diff --git a/changelog.txt b/changelog.txt
index 707476c..3b5dc5f 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,4 +1,11 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.7.2
+Date: 2021-06-26
+  Changes:
+    - Tweak solar cell recipe, less silicon
+  Features:
+    - Transport drone circuits
+---------------------------------------------------------------------------------------------------
 Version: 0.7.1
 Date: 2021-06-16
   Features:
diff --git a/recipe-updates.lua b/recipe-updates.lua
index fca7d9d..e25a3f8 100644
--- a/recipe-updates.lua
+++ b/recipe-updates.lua
@@ -116,6 +116,15 @@ util.add_ingredient("power-meter-combinator", "optical-fiber", 1)
 util.add_ingredient("ghost-scanner", "optical-fiber", 1)
 util.add_ingredient("item-sensor", "optical-fiber", 1)
 
+-- Transport Drones
+util.add_ingredient("road-network-reader", "optical-fiber", 5)
+util.replace_some_ingredient("road-network-reader", "electronic-circuit", 5, "silicon", 5)
+util.add_ingredient("transport-depot-reader", "optical-fiber", 5)
+util.replace_some_ingredient("transport-depot-reader", "electronic-circuit", 5, "silicon", 5)
+util.add_ingredient("transport-depot-writer", "optical-fiber", 5)
+util.replace_some_ingredient("transport-depot-writer", "electronic-circuit", 5, "silicon", 5)
+
+
 util.add_prerequisite("circuit-network", "fiber-optics")
 util.add_prerequisite("circuit-network", util.silicon_processing)