doc: pip -U

diff --git a/doc/Makefile b/doc/Makefile
index 8db4011a30c94fd39b7f3fefd044e75d52ac261d..b1928f8d529f5841303d1e7cc39d6873a5924449 100755 (executable)
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -166,6 +166,6 @@ publish:
        true
 
 install_deps:
-       pip install $(DEPENDENCIES)
+       pip install -U $(DEPENDENCIES)
        @echo
        @echo "All dependencies installed."