diff --git a/CHANGELOG.md b/CHANGELOG.md
index 693f328..e0c8a3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [2.2.1] - 2024-05-29
+
+### Fixed
+- Fixed mypyc wheels failing to generate a tree for a non-empty enum ([#36])
+
+[#36]: https://github.com/trag1c/crossandra/issues/36
+
 ## [2.2.0] - 2024-05-29
 
 ### Added
@@ -135,3 +142,4 @@ Initial release 🎉
 [2.0.0]: https://github.com/trag1c/crossandra/compare/1.3.0...2.0.0
 [2.1.0]: https://github.com/trag1c/crossandra/compare/2.0.0...2.1.0
 [2.2.0]: https://github.com/trag1c/crossandra/compare/2.1.0...2.2.0
+[2.2.1]: https://github.com/trag1c/crossandra/compare/2.2.0...2.2.1
diff --git a/crossandra/lib.py b/crossandra/lib.py
index 79a55c0..cda3501 100644
--- a/crossandra/lib.py
+++ b/crossandra/lib.py
@@ -37,7 +37,8 @@ def generate_tree(inp: Iterable[tuple[str, Enum]]) -> Tree:
         curr = result
         for c in k[:-1]:
             curr = cast(Tree, curr.setdefault(c, {}))
-        if dct := cast(Tree, curr.get(k[-1])):
+        if dct := curr.get(k[-1]):
+            assert isinstance(dct, dict)  # noqa: S101  (needed for mypyc)
             dct[""] = v
         else:
             curr[k[-1]] = v
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 831c606..d5da5d0 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,4 +1,4 @@
-mypy ~= 1.10.0
+mypy[mypyc] ~= 1.10.0
 pytest ~= 8.2.0
 pytest-cov ~= 5.0.0
 ruff ~= 0.4.2
diff --git a/justfile b/justfile
index 073e0b0..f5f8dc5 100644
--- a/justfile
+++ b/justfile
@@ -2,10 +2,18 @@
 default:
     @just --list
 
+# Builds mypyc wheels locally
+build:
+    uv pip uninstall crossandra 2> /dev/null
+    rm -rf build
+    python setup.py install
+
+# Installs the project
 install:
     uv venv
     uv pip install . -r dev-requirements.txt
 
+# Runs pytest, mypy, ruff
 check:
     python -m pytest --cov crossandra --cov-report term-missing
     mypy --strict crossandra tests
diff --git a/pyproject.toml b/pyproject.toml
index 1bf7031..ba6d12e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "crossandra"
-version = "2.2.0"
+version = "2.2.1"
 description = "A fast and simple enum/regex-based tokenizer with decent configurability"
 authors = [{ email = "trag1c <trag1cdev@yahoo.com>" }]
 license = { text = "MIT" }