diff --git a/pyproject.toml b/pyproject.toml
index a401d53..a4d7539 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ pyyaml = "^6.0.1"
 numpy = "^1.25.2"
 requests = "^2.31.0"
 tqdm = "^4.66.1"
-portfolyo = "^0.5"
+portfolyo = "^0.5.8"
 
 [tool.poetry.group.dev.dependencies]
 python = "^3.9 <3.12"