diff --git a/requirements/CI/requirements.txt b/requirements/CI/requirements.txt
index 73597c751..a0f74a6e1 100644
--- a/requirements/CI/requirements.txt
+++ b/requirements/CI/requirements.txt
@@ -16,7 +16,7 @@ pyslim==1.0.4
 numpy==2.2.1
 scipy==1.14.1
 scikit-allel==1.3.13
-biopython==1.82
+biopython==1.84
 demes==0.2.2
 demesdraw==0.3.1
 kastore==0.3.3