diff --git a/htsinfer/htsinfer.py b/htsinfer/htsinfer.py
index 9f2f6602..4967a4d9 100755
--- a/htsinfer/htsinfer.py
+++ b/htsinfer/htsinfer.py
@@ -315,8 +315,7 @@ def clean_up(self):
     def print(self):
         """Print results to STDOUT."""
         sys.stdout.write(
-            self.config.results.json(
+            self.config.results.model_dump_json(
                 indent=3,
-                sort_keys=False,
             ) + linesep
         )
diff --git a/tests/test_htsinfer.py b/tests/test_htsinfer.py
index 0489023b..ea6e65f7 100644
--- a/tests/test_htsinfer.py
+++ b/tests/test_htsinfer.py
@@ -305,7 +305,7 @@ def test_clean_up_keep_none(self, tmpdir):
     def test_clean_up_keep_results(self, tmpdir):
         """Remove temporary data."""
         arguments = Args(path_1=FILE_MATE_1,
-                         out_dir=tmpdir,
+                         out_dir=tmpdir.strpath,
                          tmpdir=tmpdir,
                          )
         results = Results()
@@ -323,8 +323,8 @@ def test_clean_up_keep_results(self, tmpdir):
     def test_clean_up_keep_all(self, tmpdir):
         """Remove no data."""
         arguments = Args(path_1=FILE_MATE_1,
-                         out_dir=tmpdir,
-                         tmpdir=tmpdir,
+                         out_dir=tmpdir.strpath,
+                         tmpdir=tmpdir.strpath,
                          )
         results = Results()
         configs = Config(