diff --git a/a2a/weather_service/pyproject.toml b/a2a/weather_service/pyproject.toml
index 5ba0bad4..9c9a6a4b 100644
--- a/a2a/weather_service/pyproject.toml
+++ b/a2a/weather_service/pyproject.toml
@@ -10,11 +10,11 @@ license = { text = "Apache" }
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 dependencies = [
     "a2a-sdk>=1.1.0,<2",
-    "langgraph>=1.2.7",
-    "langchain-core>=1.4.0",
+    "langgraph>=1.2.9",
+    "langchain-core>=1.4.9",
     "langchain-community>=0.4.2",
     "langchain-ollama>=1.1.0",
-    "langchain-openai>=1.3.3",
+    "langchain-openai>=1.3.5",
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@@ -35,11 +35,11 @@ dependencies = [
     "mcp>=1.28.1",              # Indirect; prevents CVE-2025-66416
     "protobuf>=6.33.5",         # Indirect; prevents CVE-2026-0994
     "starlette>=1.3.1",        # Indirect; prevents CVE-2025-62727
-    "pyasn1>=0.6.3",            # Indirect; prevents CVE-2026-30922
+    "pyasn1>=0.6.4",            # Indirect; prevents CVE-2026-30922
     "aiohttp>=3.14.1",          # Indirect; prevents CVE-2025-69223
-    "gitpython>=3.1.47",        # Indirect; prevents CVE-2026-42215, CVE-2026-42284
+    "gitpython>=3.1.51",        # Indirect; prevents CVE-2026-42215, CVE-2026-42284
     "langchain-text-splitters>=1.1.2", # Indirect; prevents CVE-2026-41481
-    "langsmith>=0.9.5",        # Indirect; prevents CVE-2026-41182
+    "langsmith>=0.10.3",        # Indirect; prevents CVE-2026-41182
     "langchain-classic>=1.0.8", # Indirect; prevents CVE-2026-45134
     "mako>=1.3.12",             # Indirect; prevents CVE-2026-41205
     "marshmallow>=4.3.0",      # Indirect; prevents CVE-2025-68480
diff --git a/a2a/weather_service/uv.lock b/a2a/weather_service/uv.lock
index 421467a0..1e0277a6 100644
--- a/a2a/weather_service/uv.lock
+++ b/a2a/weather_service/uv.lock
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@@ -3830,17 +3830,17 @@ requires-dist = [
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     { name = "langchain-community", specifier = ">=0.4.2" },
-    { name = "langchain-core", specifier = ">=1.4.0" },
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