diff --git a/changelog.txt b/changelog.txt
index 570c366..cfcc3ef 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,8 @@
+---------------------------------------------------------------------------------------------------
+Version: 3.1.1
+  Bugfixes:
+    - Fixed enemy ending tier level of 10 would crash on startup
+
 ---------------------------------------------------------------------------------------------------
 Version: 3.1.0
   Improvements:
diff --git a/prototypes/SwarmUtils.lua b/prototypes/SwarmUtils.lua
index d37b1d0..e793b8c 100644
--- a/prototypes/SwarmUtils.lua
+++ b/prototypes/SwarmUtils.lua
@@ -439,7 +439,7 @@ local hiveAttributeNumeric = {
     ["spawningCooldownStart"] = { 2485, 2465, 2445, 2425, 2405, 2390, 2370, 2350, 2330, 2310 },
     ["spawningRadius"] = { 10, 13, 15, 17, 20, 23, 26, 29, 32, 35 },
     ["spawningSpacing"] = { 5, 5, 5, 6, 6, 6, 7, 7, 7, 8 },
-    ["spawningCooldownEnd"] = { 890, 887, 885, 882, 880, 877, 875, 872, 870 },
+    ["spawningCooldownEnd"] = { 892, 890, 887, 885, 882, 880, 877, 875, 872, 870 },
     ["unitsToSpawn"] = { 3000, 3000, 300, 3000, 3000, 3000, 3000, 3000, 3000, 3000 },
     ["scale"] = { 1.0, 1.05, 1.1, 1.15, 1.20, 1.25, 1.30, 1.35, 1.4, 1.45 },
     ["unitsOwned"] = { 7, 7, 8, 8, 9, 9, 10, 10, 11, 11 },