diff --git a/stacks/pinot-noir/spack.yaml b/stacks/pinot-noir/spack.yaml
index ccb9068f280620df2181d13c2c9a41bad3c25c4b..a942feeaee402506139139ac3fce61c40a2fecc5 100644
--- a/stacks/pinot-noir/spack.yaml
+++ b/stacks/pinot-noir/spack.yaml
@@ -193,7 +193,7 @@ spack:
         - iq-tree
         - py-biopython
         - py-keras-preprocessing
-        - py-macs2
+        - py-macs3
         - py-matplotlib
         - py-numpy
         - py-opt-einsum