diff --git a/easystacks/software.eessi.io/2023.06/zen4/eessi-2023.06-eb-4.9.1-2023a.yml b/easystacks/software.eessi.io/2023.06/zen4/eessi-2023.06-eb-4.9.1-2023a.yml
index b3afe2b368..a529746676 100644
--- a/easystacks/software.eessi.io/2023.06/zen4/eessi-2023.06-eb-4.9.1-2023a.yml
+++ b/easystacks/software.eessi.io/2023.06/zen4/eessi-2023.06-eb-4.9.1-2023a.yml
@@ -1,3 +1,4 @@
 easyconfigs:
   - foss-2023a.eb
   - SciPy-bundle-2023.07-gfbf-2023a.eb
+  - ESPResSo-4.2.1-foss-2023a.eb