diff --git a/Pipfile b/Pipfile
index a622686a..4a9b5c4c 100644
--- a/Pipfile
+++ b/Pipfile
@@ -22,5 +22,5 @@ pydantic = "==2.*"
 "ga4gh.vrs" = {version = "==2.0.0a13", extras = ["extras"]}
 gene-normalizer = "~=0.6.0"
 boto3 = "*"
-cool-seq-tool = "~=0.6.0"
+cool-seq-tool = "~=0.9.1"
 bioutils = "*"