diff --git a/a2a/weather_service/pyproject.toml b/a2a/weather_service/pyproject.toml
index d75554f2..a747aaf0 100644
--- a/a2a/weather_service/pyproject.toml
+++ b/a2a/weather_service/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "openinference-semantic-conventions>=0.1.12",
     "openinference-instrumentation-langchain>=0.1.27",
     "urllib3>=2.6.3",   # Indirect; prevents CVE-2025-66418
-    "python-multipart>=0.0.22", # Indirect; prevents CVE-2026-24486
+    "python-multipart>=0.0.26", # Indirect; prevents CVE-2026-24486
     "cryptography>=46.0.5",     # Indirect; prevents CVE-2026-26007
     "langgraph-checkpoint>=3.0.0", # Indirect; prevents CVE-2025-64439
     "mcp>=1.23.0",              # Indirect; prevents CVE-2025-66416