diff --git a/eb_hooks.py b/eb_hooks.py
index 1ab72727..bf87c2a2 100644
--- a/eb_hooks.py
+++ b/eb_hooks.py
@@ -76,6 +76,11 @@
         {'name': 'lfoss', 'version': '2025b'}
     )
 
+if EASYBUILD_VERSION >= '5.3.0':
+    EESSI_SUPPORTED_TOP_LEVEL_TOOLCHAINS['2025.06'].append(
+        {'name': 'rfoss', 'version': '2025a'}
+    )
+
 # Supported compute capabilities by CUDA toolkit version
 # Obtained by installing all CUDAs from 12.0.0 to 13.1.0, then using: