diff --git a/CHANGELOG.md b/CHANGELOG.md
index 196b7485e..e9425cb10 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Unreleased
 ### Changes
 - Added new steam multiblocks for the alloy smelter, compressor, forge hammer, and thermal centrifuge @Pyritie
+- Reduced the Y level that ad astra considers "space" so rocket launches are faster @Pyritie
 ### Bug fixes
 - Fixed missing crafting table recipes for greate gearboxes (#2577) @Pyritie
 ### Translation updates
diff --git a/config/ad_astra.jsonc b/config/ad_astra.jsonc
index 38ab7b500..f255b90f0 100644
--- a/config/ad_astra.jsonc
+++ b/config/ad_astra.jsonc
@@ -14,7 +14,7 @@
      * The y level where rockets should leave the dimension and enter space.
      * Type: Integer
      */
-    "atmosphereLeave": 600,
+    "atmosphereLeave": 400,
     // A comma-separated list of planet IDs that should be hidden from the planets screen. e.g. minecraft:overworld,ad_astra:moon,ad_astra:mars,ad_astra:venus,ad_astra:mercury,ad_astra:glacio
     "disabledPlanets": "",
     // Disables oxygen damage.