diff --git a/src/simulator/crates/mc-city/src/city.rs b/src/simulator/crates/mc-city/src/city.rs
index 9bb11188..07c8799e 100644
--- a/src/simulator/crates/mc-city/src/city.rs
+++ b/src/simulator/crates/mc-city/src/city.rs
@@ -318,12 +318,11 @@ impl City {
         yields.food += 3.0;
         yields.production += 2.0;
         yields.gold += 3.0;
-        // Science baseline 3.0 (was 1.0): tech costs in age-of-dwarves scale
+        // Science baseline 5.0 (was 1.0): tech costs in age-of-dwarves scale
         // 20..320 across a 50-tech tree, so 1 sci/turn/city caps empires at
-        // ~7 techs by T150. 3 sci/turn/city lets a single city reach tier-3
-        // techs unassisted, and a 2-city empire with a library hits the
-        // target pace of 20 techs by T150.
-        yields.science += 3.0;
+        // ~7 techs by T150. 5 sci/turn/city reaches the ≥20 techs/150-turn
+        // target from a single city even without library; library adds +2.
+        yields.science += 5.0;
         yields.culture += 2.0;
 
         // Sum worked tile yields
@@ -695,11 +694,11 @@ mod tests {
     fn yields_include_city_center_baseline() {
         let city = City::found("Ironhold", (5, 5), true, 1);
         let yields = city.get_yields(&[]);
-        // City center: 4 food, 2 production, 3 gold, 3 science, 2 culture
+        // City center: 4 food, 2 production, 3 gold, 5 science, 2 culture
         assert_eq!(yields.food, 4.0);
         assert_eq!(yields.production, 2.0);
         assert_eq!(yields.gold, 3.0);
-        assert_eq!(yields.science, 3.0);
+        assert_eq!(yields.science, 5.0);
         assert_eq!(yields.culture, 2.0);
     }