diff --git a/python-pytest-grpc.spec b/python-pytest-grpc.spec
index df3a68e..4d0aacb 100644
--- a/python-pytest-grpc.spec
+++ b/python-pytest-grpc.spec
@@ -28,6 +28,7 @@ BuildRequires:  %{python_module grpcio}
 BuildRequires:  %{python_module pip}
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  %{python_module wheel}
+BuildRequires:  ca-certificates-mozilla
 BuildRequires:  python-rpm-macros
 # SECTION test requirements
 BuildRequires:  %{python_module pytest >= 3.6.0}