diff --git a/tests/test_process.py b/tests/test_process.py
index 13585189..d0b8bdee 100644
--- a/tests/test_process.py
+++ b/tests/test_process.py
@@ -115,7 +115,7 @@ async def test():
                 cmd, b'-W', b'ignore', '-c',
                 'import os,sys;sys.stdout.write(os.getenv("FRUIT"))',
                 stdout=subprocess.PIPE,
-                preexec_fn=lambda: os.putenv("FRUIT", "apple"))
+                env=dict(os.environ, FRUIT="apple"))
 
             out, _ = await proc.communicate()
             self.assertEqual(out, b'apple')
diff --git a/vendor/libuv b/vendor/libuv
index 988f2bfc..0c1fa696 160000
--- a/vendor/libuv
+++ b/vendor/libuv
@@ -1 +1 @@
-Subproject commit 988f2bfc4defb9a85a536a3e645834c161143ee0
+Subproject commit 0c1fa696aa502eb749c2c4735005f41ba00a27b8