diff --git a/odoo/addons/base/models/ir_actions_report.py b/odoo/addons/base/models/ir_actions_report.py
index 296cbd508e2..327d75dfcbe 100644
--- a/odoo/addons/base/models/ir_actions_report.py
+++ b/odoo/addons/base/models/ir_actions_report.py
@@ -22,13 +22,17 @@ import json
 from lxml import etree
 from contextlib import closing
 from reportlab.graphics.barcode import createBarcodeDrawing
-from PyPDF2 import PdfFileWriter, PdfFileReader, utils
+from PyPDF2 import PdfFileWriter, PdfFileReader
 from collections import OrderedDict
 from collections.abc import Iterable
 from PIL import Image, ImageFile
 # Allow truncated images
 ImageFile.LOAD_TRUNCATED_IMAGES = True
 
+try:
+    from PyPDF2.errors import PdfReadError
+except ImportError:
+    from PyPDF2.utils import PdfReadError
 
 _logger = logging.getLogger(__name__)
 
@@ -615,7 +619,7 @@ class IrActionsReport(models.Model):
             try:
                 reader = PdfFileReader(stream)
                 writer.appendPagesFromReader(reader)
-            except utils.PdfReadError:
+            except PdfReadError:
                 raise UserError(_("Odoo is unable to merge the generated PDFs."))
         result_stream = io.BytesIO()
         streams.append(result_stream)
diff --git a/odoo/addons/base/tests/minimal.pdf b/odoo/addons/base/tests/minimal.pdf
index 2a73de072da..ec69682def7 100644
Binary files a/odoo/addons/base/tests/minimal.pdf and b/odoo/addons/base/tests/minimal.pdf differ
diff --git a/odoo/tools/pdf.py b/odoo/tools/pdf.py
index 46fee2c6ed0..cdd2e359af7 100644
--- a/odoo/tools/pdf.py
+++ b/odoo/tools/pdf.py
@@ -6,8 +6,6 @@ import re
 from datetime import datetime
 from hashlib import md5
 from logging import getLogger
-from PyPDF2 import PdfFileWriter, PdfFileReader
-from PyPDF2.generic import DictionaryObject, NameObject, ArrayObject, DecodedStreamObject, NumberObject, createStringObject, ByteStringObject
 from zlib import compress, decompress
 from PIL import Image, PdfImagePlugin
 from reportlab.lib import colors
@@ -15,6 +13,28 @@ from reportlab.lib.units import cm
 from reportlab.lib.utils import ImageReader
 from reportlab.pdfgen import canvas
 
+try:
+    # class were renamed in PyPDF2 > 2.0
+    # https://pypdf2.readthedocs.io/en/latest/user/migration-1-to-2.html#classes
+    from PyPDF2 import PdfReader
+    import PyPDF2
+    # monkey patch to discard unused arguments as the old arguments were not discarded in the transitional class
+    # https://pypdf2.readthedocs.io/en/2.0.0/_modules/PyPDF2/_reader.html#PdfReader
+    class PdfFileReader(PdfReader):
+        def __init__(self, *args, **kwargs):
+            if "strict" not in kwargs and len(args) < 2:
+                kwargs["strict"] = True  # maintain the default
+            kwargs = {k:v for k, v in kwargs.items() if k in ('strict', 'stream')}
+            super().__init__(*args, **kwargs)
+
+    PyPDF2.PdfFileReader = PdfFileReader
+    from PyPDF2 import PdfFileWriter, PdfFileReader
+    PdfFileWriter._addObject = PdfFileWriter._add_object
+except ImportError:
+    from PyPDF2 import PdfFileWriter, PdfFileReader
+
+from PyPDF2.generic import DictionaryObject, NameObject, ArrayObject, DecodedStreamObject, NumberObject, createStringObject, ByteStringObject
+
 try:
     from fontTools.ttLib import TTFont
 except ImportError:
@@ -410,7 +430,7 @@ class OdooPdfFileWriter(PdfFileWriter):
                 DictionaryObject({
                     NameObject('/CheckSum'): createStringObject(md5(attachment['content']).hexdigest()),
                     NameObject('/ModDate'): createStringObject(datetime.now().strftime(DEFAULT_PDF_DATETIME_FORMAT)),
-                    NameObject('/Size'): NameObject(str(len(attachment['content']))),
+                    NameObject('/Size'): NameObject(f"/{len(attachment['content'])}"),
                 }),
         })
         if attachment.get('subtype'):