diff --git a/rdfproxy/checks/checkers.py b/rdfproxy/checks/checkers.py
index b9ee080..3899a1b 100644
--- a/rdfproxy/checks/checkers.py
+++ b/rdfproxy/checks/checkers.py
@@ -8,13 +8,23 @@
     check_select_query,
     check_solution_modifiers,
 )
-from toolz import compose_left
 
 
 T = TypeVar("T")
 _TCheck = Callable[[T], T | NoReturn]
 
 
+def compose_left(*fns: Callable) -> Callable:
+    def _left_wrapper(*fns):
+        fn, *rest_fns = fns
+
+        if rest_fns:
+            return lambda *args, **kwargs: fn(_left_wrapper(*rest_fns)(*args, **kwargs))
+        return fn
+
+    return _left_wrapper(*reversed(fns))
+
+
 def compose_checker(*checkers: _TCheck) -> _TCheck:
     return compose_left(*checkers)