diff --git a/README.rst b/README.rst
index 2f4a8d2..f3f1bb0 100644
--- a/README.rst
+++ b/README.rst
@@ -55,7 +55,7 @@ All these commande line tools have a **-h** option that explains how to use them
 Licence
 =======
 
-This library is published under the BSD licence (same licence as `PyPDF2 <http://mstamy2.github.io/PyPDF2/>`_ on which this lib depends).
+This library is published under the BSD licence (same licence as `PyPDF4 <https://github.com/claird/PyPDF4/>`_ on which this lib depends).
 
 Contributors
 ============
@@ -65,6 +65,10 @@ Contributors
 Changelog
 =========
 
+* Version 1.0 dated 2019-01-26
+
+  * Use PyPDF4 instead of PyPDF2, because there are no new releases of PyPDF2 since May 2016 (cf https://github.com/mstamy2/PyPDF2/wiki/State-of-PyPDF2-and-Future-Plans), and we need a recent version of PyPDF2 to be able to generate fully compliant PDF/A-3 files.
+
 * Version 0.9 dated 2019-01-25
 
   * Port to python 3 contributed by JoshuaJan (https://github.com/joshuajan)
diff --git a/facturx/facturx.py b/facturx/facturx.py
index 4f88010..526d324 100644
--- a/facturx/facturx.py
+++ b/facturx/facturx.py
@@ -33,10 +33,10 @@ from io import BytesIO
 from lxml import etree
 from tempfile import NamedTemporaryFile
 from datetime import datetime
-from PyPDF2 import PdfFileWriter, PdfFileReader
-from PyPDF2.generic import DictionaryObject, DecodedStreamObject,\
+from PyPDF4 import PdfFileWriter, PdfFileReader
+from PyPDF4.generic import DictionaryObject, DecodedStreamObject,\
     NameObject, createStringObject, ArrayObject
-from PyPDF2.utils import b_
+from PyPDF4.utils import b_
 from pkg_resources import resource_filename
 import os.path
 import mimetypes
@@ -287,7 +287,7 @@ def _prepare_pdf_metadata_xml(facturx_level, pdf_metadata):
     desc_adobe.set(ns_rdf + 'about', '')
     producer = etree.SubElement(
         desc_adobe, ns_pdf + 'Producer')
-    producer.text = 'PyPDF2'
+    producer.text = 'PyPDF4'
     desc_xmp = etree.SubElement(
         rdf, ns_rdf + 'Description', nsmap=nsmap_xmp)
     desc_xmp.set(ns_rdf + 'about', '')
diff --git a/requirement.txt b/requirement.txt
index 79b8b25..67bdef2 100644
--- a/requirement.txt
+++ b/requirement.txt
@@ -1,2 +1,2 @@
-PyPDF2
+PyPDF4
 lxml