diff --git a/lignumis/prototypes/content/technology.lua b/lignumis/prototypes/content/technology.lua
index fa19344..d0f7dee 100644
--- a/lignumis/prototypes/content/technology.lua
+++ b/lignumis/prototypes/content/technology.lua
@@ -3,7 +3,6 @@ data:extend({
         type = "technology",
         name = "planet-discovery-lignumis",
         icons = PlanetsLib.technology_icons_moon(Lignumis.graphics .. "technology/lignumis.png", 256),
-        essential = true,
         effects = {
             {
                 type = "unlock-space-location",
@@ -117,7 +116,6 @@ data:extend({
         name = "iron-processing",
         icon = "__base__/graphics/icons/iron-plate.png",
         icon_size = 64,
-        essential = true,
         effects = {
             {
                 type = "unlock-recipe",
@@ -143,7 +141,6 @@ data:extend({
         name = "copper-processing",
         icon = "__base__/graphics/icons/copper-plate.png",
         icon_size = 64,
-        essential = true,
         effects = {
             {
                 type = "unlock-recipe",