diff --git a/SalishSeaTools/envs/requirements.txt b/SalishSeaTools/envs/requirements.txt
index 75ccd891..ca1ed174 100644
--- a/SalishSeaTools/envs/requirements.txt
+++ b/SalishSeaTools/envs/requirements.txt
@@ -105,7 +105,7 @@ MarkupSafe==3.0.3
 matplotlib==3.10.8
 matplotlib-inline==0.2.1
 mdurl==0.1.2
-mistune==3.2.0
+mistune==3.2.1
 more-itertools==10.8.0
 munkres==1.1.4
 mypy_extensions==1.1.0