diff --git a/source/isaaclab/config/extension.toml b/source/isaaclab/config/extension.toml
index 3086a2b93c88..fad2b53b6c5e 100644
--- a/source/isaaclab/config/extension.toml
+++ b/source/isaaclab/config/extension.toml
@@ -1,7 +1,7 @@
 [package]
 
 # Note: Semantic Versioning is used: https://semver.org/
-version = "4.6.12"
+version = "4.6.13"
 
 # Description
 title = "Isaac Lab framework for Robot Learning"
diff --git a/source/isaaclab/docs/CHANGELOG.rst b/source/isaaclab/docs/CHANGELOG.rst
index ce6db83354dd..ae5e175a22ce 100644
--- a/source/isaaclab/docs/CHANGELOG.rst
+++ b/source/isaaclab/docs/CHANGELOG.rst
@@ -1,6 +1,22 @@
 Changelog
 ---------
 
+4.6.13 (2026-04-24)
+~~~~~~~~~~~~~~~~~~~
+
+Fixed
+^^^^^
+
+* Fixed CI failures in Theia-based observation tests where ``from transformers import AutoModel``
+  raised ``ValueError: Unable to compare versions for packaging>=20.0: need=20.0 found=None``.
+  :mod:`isaaclab_rl` pins ``packaging<24``, which downgrades Isaac Sim's prebundled ``packaging``
+  26.0 to 23.2 in ``site-packages``. On some Isaac Sim develop images that uninstall/reinstall
+  leaves a ``dist-info`` whose ``METADATA`` is missing the ``Version:`` header, so
+  ``importlib.metadata.version("packaging")`` returns ``None`` at runtime. Added an explicit
+  ``pip install --force-reinstall --no-deps packaging`` step at the end of
+  :meth:`~isaaclab.cli.commands.install.command_install` to rewrite the ``dist-info`` cleanly.
+
+
 4.6.12 (2026-04-23)
 ~~~~~~~~~~~~~~~~~~~
 
diff --git a/source/isaaclab/isaaclab/cli/commands/install.py b/source/isaaclab/isaaclab/cli/commands/install.py
index 53cf4a799fb1..9f5b85ea0076 100644
--- a/source/isaaclab/isaaclab/cli/commands/install.py
+++ b/source/isaaclab/isaaclab/cli/commands/install.py
@@ -570,6 +570,15 @@ def command_install(install_type: str = "all") -> None:
         # Can prevent that from happening.
         _ensure_cuda_torch()
 
+        # Force-reinstall packaging so its METADATA is rewritten by pip.
+        # isaaclab_rl pins "packaging<24", which downgrades Isaac Sim's prebundled
+        # packaging 26.0 to 23.2 in site-packages. On some Isaac Sim develop images
+        # that uninstall/reinstall leaves a dist-info whose METADATA is missing the
+        # "Version:" header, and importlib.metadata.version("packaging") returns
+        # None — which breaks transformers' require_version("packaging>=20.0") at
+        # import time. Writing the dist-info one more time clears that state.
+        run_command(pip_cmd + ["install", "--force-reinstall", "--no-deps", "packaging>=20.0,<24"])
+
         # Repoint prebundled packages in Isaac Sim to the environment's copies so
         # the active venv/conda versions are always loaded regardless of PYTHONPATH
         # ordering (e.g. torch+cu130 in venv vs torch+cu128 in prebundle on aarch64).
diff --git a/source/isaaclab_tasks/test/env_test_utils.py b/source/isaaclab_tasks/test/env_test_utils.py
index 6de1c6acaa52..f152f8bab961 100644
--- a/source/isaaclab_tasks/test/env_test_utils.py
+++ b/source/isaaclab_tasks/test/env_test_utils.py
@@ -26,9 +26,7 @@
 # Map of task IDs to the reason for marking the corresponding parametrized
 # test cases as expected failures.  Tests that consume :func:`setup_environment`
 # automatically pick up these marks via :class:`pytest.param`.
-XFAIL_TASKS: dict[str, str] = {
-    "Isaac-Cartpole-RGB-TheiaTiny-v0": "TheiaTiny environment is currently broken; xfailed pending fix.",
-}
+XFAIL_TASKS: dict[str, str] = {}
 
 
 def _is_teleop_env(task_spec) -> bool: