def protocVersion = "3.5.1"
+  def protocVersion = "3.15.6"
 
   def protobufSource = T.source {
     millSourcePath / "src" / "main" / "proto" / "firrtl.proto"