diff --git a/profiles/package.mask b/profiles/package.mask
index 60446f00f8f95..7fc5ab405ce44 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -33,6 +33,14 @@
 
 #--- END OF EXAMPLES ---
 
+# Sam James <sam@gentoo.org> (2023-03-29)
+# Regressions in solving ability affecting e.g. igraph:
+# https://github.com/opencollab/arpack-ng/issues/401
+# https://github.com/opencollab/arpack-ng/issues/410
+# https://github.com/opencollab/arpack-ng/issues/411
+# https://github.com/igraph/igraph/issues/2311
+=sci-libs/arpack-3.9.0
+
 # Michał Górny <mgorny@gentoo.org> (2023-03-28)
 # Unfetchable, the homepage is gone.  Last updated in 2020.
 # Removal on 2023-04-27.  Bug #831304.