diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7326e7f3525..dcd0a0bef55 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,8 +3,8 @@ project(openmc C CXX)
 
 # Set version numbers
 set(OPENMC_VERSION_MAJOR 0)
-set(OPENMC_VERSION_MINOR 13)
-set(OPENMC_VERSION_RELEASE 0)
+set(OPENMC_VERSION_MINOR 12)
+set(OPENMC_VERSION_RELEASE 2)
 set(OPENMC_VERSION ${OPENMC_VERSION_MAJOR}.${OPENMC_VERSION_MINOR}.${OPENMC_VERSION_RELEASE})
 configure_file(include/openmc/version.h.in "${CMAKE_BINARY_DIR}/include/openmc/version.h" @ONLY)
 
diff --git a/docs/source/conf.py b/docs/source/conf.py
index ed790a2e27f..55cfef35218 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -70,9 +70,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = "0.13"
+version = "0.12"
 # The full version, including alpha/beta/rc tags.
-release = "0.13.0-dev"
+release = "0.12.2"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/docs/source/releasenotes/0.12.2.rst b/docs/source/releasenotes/0.12.2.rst
new file mode 100644
index 00000000000..9dce6e89129
--- /dev/null
+++ b/docs/source/releasenotes/0.12.2.rst
@@ -0,0 +1,57 @@
+====================
+What's New in 0.12.2
+====================
+
+.. currentmodule:: openmc
+
+-------
+Summary
+-------
+
+This release of OpenMC is primarily a hotfix release with numerous important bug
+fixes. Several tally-related enhancements have also been added.
+
+------------
+New Features
+------------
+
+Three tally-related enhancements were added to the code in this release:
+
+- A new :class:`~openmc.CollisionFilter` class that allows tallies to be filtered
+  by the number of collisions a particle has undergone.
+- A `translation` attribute has been added to :class:`~openmc.MeshFilter` that
+  allows a mesh to be translated from its original position before location
+  checks are performed.
+- The :class:`~openmc.UnstructuredMesh` class now supports libMesh unstructured
+  meshes to enable better ingration with MOOSE-based applications.
+
+---------
+Bug Fixes
+---------
+
+- `Reset particle coordinates during find cell operation <https://github.com/openmc-dev/openmc/pull/1809>`_
+- `Cover quadric edge case <https://github.com/openmc-dev/openmc/pull/1812>`_
+- `Prevent divide-by-zero in bins_crossed methods for meshes <https://github.com/openmc-dev/openmc/pull/1816>`_
+- `Fix for translational periodic boundary conditions <https://github.com/openmc-dev/openmc/pull/1820>`_
+- `Fix angle sampling in CorrelatedAngleEnergy <https://github.com/openmc-dev/openmc/pull/1821>`_
+- `Fix typo in fmt string for a lattice error <https://github.com/openmc-dev/openmc/pull/1824>`_
+- `Nu-fission tally and stochastic volume bug fixes <https://github.com/openmc-dev/openmc/pull/1828>`_
+- `Make sure failed neighbor list triggers exhaustic search <https://github.com/openmc-dev/openmc/pull/1830>`_
+- `Change element to element.title to catch lowercase entries <https://github.com/openmc-dev/openmc/pull/1839>`_
+- `Disallow non-current scores with a surface filter <https://github.com/openmc-dev/openmc/pull/1844>`_
+- `Depletion operator obeys Materials.cross_sections <https://github.com/openmc-dev/openmc/pull/1846>`_
+- `Fix for surface_bins_crossed override <https://github.com/openmc-dev/openmc/pull/1847>`_
+
+------------
+Contributors
+------------
+
+This release contains new contributions from the following people:
+
+- `Hunter Belanger <https://github.com/HunterBelanger>`_
+- `Isaac Griswold-Steiner <https://github.com/isaac-gs>`_
+- `Andrew Johnson <https://github.com/drewejohnson>`_
+- `Gavin Ridley <https://github.com/gridley>`_
+- `Paul Romano <https://github.com/paulromano>`_
+- `Patrick Shriwise <https://github.com/pshriwise>`_
+- `Jonathan Shimwell <https://github.com/Shimwell>`_
diff --git a/docs/source/releasenotes/index.rst b/docs/source/releasenotes/index.rst
index 61bac06f17d..f3c02f0396c 100644
--- a/docs/source/releasenotes/index.rst
+++ b/docs/source/releasenotes/index.rst
@@ -7,6 +7,7 @@ Release Notes
 .. toctree::
   :maxdepth: 1
 
+  0.12.2
   0.12.1
   0.12.0
   0.11.0
diff --git a/include/openmc/version.h.in b/include/openmc/version.h.in
index 995f20c3b18..fe282be7c01 100644
--- a/include/openmc/version.h.in
+++ b/include/openmc/version.h.in
@@ -6,7 +6,7 @@ namespace openmc {
 constexpr int VERSION_MAJOR {@OPENMC_VERSION_MAJOR@};
 constexpr int VERSION_MINOR {@OPENMC_VERSION_MINOR@};
 constexpr int VERSION_RELEASE {@OPENMC_VERSION_RELEASE@};
-constexpr bool VERSION_DEV {true};
+constexpr bool VERSION_DEV {false};
 constexpr std::array<int, 3> VERSION {VERSION_MAJOR, VERSION_MINOR, VERSION_RELEASE};
 
 }
diff --git a/openmc/__init__.py b/openmc/__init__.py
index 50246cdd8a2..bd27ab308ed 100644
--- a/openmc/__init__.py
+++ b/openmc/__init__.py
@@ -34,4 +34,4 @@
 # Import a few convencience functions that used to be here
 from openmc.model import rectangular_prism, hexagonal_prism
 
-__version__ = '0.13.0-dev'
+__version__ = '0.12.2'
diff --git a/openmc/filter.py b/openmc/filter.py
index 8da3cf78f65..e0cedd6bf24 100644
--- a/openmc/filter.py
+++ b/openmc/filter.py
@@ -993,6 +993,8 @@ def get_pandas_dataframe(self, data_size, stride, **kwargs):
 class CollisionFilter(Filter):
     """Bins tally events based on the number of collisions.
 
+    .. versionadded:: 0.12.2
+
     Parameters
     ----------
     bins : Iterable of int
diff --git a/openmc/mesh.py b/openmc/mesh.py
index 16e25cddc47..7ef18b1ceb9 100644
--- a/openmc/mesh.py
+++ b/openmc/mesh.py
@@ -605,6 +605,9 @@ class UnstructuredMesh(MeshBase):
 
     .. versionadded:: 0.12
 
+    .. versionchanged:: 0.12.2
+        Support for libMesh unstructured meshes was added.
+
     Parameters
     ----------
     filename : str