diff --git a/pyproject.toml b/pyproject.toml
index f8e7603207..cf659a2ed4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ dependencies = [
     "asyncpg>=0.30.0",
     "pg8000>=1.31.0",  # Sync driver for Cloud SQL Connector in GitHub Actions
     "alembic>=1.14.0",
-    "cloud-sql-python-connector[asyncpg,pg8000]>=1.20.2",  # Cloud SQL Connector
+    "cloud-sql-python-connector[asyncpg,pg8000]>=1.20.3",  # Cloud SQL Connector
     # Data & Plotting
     "pandas>=3.0.3",
     "numpy>=2.4.6",
diff --git a/uv.lock b/uv.lock
index 3a865d0d60..93df9b174f 100644
--- a/uv.lock
+++ b/uv.lock
@@ -418,7 +418,7 @@ requires-dist = [
     { name = "cairosvg", marker = "extra == 'lib-pygal'", specifier = ">=2.7.0" },
     { name = "cairosvg", marker = "extra == 'plotting'", specifier = ">=2.7.0" },
     { name = "cartopy", marker = "extra == 'plotting'", specifier = ">=0.24.0" },
-    { name = "cloud-sql-python-connector", extras = ["asyncpg", "pg8000"], specifier = ">=1.20.2" },
+    { name = "cloud-sql-python-connector", extras = ["asyncpg", "pg8000"], specifier = ">=1.20.3" },
     { name = "fastapi", specifier = ">=0.136.3" },
     { name = "fastmcp", specifier = ">=3.3.1" },
     { name = "google-cloud-storage", specifier = ">=3.0.0" },
@@ -858,7 +858,7 @@ wheels = [
 
 [[package]]
 name = "cloud-sql-python-connector"
-version = "1.20.2"
+version = "1.20.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "aiofiles" },
@@ -868,9 +868,9 @@ dependencies = [
     { name = "google-auth" },
     { name = "requests" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/b3/35/b2145359b1d6e6a2447be27c5048dd23703ac7df7303f8bbb88f0cb5d793/cloud_sql_python_connector-1.20.2.tar.gz", hash = "sha256:c1a6d827199c9730e7f9687c074885ce7db447dd7d8f3f3a49c37180a530df95", size = 44245, upload-time = "2026-04-17T19:03:37.631Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/ad/87/3f424bab34980b7996514d5232134ef868e412a9dcde1ba20345d674f62f/cloud_sql_python_connector-1.20.3.tar.gz", hash = "sha256:4b6f5c376982206fb0e62545c86d23ee49d045f2e71da817a326654cd169149a", size = 44211, upload-time = "2026-05-27T01:38:29.02Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/d0/53/e94962c964644f75cae552ed2d8162cf0404d6e7004113777f355717f9ec/cloud_sql_python_connector-1.20.2-py3-none-any.whl", hash = "sha256:cbd55bf58cbd5bea8e44c5768bcecc18d4ab2bc490150d90620b3fdb518d1063", size = 50099, upload-time = "2026-04-17T19:03:35.91Z" },
+    { url = "https://files.pythonhosted.org/packages/94/ca/626917dd95d17eab155ad5f75360ca668928a0df63cc3259041ffd82ffe5/cloud_sql_python_connector-1.20.3-py3-none-any.whl", hash = "sha256:b4732920b5632be946921fa649a6ddeabfed9447a2b8088d55a6b08919ae3b85", size = 50101, upload-time = "2026-05-27T01:38:27.345Z" },
 ]
 
 [package.optional-dependencies]