diff --git a/buildserver/provision-apt-get-install b/buildserver/provision-apt-get-install
index b4855f51..a975ac74 100644
--- a/buildserver/provision-apt-get-install
+++ b/buildserver/provision-apt-get-install
@@ -38,7 +38,7 @@ fi
 
 cat << EOF > /etc/apt/sources.list
 deb ${debian_mirror} bullseye main
-deb http://security.debian.org/debian-security bullseye-security main
+deb https://security.debian.org/debian-security bullseye-security main
 deb ${debian_mirror} bullseye-updates main
 EOF
 echo "deb ${debian_mirror} bullseye-backports main" > /etc/apt/sources.list.d/backports.list