diff --git a/install-poetry.py b/install-poetry.py
index 7c9796b..9980ff5 100644
--- a/install-poetry.py
+++ b/install-poetry.py
@@ -584,7 +584,8 @@ class Installer:
 
         subprocess.run(
             [str(python), "-m", "pip", "install", specification],
-            capture_output=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
             check=True,
         )