diff --git a/pyproject.toml b/pyproject.toml
index 276caf5..a520aea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ uvicorn = "^0.29.0"
 httptools = "^0.6.1"
 uvloop = "^0.19.0"
 transformers = "^4.39.3"
-ctranslate2 = "^4.1.0"
+ctranslate2 = "4.1.0"
 supervisor = "^4.2.5"
 
 [tool.poetry.group.dev.dependencies]