diff --git a/pyproject.toml b/pyproject.toml
index 7fd4228..e3f94c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ python = ">=3.9,<4.0"
 torch = { version = ">=1.13.1", optional = true }
 transformers = { version = ">=4.26.1", optional = true }
 sentence-transformers = { version = ">=2.0.0", optional = true }
-mmh3 = "^4.1.0"
+mmh3 = ">=4.1.0,<6.0.0"
 nltk = "^3.9.1"
 openai =  { version = "^1.2.3", optional = true }
 cohere = { version = "^4.37", optional = true }