diff --git a/ansys/api/additive/VERSION b/ansys/api/additive/VERSION
index 2178b61..83b57fc 100644
--- a/ansys/api/additive/VERSION
+++ b/ansys/api/additive/VERSION
@@ -1 +1 @@
-1.6.0-dev3
\ No newline at end of file
+1.6.0-dev4
\ No newline at end of file
diff --git a/ansys/api/additive/v0/additive_domain.proto b/ansys/api/additive/v0/additive_domain.proto
index db28b50..cbcf86f 100644
--- a/ansys/api/additive/v0/additive_domain.proto
+++ b/ansys/api/additive/v0/additive_domain.proto
@@ -281,7 +281,7 @@ message Microstructure3DInput {
     optional InitialMicrostructureInput initial_microstructure_input = 28;
     optional MachineSettings machine = 29;
     optional AdditiveMaterial material = 30;
-    optional double use_provided_initial_microstructure_data = 31;
+    optional bool use_provided_initial_microstructure_data = 31;
 }
 
 message Microstructure3DResult {