diff --git a/lxml/lxml.SlackBuild b/lxml/lxml.SlackBuild
index 5baf867..4c6e5a7 100644
--- a/lxml/lxml.SlackBuild
+++ b/lxml/lxml.SlackBuild
@@ -25,7 +25,7 @@
 # Modified by Willy Sudiarto Raharjo for CSB Project
 
 PRGNAM=lxml
-VERSION=${VERSION:-3.8.0}
+VERSION=${VERSION:-4.0.0}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_csb}
 
@@ -71,6 +71,8 @@ find -L . \
 
 python setup.py build --with-unicode-strings
 python setup.py install --skip-build --root=$PKG
+python3 setup.py build --with-unicode-strings
+python3 setup.py install --skip-build --root=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true