diff --git a/modules/account_invoice_watermark/account.py b/modules/account_invoice_watermark/account.py
index 0fb4a470ad..6c7bb5b397 100644
--- a/modules/account_invoice_watermark/account.py
+++ b/modules/account_invoice_watermark/account.py
@@ -2,10 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 from io import BytesIO
 
-try:
-    from PyPDF2 import PdfReader, PdfWriter
-except ImportError:
-    from PyPDF2 import PdfFileReader as PdfReader, PdfFileWriter as PdfWriter
+from pypdf import PdfReader, PdfWriter
 
 from trytond.pool import Pool, PoolMeta
 from trytond.report import Report
@@ -51,20 +48,11 @@ class Invoice(metaclass=PoolMeta):
         output = PdfWriter()
         invoice = PdfReader(BytesIO(invoice))
         watermark = PdfReader(BytesIO(watermark))
-        if hasattr(watermark, 'pages'):
-            watermark = watermark.pages[0]
-        else:
-            watermark = watermark.getNumPages(0)
+        watermark = watermark.pages[0]
         for i in range(len(invoice.pages)):
             page = invoice.pages[i]
-            if hasattr(page, 'merge_page'):
-                page.merge_page(watermark)
-            else:
-                page.mergePage(watermark)
-            if hasattr(output, 'add_page'):
-                output.add_page(page)
-            else:
-                output.addPage(page)
+            page.merge_page(watermark)
+            output.add_page(page)
         data = BytesIO()
         output.write(data)
         return data.getvalue()
diff --git a/modules/account_invoice_watermark/setup.py b/modules/account_invoice_watermark/setup.py
index 70cccc87e0..beadfa1b3d 100755
--- a/modules/account_invoice_watermark/setup.py
+++ b/modules/account_invoice_watermark/setup.py
@@ -44,7 +44,7 @@ else:
     download_url = 'http://downloads.tryton.org/%s.%s/' % (
         major_version, minor_version)
 
-requires = ['PyPDF2']
+requires = ['pypdf >= 3']
 for dep in info.get('depends', []):
     if not re.match(r'(ir|res)(\W|$)', dep):
         requires.append(get_require_version('trytond_%s' % dep))
diff --git a/modules/stock_package_shipping_dpd/setup.py b/modules/stock_package_shipping_dpd/setup.py
index 1d582a35cc..fa347580cf 100755
--- a/modules/stock_package_shipping_dpd/setup.py
+++ b/modules/stock_package_shipping_dpd/setup.py
@@ -41,7 +41,7 @@ else:
     download_url = 'http://downloads.tryton.org/%s.%s/' % (
         major_version, minor_version)
 
-requires = ['zeep >= 0.12', 'PyPDF2', 'lxml']
+requires = ['zeep >= 0.12', 'pypdf >= 3', 'lxml']
 for dep in info.get('depends', []):
     if not re.match(r'(ir|res)(\W|$)', dep):
         requires.append(get_require_version('trytond_%s' % dep))
diff --git a/modules/stock_package_shipping_dpd/stock.py b/modules/stock_package_shipping_dpd/stock.py
index 243e9d4041..eee3fc609a 100644
--- a/modules/stock_package_shipping_dpd/stock.py
+++ b/modules/stock_package_shipping_dpd/stock.py
@@ -6,13 +6,9 @@ from io import BytesIO
 from itertools import zip_longest
 
 from lxml import etree
+from pypdf import PdfReader, PdfWriter
 from zeep.exceptions import Fault
 
-try:
-    from PyPDF2 import PdfReader, PdfWriter
-except ImportError:
-    from PyPDF2 import PdfFileReader as PdfReader, PdfFileWriter as PdfWriter
-
 from trytond.i18n import gettext
 from trytond.model import fields
 from trytond.model.exceptions import AccessError
@@ -186,10 +182,7 @@ class CreateDPDShipping(Wizard):
         for page in iter_pdf_pages(reader):
             new_pdf = PdfWriter()
             new_label = BytesIO()
-            if hasattr(new_pdf, 'add_page'):
-                new_pdf.add_page(page)
-            else:
-                new_pdf.addPage(page)
+            new_pdf.add_page(page)
             new_pdf.write(new_label)
             labels.append(new_label)
 
diff --git a/modules/stock_package_shipping_mygls/setup.py b/modules/stock_package_shipping_mygls/setup.py
index df941a729b..00df26d6fb 100755
--- a/modules/stock_package_shipping_mygls/setup.py
+++ b/modules/stock_package_shipping_mygls/setup.py
@@ -44,7 +44,7 @@ else:
     download_url = 'http://downloads.tryton.org/%s.%s/' % (
         major_version, minor_version)
 
-requires = ['zeep', 'PyPDF2']
+requires = ['zeep', 'pypdf >= 3']
 for dep in info.get('depends', []):
     if not re.match(r'(ir|res)(\W|$)', dep):
         requires.append(get_require_version('trytond_%s' % dep))
diff --git a/modules/stock_package_shipping_mygls/stock.py b/modules/stock_package_shipping_mygls/stock.py
index 91cd47f624..17fd4e85f4 100644
--- a/modules/stock_package_shipping_mygls/stock.py
+++ b/modules/stock_package_shipping_mygls/stock.py
@@ -3,10 +3,7 @@
 from io import BytesIO
 from itertools import zip_longest
 
-try:
-    from PyPDF2 import PdfReader, PdfWriter
-except ImportError:
-    from PyPDF2 import PdfFileReader as PdfReader, PdfFileWriter as PdfWriter
+from pypdf import PdfReader, PdfWriter
 
 from trytond.i18n import gettext
 from trytond.model import fields
@@ -183,10 +180,7 @@ class ShipmentCreateShippingMyGLS(Wizard):
         for i, page in enumerate(iter_pdf_pages(reader)):
             pdf = PdfWriter()
             label = BytesIO()
-            if hasattr(pdf, 'add_page'):
-                pdf.add_page(page)
-            else:
-                pdf.addPage(page)
+            pdf.add_page(page)
             pdf.write(label)
             if carrier.mygls_type_of_printer in {'A4_2x2', 'A4_4x1'}:
                 if carrier.mygls_type_of_printer == 'A4_2x2':