diff --git a/easystacks/software.eessi.io/2026.06/eessi-2026.06-eb-5.4.0-2026.1.yml b/easystacks/software.eessi.io/2026.06/eessi-2026.06-eb-5.4.0-2026.1.yml
index cd4a3467ad..be6353b4fc 100644
--- a/easystacks/software.eessi.io/2026.06/eessi-2026.06-eb-5.4.0-2026.1.yml
+++ b/easystacks/software.eessi.io/2026.06/eessi-2026.06-eb-5.4.0-2026.1.yml
@@ -16,3 +16,4 @@ easyconfigs:
   - hypothesis-6.153.2-GCCcore-15.2.0.eb
   - pybind11-3.0.4-GCCcore-15.2.0.eb
   - meson-python-0.19.0-GCCcore-15.2.0.eb
+  - LLVM-21.1.8-GCCcore-15.2.0.eb