diff --git a/language/types.py b/language/types.py
index d8dc22d..5e4b033 100644
--- a/language/types.py
+++ b/language/types.py
@@ -2,6 +2,7 @@ import inspect
 import random
 from collections import defaultdict
 from typing import Union
+from random_sets.sets import WeightedSet, equal_weights
 
 
 class LanguageError(Exception):
@@ -17,35 +18,6 @@ class ImprobableTemplateError(Exception):
     """
 
 
-class WeightedSet:
-    """
-    A set in which members each have a weight, used for selecting at random.
-
-    Usage:
-        >>> ws = WeightedSet(('foo', 1.0), ('bar', 0.5))
-        >>> ws.random()
-        ('foo', 1.0)
-    """
-
-    def __init__(self, *weighted_members: tuple):
-        self.members = []
-        self.weights = []
-        if weighted_members:
-            self.members, self.weights = list(zip(*weighted_members))
-
-    def random(self) -> str:
-        return random.choices(self.members, self.weights)[0]
-
-    def __add__(self, obj):
-        ws = WeightedSet()
-        ws.members = self.members + obj.members
-        ws.weights = self.weights + obj.weights
-        return ws
-
-    def __str__(self):
-        return f"{self.members}\n{self.weights}"
-
-
 class Syllable:
     """
     One syllable of a word. Used to populate a SyllableSet.
@@ -402,9 +374,3 @@ class NameGenerator:
     def __str__(self) -> str:
         return self.name()[0]["fullname"]
 
-
-def equal_weights(terms: list, weight: float = 1.0, blank: bool = True) -> WeightedSet:
-    ws = WeightedSet(*[(term, weight) for term in terms])
-    if blank:
-        ws = WeightedSet(("", 1.0)) + ws
-    return ws
diff --git a/pyproject.toml b/pyproject.toml
index a2c2f33..3419662 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,6 +13,7 @@ python = "^3.10"
 rich = "^13.7.0"
 typer = "^0.9.0"
 dice = "^4.0.0"
+random_sets = { git = "https://github.com/evilchili/random-sets", branch="main" }
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.4.3"