diff --git a/flojoy/flojoy_node_venv.py b/flojoy/flojoy_node_venv.py
index 8c6a1dd..e43db2c 100644
--- a/flojoy/flojoy_node_venv.py
+++ b/flojoy/flojoy_node_venv.py
@@ -23,6 +23,7 @@ def TORCH_NODE(default: Matrix) -> Matrix:
 import importlib.metadata
 import logging
 import multiprocessing
+import multiprocessing.connection
 import os
 import shutil
 import subprocess
@@ -90,7 +91,7 @@ def _get_venv_syspath(venv_executable: os.PathLike) -> list[str]:
 
 class PickleableFunctionWithPipeIO:
     """A wrapper for a function that can be pickled and executed in a child process."""
-    def __init__(self, func_serialized, child_conn, venv_executable):
+    def __init__(self, func_serialized: bytes, child_conn: multiprocessing.connection.Connection, venv_executable: str):
         self._func_serialized = func_serialized
         self._child_conn = child_conn
         self._venv_executable = venv_executable
@@ -105,7 +106,7 @@ def __call__(self, *args_serialized, **kwargs_serialized):
             except Exception as e:
                 result = (e, traceback.format_exception(type(e), e, e.__traceback__))
         serialized_result = cloudpickle.dumps(result)
-        self._child_conn.send(serialized_result)
+        self._child_conn.send_bytes(serialized_result)
 
 def _get_venv_executable_path(venv_path: os.PathLike | str) -> os.PathLike | str:
     """Get the path to the python executable of the virtual environment."""
@@ -187,7 +188,7 @@ def wrapper(*args, **kwargs):
                 # Start the process
                 process.start()
                 # Fetch result from the child process
-                serialized_result = parent_conn.recv()
+                serialized_result = parent_conn.recv_bytes()
                 # Wait for the process to finish
                 process.join()
             # Check if the process sent an exception with a traceback
diff --git a/setup.py b/setup.py
index b6b1ed3..4b784b3 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
     name="flojoy",
     packages=find_packages(exclude=["tests"]),
     package_data={"flojoy": ["__init__.pyi"]},
-    version="0.1.5-dev14",
+    version="0.1.5-dev15",
     license="MIT",
     description="Python client library for Flojoy.",
     author="flojoy",