diff --git a/phases/nonlinear-static-newton-raphson/index.json b/phases/nonlinear-static-newton-raphson/index.json
index ba919b7..79a8b29 100644
--- a/phases/nonlinear-static-newton-raphson/index.json
+++ b/phases/nonlinear-static-newton-raphson/index.json
@@ -53,7 +53,10 @@
     {
       "step": 6,
       "name": "backend-neutral-tangent-solver",
-      "status": "pending"
+      "status": "completed",
+      "started_at": "2026-08-24T14:13:14+0900",
+      "summary": "Added an unsymmetric full-CSR PARDISO tangent solver with fail-closed pivot handling and regression coverage while preserving SPD solver behavior.",
+      "completed_at": "2026-08-24T14:25:05+0900"
     },
     {
       "step": 7,