diff --git a/pyproject.toml b/pyproject.toml
index 3d6c2b99d..ee6ac830f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ dependencies = [
     "validators<=0.20.0",
     "xmltodict",
     "tenacity",
-    "dateutils",
+    "dateutil",
 ]
 
 [project.optional-dependencies]
@@ -144,8 +144,8 @@ optional_dependencies = ["tests"] # to load extras from [project.optional-depend
 # MIT license: https://pypi.org/project/ordereddict/1.1/
 ordereddict = "1.1"
 
-# MIT license: https://pypi.org/project/pendulum/1.4.4/
-pendulum = ">=1.4.4"
+# MIT License: https://pypi.org/project/pendulum/3.0.0/
+pendulum = ">=3.0.0"
 
 # Python Imaging Library (PIL) License: https://github.com/python-pillow/Pillow/blob/master/LICENSE
 Pillow = ">=7.2.0"