diff --git a/juju/__init__.py b/juju/__init__.py
index 9da2b17a..742d5ace 100644
--- a/juju/__init__.py
+++ b/juju/__init__.py
@@ -1,3 +1,7 @@
 # Copyright 2024 Canonical Ltd.
 # Licensed under the Apache V2, see LICENCE file for details.
 """Python Library for Juju."""
+
+from backports.datetime_fromisoformat import MonkeyPatch
+
+MonkeyPatch.patch_fromisoformat()
diff --git a/pyproject.toml b/pyproject.toml
index b3c2d427..7a761c9b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,6 @@ classifiers = [
 ]
 dependencies = [
     "macaroonbakery>=1.1,<2.0",
-    "pyRFC3339>=1.0,<2.0",
     "pyyaml>=5.1.2",
     "websockets>=13.0.1",
     "paramiko>=2.4.0",
@@ -35,6 +34,7 @@ dependencies = [
     "packaging",
     "typing-extensions>=4.5.0",
     'backports.strenum>=1.3.1; python_version < "3.11"',
+    "backports-datetime-fromisoformat>=2.0.2",
 ]
 [project.optional-dependencies]
 dev = [
diff --git a/tox.ini b/tox.ini
index d284673b..c9b8f975 100644
--- a/tox.ini
+++ b/tox.ini
@@ -50,6 +50,10 @@ commands =
 
 [testenv:unit]
 envdir = {toxworkdir}/py3
+deps =
+    backports-datetime-fromisoformat
+allowlist_externals =
+    pytest
 commands =
     pytest {toxinidir}/tests/unit {posargs}