diff --git a/kicad b/kicad
index c630090..fef0343 160000
--- a/kicad
+++ b/kicad
@@ -1 +1 @@
-Subproject commit c63009046c06011a0220b0e3ada28e084ffe4e54
+Subproject commit fef0343a97c0c8426128422924fbd5e065cbd1f3
diff --git a/wasm/stubs/model_substitution_stub.cpp b/wasm/stubs/model_substitution_stub.cpp
new file mode 100644
index 0000000..f51e22f
--- /dev/null
+++ b/wasm/stubs/model_substitution_stub.cpp
@@ -0,0 +1,37 @@
+/*
+ * MODEL_SUBSTITUTION stubs for the KiCad WASM build.
+ *
+ * When KICAD_BUILD_3D_VIEWER_WASM=OFF the 3D-viewer library is not linked, but
+ * it is where the .wrl→STEP model-substitution helpers
+ * (3d-viewer/3d_cache/model_substitution_helpers.cpp) live. pcbnew's
+ * dialog_migrate_3d_models.cpp still references them, so the final pcbnew/
+ * footprint_editor link fails with undefined MODEL_SUBSTITUTION symbols.
+ *
+ * These no-op stubs satisfy the linker. There is no 3D viewer in the browser
+ * build, so model migration simply finds no substitutions (the dialog reports
+ * nothing to migrate) — which is the correct behavior for a WASM build with no
+ * local 3D model filesystem.
+ */
+
+#include <3d_cache/model_substitution_helpers.h>
+
+namespace MODEL_SUBSTITUTION
+{
+
+bool IsWrlExtension( const wxString& )
+{
+    return false;
+}
+
+
+void STEP_CATALOG::Build( const wxString&, const FILENAME_RESOLVER* )
+{
+}
+
+
+wxString STEP_CATALOG::FindMatchFor( const wxString& ) const
+{
+    return wxEmptyString;
+}
+
+}  // namespace MODEL_SUBSTITUTION