diff --git a/setup/unix-ci.py b/setup/unix-ci.py
index 293c1bfdda..2a89044db3 100644
--- a/setup/unix-ci.py
+++ b/setup/unix-ci.py
@@ -107,6 +107,8 @@ def main():
             'https://download.calibre-ebook.com/ci/calibre/{}.tar.xz'.format(tball), SW
         )
         if not ismacos:
+            run('sudo', 'apt-get', 'update', '-y')
+            run('sudo', 'apt-get', 'upgrade', '-y')
             run('sudo', 'apt-get', 'install', '-y', 'gettext', 'libgl1-mesa-dev')
 
     elif action == 'bootstrap':