diff --git a/lignumis/prototypes/integrations/vanilla.lua b/lignumis/prototypes/integrations/vanilla.lua
index 704a9b8..dd7af70 100644
--- a/lignumis/prototypes/integrations/vanilla.lua
+++ b/lignumis/prototypes/integrations/vanilla.lua
@@ -224,6 +224,7 @@ robots_speed_technology_3.unit = {
     ingredients = { { "automation-science-pack", 1 }, { "logistic-science-pack", 1 }, { "chemical-science-pack", 1 } },
     time = 30
 }
+robots_speed_technology_3.upgrade = false
 
 local robots_speed_technology_4 = data.raw.technology["worker-robots-speed-4"]
 robots_speed_technology_4.prerequisites = { "worker-robots-speed-3", "utility-science-pack" }