Update Makefile

Co-authored-by: Lisa Bock <lisa.bock@dlr.de>

Author: valeriupredoi

Makefile

@@ -7,7 +7,7 @@ export SHELL = /bin/bash
 # Settings
 MAKEFILES=Makefile $(wildcard *.mk)
 JEKYLL_VERSION=3.8.5
-JEKYLL=bundle install && bundle update && bundle exec jekyll
+JEKYLL=bundle install && bundle update --all && bundle exec jekyll
 PARSER=bin/markdown_ast.rb
 DST=_site