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-rw-r--r--polymatrix/statemonad.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/polymatrix/statemonad.py b/polymatrix/statemonad.py
index dc680de..bfd63de 100644
--- a/polymatrix/statemonad.py
+++ b/polymatrix/statemonad.py
@@ -17,7 +17,7 @@ U = TypeVar("U")
V = TypeVar("V")
-@dataclass
+@dataclass(frozen=True)
class StateMonad(Generic[State, U]):
apply_func: Callable[[State], tuple[State, U]]