diff --git a/pentestagent/interface/tui.py b/pentestagent/interface/tui.py
index 2840fea..7555a66 100644
--- a/pentestagent/interface/tui.py
+++ b/pentestagent/interface/tui.py
@@ -1794,7 +1794,12 @@ class PentestAgentTUI(App):
                     first = scroll.children[0] if scroll.children else None
                     msg = SystemMessage(f"  Target: {target}")
                     if first:
-                        scroll.mount_before(msg, first)
+                        # Textual's ScrollableContainer may not implement
+                        # mount_before across versions; fall back to mount.
+                        try:
+                            scroll.mount_before(msg, first)
+                        except Exception:
+                            scroll.mount(msg)
                     else:
                         scroll.mount(msg)
                 except Exception as e:
@@ -2419,7 +2424,10 @@ Be concise. Use the actual data from notes."""
                     first = scroll.children[0] if scroll.children else None
                     msg = SystemMessage(f"  Target: {target}")
                     if first:
-                        scroll.mount_before(msg, first)
+                        try:
+                            scroll.mount_before(msg, first)
+                        except Exception:
+                            scroll.mount(msg)
                     else:
                         scroll.mount(msg)
                 except Exception: