diff --git a/pyproject.toml b/pyproject.toml
index 8f47d20..041f33d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ dev = [
     "ruff>=0.16.3,<1",     # linter + formatter
     "pytest>=9.1,<10",     # test runner
     "pyright>=1.1,<2",     # static type checker
-    "codespell>=2.4,<3",   # spell checker (code, comments, docs)
+    "codespell>=2.4.3,<3",   # spell checker (code, comments, docs)
 ]
 # Docs site toolchain (Sphinx + MyST + furo). Install with `uv pip install -e '.[docs]'`.
 # Pinned deliberately: chose Sphinx over MkDocs because the MkDocs ecosystem is