diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3997b13d3..57c62430c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## Changelog
 
+### `jupyter-lsp 2.2.5`
+
+- bug fixes:
+  - fix for environment variables leaking into the parent environment (#1078)
+
 ### `jupyter-lsp 2.2.4`
 
 - bug fixes:
diff --git a/python_packages/jupyter_lsp/jupyter_lsp/_version.py b/python_packages/jupyter_lsp/jupyter_lsp/_version.py
index 7bc154912..9164c78d6 100644
--- a/python_packages/jupyter_lsp/jupyter_lsp/_version.py
+++ b/python_packages/jupyter_lsp/jupyter_lsp/_version.py
@@ -1,4 +1,4 @@
 """ single source of truth for jupyter_lsp version
 """
 
-__version__ = "2.2.4"
+__version__ = "2.2.5"
diff --git a/python_packages/jupyter_lsp/jupyter_lsp/session.py b/python_packages/jupyter_lsp/jupyter_lsp/session.py
index ada89842a..70a9def06 100644
--- a/python_packages/jupyter_lsp/jupyter_lsp/session.py
+++ b/python_packages/jupyter_lsp/jupyter_lsp/session.py
@@ -6,7 +6,6 @@
 import os
 import string
 import subprocess
-from copy import copy
 from datetime import datetime, timezone
 
 from tornado.ioloop import IOLoop
@@ -161,7 +160,7 @@ def init_writer(self):
         )
 
     def substitute_env(self, env, base):
-        final_env = copy(os.environ)
+        final_env = base.copy()
 
         for key, value in env.items():
             final_env.update({key: string.Template(value).safe_substitute(base)})
diff --git a/python_packages/jupyter_lsp/jupyter_lsp/tests/test_session.py b/python_packages/jupyter_lsp/jupyter_lsp/tests/test_session.py
index 5e704550b..ff0c471c8 100644
--- a/python_packages/jupyter_lsp/jupyter_lsp/tests/test_session.py
+++ b/python_packages/jupyter_lsp/jupyter_lsp/tests/test_session.py
@@ -1,4 +1,5 @@
 import asyncio
+import os
 
 import pytest
 
@@ -100,3 +101,25 @@ async def test_ping(handlers):
     assert ws_handler._ping_sent is True
 
     ws_handler.on_close()
+
+
+@pytest.mark.asyncio
+async def test_substitute_env(handlers):
+    """should not leak environment variables"""
+    a_server = "pylsp"
+
+    handler, ws_handler = handlers
+    manager = handler.manager
+
+    manager.initialize()
+
+    await assert_status_set(handler, {"not_started"})
+
+    await ws_handler.open(a_server)
+    session = manager.sessions[ws_handler.language_server]
+    new_env = session.substitute_env({"test-variable": "value"}, os.environ)
+
+    assert "test-variable" in new_env
+    assert "test-variable" not in os.environ
+
+    ws_handler.on_close()