diff --git a/ansys/api/additive/VERSION b/ansys/api/additive/VERSION
index 8764493..1cb900d 100644
--- a/ansys/api/additive/VERSION
+++ b/ansys/api/additive/VERSION
@@ -1 +1 @@
-1.7.0-dev2
\ No newline at end of file
+1.7.0-dev3
\ 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 661a1dc..2cd4194 100644
--- a/ansys/api/additive/v0/additive_domain.proto
+++ b/ansys/api/additive/v0/additive_domain.proto
@@ -30,7 +30,7 @@ message MeltPoolTimeStep {
 
 message MeltPool {
     repeated MeltPoolTimeStep time_steps = 1;
-    bytes thermal_history_vtk = 2;
+    string thermal_history_vtk_zip = 2;
 }
 
 message AdditiveMaterial {