diff --git a/tests/test_tls.py b/tests/test_tls.py
index a980a9e..8a8908b 100644
--- a/tests/test_tls.py
+++ b/tests/test_tls.py
@@ -10,6 +10,7 @@ HOST = "www.hantim.net"
 
 def test_tls13_works():
     ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+    ctx.load_default_certs()
     ctx.minimum_version = ssl.TLSVersion.TLSv1_3
     ctx.maximum_version = ssl.TLSVersion.TLSv1_3
     with ctx.wrap_socket(socket.create_connection((HOST, 443)), server_hostname=HOST) as s:
@@ -18,6 +19,7 @@ def test_tls13_works():
 
 def test_tls12_works():
     ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+    ctx.load_default_certs()
     ctx.minimum_version = ssl.TLSVersion.TLSv1_2
     ctx.maximum_version = ssl.TLSVersion.TLSv1_2
     with ctx.wrap_socket(socket.create_connection((HOST, 443)), server_hostname=HOST) as s: