diff --git a/pytest_jsonreport/plugin.py b/pytest_jsonreport/plugin.py
index 6ee4ea5..f768d69 100644
--- a/pytest_jsonreport/plugin.py
+++ b/pytest_jsonreport/plugin.py
@@ -7,6 +7,7 @@
 import time
 import warnings
 
+from pytest_metadata.plugin import metadata_key
 import pytest
 import _pytest.hookspec
 
@@ -228,7 +229,7 @@ def pytest_sessionfinish(self, session):
             duration=time.time() - self._start_time,
             exitcode=session.exitstatus,
             root=str(session.fspath),
-            environment=getattr(self._config, '_metadata', {}),
+            environment=self._config.stash.get(metadata_key, {}),
             summary=serialize.make_summary(self._json_tests, **summary_data),
         )
         if not self._config.option.json_report_summary:
diff --git a/setup.py b/setup.py
index 563fc6d..a60504f 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
     license='MIT',
     install_requires=[
         'pytest>=3.8.0',
-        'pytest-metadata',
+        'pytest-metadata>=3.0.0',
     ],
     entry_points={
         'pytest11': [