diff --git a/packages/build-brainscales/package.py b/packages/build-brainscales/package.py
index 9d78d8ce5fa697bca49ad3fc7aeacedae7c13299..f679dab01f08970d39655fc789fd9466353318fe 100644
--- a/packages/build-brainscales/package.py
+++ b/packages/build-brainscales/package.py
@@ -66,7 +66,7 @@ class BuildBrainscales(WafPackage):
     )
 
     # common dependencies of BuildBrainscales-derived packages
-    depends_on('oppulance@10.0-a1', when='@10.0-a1', type=('build', 'link', 'run', 'test'))
+    depends_on('oppulance@9.0-a9', when='@10.0-a1', type=('build', 'link', 'run', 'test')) # keep the old one for now
     depends_on('oppulance@9.0-a9', when='@9.0-a9', type=('build', 'link', 'run', 'test'))
     depends_on('oppulance@9.0-a8', when='@9.0-a8', type=('build', 'link', 'run', 'test'))
     depends_on('oppulance@9.0-a7', when='@9.0-a7', type=('build', 'link', 'run', 'test'))