diff --git a/install-poetry.py b/install-poetry.py
index 2eb61b53183..4b47d82da4d 100644
--- a/install-poetry.py
+++ b/install-poetry.py
@@ -440,7 +440,7 @@ def _is_self_upgrade_supported(x):
             self.install(version)
         except subprocess.CalledProcessError as e:
             print(
-                colorize("error", f"\nAn error has occurred: {e}\n{e.stderr.decode()}")
+                colorize("error", f"\nAn error has occurred: {e}\n{e.stdout.decode()}")
             )
 
             return e.returncode