diff --git a/CHANGELOG.md b/CHANGELOG.md
index d600e391f..c65a07fc3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,6 +43,7 @@ Attention: The newest changes should be on top -->
 
 ### Fixed
 
+- BUG: Pressure ISA Extrapolation as "linear" [#675](https://github.com/RocketPy-Team/RocketPy/pull/675)
 - BUG: fix the Frequency Response plot of Flight class [#653](https://github.com/RocketPy-Team/RocketPy/pull/653)
 
 ## [v1.4.2] - 2024-08-03
diff --git a/rocketpy/environment/environment.py b/rocketpy/environment/environment.py
index 3e008c9c9..39ce18532 100644
--- a/rocketpy/environment/environment.py
+++ b/rocketpy/environment/environment.py
@@ -2382,7 +2382,7 @@ def load_international_standard_atmosphere(self):  # pragma: no cover
             DeprecationWarning,
         )
 
-    @funcify_method("Height Above Sea Level (m)", "Pressure (Pa)", "spline", "linear")
+    @funcify_method("Height Above Sea Level (m)", "Pressure (Pa)", "spline", "natural")
     def pressure_ISA(self):
         """Pressure, in Pa, as a function of height above sea level as defined
         by the `International Standard Atmosphere ISO 2533`."""