diff --git a/stacks/pinot-noir/definitions_stack.yaml b/stacks/pinot-noir/definitions_stack.yaml
index cc2b10249a71daf3701e9222a4c790b1245002cb..6d69d76f98c8e02355c2cfe4b0315a9e29aceb38 100644
--- a/stacks/pinot-noir/definitions_stack.yaml
+++ b/stacks/pinot-noir/definitions_stack.yaml
@@ -287,6 +287,7 @@ definitions:
       - ansys@2025R1
       - cfdplusplus
       - comsol
+      - comsol@6.3
       - fdtd
       - fdtd@2024-R2.3-3941
       - gaussian
diff --git a/stacks/pinot-noir/packages_stack.yaml b/stacks/pinot-noir/packages_stack.yaml
index e7e2c51ec4e8be9100590d1e132c5e7a944d3165..2d0a95256af4cf0a2c237a8c05238e7635f83f0e 100644
--- a/stacks/pinot-noir/packages_stack.yaml
+++ b/stacks/pinot-noir/packages_stack.yaml
@@ -475,6 +475,7 @@ packages:
     - {spec: comsol@5.6, prefix: /ssoft/spack/external/comsol/5.6/comsol56/multiphysics/}
     - {spec: comsol@6.0, prefix: /ssoft/spack/external/comsol/6.0}
     - {spec: comsol@6.2, prefix: /ssoft/spack/external/comsol/6.2}
+    - {spec: comsol@6.3, prefix: /ssoft/spack/external/comsol/6.3}
   fdtd:
     buildable: false
     permissions: {read: group, group: ansys-soft}