diff -Naur a/setup.py b/setup.py
--- a/setup.py	2017-12-24 07:47:39.000000000 +0100
+++ b/setup.py	2018-01-18 10:54:20.090661863 +0100
@@ -63,7 +63,6 @@
     packages=["websocket", "websocket.tests"],
     package_data={
         'websocket.tests': ['data/*.txt'],
-        'websocket': ["cacert.pem"]
     },
     tests_require=tests_require,
     test_suite="websocket.tests"
diff -Naur a/websocket/_http.py b/websocket/_http.py
--- a/websocket/_http.py	2017-12-09 08:07:42.000000000 +0100
+++ b/websocket/_http.py	2018-01-18 10:55:01.854569515 +0100
@@ -176,8 +176,7 @@
     if os.environ.get('WEBSOCKET_CLIENT_CA_BUNDLE'):
         certPath = os.environ.get('WEBSOCKET_CLIENT_CA_BUNDLE')
     else:
-        certPath = os.path.join(
-            os.path.dirname(__file__), "cacert.pem")
+        certPath = ssl.get_default_verify_paths().cafile
     if os.path.isfile(certPath) and user_sslopt.get('ca_certs', None) is None \
             and user_sslopt.get('ca_cert', None) is None:
         sslopt['ca_certs'] = certPath
diff -Naur a/websocket_client.egg-info/SOURCES.txt b/websocket_client.egg-info/SOURCES.txt
--- a/websocket_client.egg-info/SOURCES.txt	2017-12-30 12:28:30.000000000 +0100
+++ b/websocket_client.egg-info/SOURCES.txt	2018-01-18 10:54:31.166637627 +0100
@@ -20,7 +20,6 @@
 websocket/_ssl_compat.py
 websocket/_url.py
 websocket/_utils.py
-websocket/cacert.pem
 websocket/tests/__init__.py
 websocket/tests/test_cookiejar.py
 websocket/tests/test_websocket.py