diff --git a/src/poetry/utils/env/base_env.py b/src/poetry/utils/env/base_env.py
index eb8dac6cf97..40ecfbe3895 100644
--- a/src/poetry/utils/env/base_env.py
+++ b/src/poetry/utils/env/base_env.py
@@ -327,6 +327,8 @@ def run_python_script(self, content: str, **kwargs: Any) -> str:
             "-I",
             "-W",
             "ignore",
+            "-X",
+            "utf8",
             "-",
             input_=content,
             stderr=subprocess.PIPE,
@@ -352,6 +354,7 @@ def _run(self, cmd: list[str], **kwargs: Any) -> str:
                     check=True,
                     env=env,
                     text=True,
+                    encoding="utf-8",
                     **kwargs,
                 ).stdout
             elif call:
diff --git a/tests/utils/test_env.py b/tests/utils/test_env.py
index dafd9af4c08..728d9dd8483 100644
--- a/tests/utils/test_env.py
+++ b/tests/utils/test_env.py
@@ -1124,6 +1124,16 @@ def test_run_python_script_only_stdout(tmp_path: Path, tmp_venv: VirtualEnv) ->
     assert "some warning" not in output
 
 
+def test_run_python_script_non_ascii_input(
+    tmp_path: Path, tmp_venv: VirtualEnv
+) -> None:
+    output = tmp_venv.run_python_script(
+        "import sys; print('👎', file=sys.stderr); print('👍')"
+    )
+    assert "👍" in output
+    assert "👎" not in output
+
+
 def test_create_venv_tries_to_find_a_compatible_python_executable_using_generic_ones_first(  # noqa: E501
     manager: EnvManager,
     poetry: Poetry,