diff --git a/libs/core/langchain_core/runnables/graph_mermaid.py b/libs/core/langchain_core/runnables/graph_mermaid.py
index 410c6c56652c8..9f09718aea4b1 100644
--- a/libs/core/langchain_core/runnables/graph_mermaid.py
+++ b/libs/core/langchain_core/runnables/graph_mermaid.py
@@ -239,7 +239,8 @@ def add_subgraph(edges: list[Edge], prefix: str) -> None:
 
 def _escape_node_label(node_label: str) -> str:
     """Escapes the node label for Mermaid syntax."""
-    return re.sub(r"[^a-zA-Z-_0-9]", "_", node_label)
+    mermaid_special_chars = r"[\(\)\[\]\{\}<>\"'`;:&|,=#`~^%?@$/+\-\*!\.\\]"
+    return re.sub(mermaid_special_chars, "_", node_label)
 
 
 def _generate_mermaid_graph_styles(node_colors: NodeStyles) -> str: