diff --git a/MPI/boost/files/variants.merlin6 b/MPI/boost/files/variants.merlin6
index 15aaa7ca352c0f24926acc8236e4e2bc234d9acf..4bf12e78fabbed8c94acf31a38651d00b1bb687a 100644
--- a/MPI/boost/files/variants.merlin6
+++ b/MPI/boost/files/variants.merlin6
@@ -1,3 +1,4 @@
-boost/1.70.0_slurm         unstable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/3.1.6_slurm b:zlib/1.2.11
-boost/1.73.0_slurm         unstable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/3.1.6_slurm b:zlib/1.2.11
+boost/1.70.0_slurm         stable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/3.1.6_slurm b:zlib/1.2.11
+boost/1.73.0_slurm         stable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/3.1.6_slurm b:zlib/1.2.11
+boost/1.73.0_slurm         unstable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/4.0.5_slurm b:zlib/1.2.11