diff --git a/parm/jcb-gdas b/parm/jcb-gdas
index 390e3cac0..4e65dd7ef 160000
--- a/parm/jcb-gdas
+++ b/parm/jcb-gdas
@@ -1 +1 @@
-Subproject commit 390e3cac0b3f3c4aa2e14a7c2a7f41b05b6d5a3a
+Subproject commit 4e65dd7ef0ac3e599ce0bd1212ac9f20ccc6f877
diff --git a/parm/soca/letkf/letkf.yaml.j2 b/parm/soca/letkf/letkf.yaml.j2
index cd8613190..3988f74b2 100644
--- a/parm/soca/letkf/letkf.yaml.j2
+++ b/parm/soca/letkf/letkf.yaml.j2
@@ -34,6 +34,7 @@ driver:
 
 local ensemble DA:
   solver: Deterministic LETKF
+  use linear observer: true
   inflation:
     rtps: 0.5
     rtpp: 0.6