diff --git a/scripts/install b/scripts/install
index 5e33fdc..3794996 100644
--- a/scripts/install
+++ b/scripts/install
@@ -116,7 +116,7 @@ virtualenv --python=python3 --system-site-packages "${final_path}/venv"
 	set -o nounset
 
 	pip install --upgrade pip
-	pip install weboob html2text simplejson BeautifulSoup4 PyExecJS pdfminer
+	pip install weboob html2text simplejson BeautifulSoup4 PyExecJS pdfminer.six
 )
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index ce2dbe5..8460efb 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -122,7 +122,7 @@ virtualenv --python=python3 --system-site-packages "${final_path}/venv"
 	set -o nounset
 
 	pip install --upgrade pip
-	pip install weboob html2text simplejson BeautifulSoup4 PyExecJS pdfminer
+	pip install weboob html2text simplejson BeautifulSoup4 PyExecJS pdfminer.six
 )
 
 #=================================================