diff --git a/env/merlin/sysconfigs/compilers.yaml b/env/merlin/sysconfigs/compilers.yaml
index 0b8e0dc..34a145c 100644
--- a/env/merlin/sysconfigs/compilers.yaml
+++ b/env/merlin/sysconfigs/compilers.yaml
@@ -1,18 +1,5 @@
 ---
 compilers:
-  - compiler:
-      environment: {}
-      extra_rpaths: []
-      flags: {}
-      modules: []
-      operating_system: rhel7
-      paths:
-        cc: /usr/bin/gcc
-        cxx: /usr/bin/g++
-        f77: /usr/bin/gfortran
-        fc: /usr/bin/gfortran
-      spec: gcc@4.8.5
-      target: x86_64
   - compiler:
       environment: {}
       extra_rpaths: []
@@ -26,19 +13,6 @@ compilers:
         fc: /opt/psi/Programming/intel/22.2/compiler/2022.1.0/linux/bin/ifx
       spec: dpcpp@2022.1.0
       target: x86_64
-  - compiler:
-      environment: {}
-      extra_rpaths: []
-      flags: {}
-      modules: []
-      operating_system: rhel7
-      paths:
-        cc: /opt/psi/Programming/gcc/9.3.0/bin/gcc
-        cxx: /opt/psi/Programming/gcc/9.3.0/bin/g++
-        f77: /opt/psi/Programming/gcc/9.3.0/bin/gfortran
-        fc: /opt/psi/Programming/gcc/9.3.0/bin/gfortran
-      spec: gcc@9.3.0
-      target: x86_64
   - compiler:
       environment: {}
       extra_rpaths: []
@@ -72,11 +46,24 @@ compilers:
       modules: []
       operating_system: rhel7
       paths:
-        cc: /opt/psi/Programming/gcc/9.5.0/bin/gcc
-        cxx: /opt/psi/Programming/gcc/9.5.0/bin/g++
-        f77: /opt/psi/Programming/gcc/9.5.0/bin/gfortran
-        fc: /opt/psi/Programming/gcc/9.5.0/bin/gfortran
-      spec: gcc@9.5.0
+        cc: /opt/psi/Programming/gcc/12.1.0/bin/gcc
+        cxx: /opt/psi/Programming/gcc/12.1.0/bin/g++
+        f77: /opt/psi/Programming/gcc/12.1.0/bin/gfortran
+        fc: /opt/psi/Programming/gcc/12.1.0/bin/gfortran
+      spec: gcc@12.1.0
+      target: x86_64
+  - compiler:
+      environment: {}
+      extra_rpaths: []
+      flags: {}
+      modules: []
+      operating_system: rhel7
+      paths:
+        cc: /opt/psi/Programming/clang/12.0.0_rhel7/bin/clang
+        cxx: /opt/psi/Programming/clang/12.0.0_rhel7/bin/clang++
+        f77: null
+        fc: null
+      spec: clang@12.0.0
       target: x86_64
   - compiler:
       environment: {}