diff --git a/a2a/weather_service/pyproject.toml b/a2a/weather_service/pyproject.toml
index 103736be..6bd667a9 100644
--- a/a2a/weather_service/pyproject.toml
+++ b/a2a/weather_service/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
     "cryptography>=48.0.0,<49", # Indirect; prevents CVE-2026-26007
     "langgraph-checkpoint>=4.2.0", # Indirect; prevents CVE-2025-64439
     "mcp>=1.28.1",              # Indirect; prevents CVE-2025-66416
-    "protobuf>=6.33.5",         # Indirect; prevents CVE-2026-0994
+    "protobuf>=7.36.2",         # Indirect; prevents CVE-2026-0994
     "starlette>=1.7.0",        # Indirect; prevents CVE-2025-62727
     "pyasn1>=0.6.4",            # Indirect; prevents CVE-2026-30922
     "aiohttp>=3.14.3",          # Indirect; prevents CVE-2025-69223
diff --git a/a2a/weather_service/uv.lock b/a2a/weather_service/uv.lock
index fe090753..d5aeebc9 100644
--- a/a2a/weather_service/uv.lock
+++ b/a2a/weather_service/uv.lock
@@ -2785,17 +2785,17 @@ wheels = [
 
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 ]
 
 [[package]]
@@ -3929,7 +3929,7 @@ requires-dist = [
     { name = "opentelemetry-exporter-otlp", specifier = ">=1.45.0" },
     { name = "opentelemetry-instrumentation-httpx", specifier = ">=0.49b0" },
     { name = "opentelemetry-instrumentation-openai", specifier = ">=0.62.3" },
-    { name = "protobuf", specifier = ">=6.33.5" },
+    { name = "protobuf", specifier = ">=7.36.2" },
     { name = "pyasn1", specifier = ">=0.6.4" },
     { name = "pydantic-settings", specifier = ">=2.15.0" },
     { name = "python-dotenv", specifier = ">=1.2.3" },