diff --git a/pyproject.toml b/pyproject.toml
index 9f26863..1fddbe2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = [
         "scipy>=1.12",
         "pymatgen>=2024.9.10",
         "iapws>=1.5.3",
-        "monty>=2024.7.12",
+        "monty>=2024.7.29",
         "maggma>=0.67.0",
         "phreeqpython>=1.5.2",
     ]
diff --git a/src/pyEQL/solution.py b/src/pyEQL/solution.py
index 56b51ff..eac5968 100644
--- a/src/pyEQL/solution.py
+++ b/src/pyEQL/solution.py
@@ -2351,10 +2351,6 @@ def as_dict(self) -> dict:
         if self.volume_update_required:
             self._update_volume()
         d = super().as_dict()
-        for k, v in d.items():
-            # convert all Quantity to str
-            if isinstance(v, Quantity):
-                d[k] = str(v)
         # replace solutes with the current composition
         d["solutes"] = {k: f"{v} mol" for k, v in self.components.items()}
         # replace the engine with the associated str