diff --git a/pandarallel/__init__.py b/pandarallel/__init__.py
index 5ed4742..dfea33e 100644
--- a/pandarallel/__init__.py
+++ b/pandarallel/__init__.py
@@ -1,3 +1,3 @@
-__version__ = "1.4.1"
+__version__ = "1.4.2"
 
 from .pandarallel import pandarallel
diff --git a/pandarallel/pandarallel.py b/pandarallel/pandarallel.py
index 12a6bec..04bc746 100644
--- a/pandarallel/pandarallel.py
+++ b/pandarallel/pandarallel.py
@@ -372,6 +372,7 @@ def closure(data, func, *args, **kwargs):
             )
 
             map_result = pool.map_async(global_worker, workers_args)
+            pool.close()
 
             results = get_workers_result(
                 use_memory_fs,
diff --git a/setup.py b/setup.py
index 954ba9b..2bd05fc 100644
--- a/setup.py
+++ b/setup.py
@@ -4,13 +4,13 @@
 
 setup(
     name="pandarallel",
-    version="1.4.1",
+    version="1.4.2",
     python_requires=">=3.5",
     packages=find_packages(),
     author="Manu NALEPA",
     author_email="nalepae@gmail.com",
     description="An easy to use library to speed up computation (by parallelizing on multi CPUs) with pandas.",
-    long_description="See https://github.com/nalepae/pandarallel/tree/v1.4.1 for complete user guide.",
+    long_description="See https://github.com/nalepae/pandarallel/tree/v1.4.2 for complete user guide.",
     url="https://github.com/nalepae/pandarallel",
     install_requires=install_requires,
     license="BSD",