diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cee2775..b0276d5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,6 +22,7 @@ jobs:
         python-version:
           - '3.12'
           - '3.13'
+          - '3.14'
 
     name: Python ${{ matrix.python-version }} on ${{ matrix.os }}
     steps:
diff --git a/pyproject.toml b/pyproject.toml
index 6c293d1..d21325d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,11 +4,11 @@ version = "1.0.0rc1"
 description = "A program to compute the ephemerides."
 authors = ["Jérôme Deuchnord <jerome@deuchnord.fr>"]
 license = "AGPL-3.0-or-later"
+readme = "README.md"
 
 include = [
-    "CHANGELOG.md",
-    "kosmorro/locales/*/LC_MESSAGES/*.mo",
-    "kosmorro/assets",
+    { path = "kosmorro/locales", format = "wheel" },
+    { path = "kosmorro/assets", format=["sdist", "wheel"] },
 ]
 
 [tool.poetry.scripts]
diff --git a/tests/dates.py b/tests/dates.py
index 94f22cd..dc4e2b5 100644
--- a/tests/dates.py
+++ b/tests/dates.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+from sys import version_info as python_version
 from .utils import execute, KOSMORRO
 
 
@@ -38,7 +39,8 @@ def test_with_incorrect_date_values():
         result = execute(KOSMORRO + arg)
         assert not result.successful
         assert (
-            result.stderr == f"The date {value} is not valid: month must be in 1..12\n"
+            result.stderr
+            == f"The date {value} is not valid: month must be in 1..12{", not 13" if python_version.minor >= 14 else ""}\n"
         )
 
 
diff --git a/tests/general.py b/tests/general.py
index 23f377d..d36c5fd 100644
--- a/tests/general.py
+++ b/tests/general.py
@@ -34,7 +34,7 @@ def test_help_message():
     for arg in ["--help", "-h"]:
         result = execute(KOSMORRO + [arg])
 
-        assert result.is_successful()
+        assert result.successful
 
         assert result.successful