diff --git a/pyproject.toml b/pyproject.toml
index 0ad01fad..53be2f03 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ scripts = [
     { include-group = "packaging" },
     "python-dotenv==1.2.2",
     "tzdata==2026.2",
-    "tzlocal==5.3.1",
+    "tzlocal==5.4.3",
 ]
 uv = [
     "uv==0.11.21",
diff --git a/uv.lock b/uv.lock
index dee3f183..8fd7c1eb 100644
--- a/uv.lock
+++ b/uv.lock
@@ -477,7 +477,7 @@ scripts = [
     { name = "packaging", specifier = "==26.2" },
     { name = "python-dotenv", specifier = "==1.2.2" },
     { name = "tzdata", specifier = "==2026.2" },
-    { name = "tzlocal", specifier = "==5.3.1" },
+    { name = "tzlocal", specifier = "==5.4.3" },
 ]
 uv = [{ name = "uv", specifier = "==0.11.21" }]
 
@@ -1202,14 +1202,14 @@ wheels = [
 
 [[package]]
 name = "tzlocal"
-version = "5.3.1"
+version = "5.4.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "tzdata", marker = "sys_platform == 'win32'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/8b/2e/c14812d3d4d9cd1773c6be938f89e5735a1f11a9f184ac3639b93cef35d5/tzlocal-5.3.1.tar.gz", hash = "sha256:cceffc7edecefea1f595541dbd6e990cb1ea3d19bf01b2809f362a03dd7921fd", size = 30761, upload-time = "2025-03-05T21:17:41.549Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/48/55/15e2340963d2bfedcc6042da3911438fd336f8ae96b65bdbe3a29766da0c/tzlocal-5.4.3.tar.gz", hash = "sha256:3a8c9bc18cf47e1dcde252ea0e6a72a6cde320a400b6ac6db1f1f8cccd553c00", size = 30873, upload-time = "2026-06-17T04:17:41.764Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c2/14/e2a54fabd4f08cd7af1c07030603c3356b74da07f7cc056e600436edfa17/tzlocal-5.3.1-py3-none-any.whl", hash = "sha256:eb1a66c3ef5847adf7a834f1be0800581b683b5608e74f86ecbcef8ab91bb85d", size = 18026, upload-time = "2025-03-05T21:17:39.857Z" },
+    { url = "https://files.pythonhosted.org/packages/42/28/fc144409c71569e928585f8f3c629d80d1ca3ef40175e9222f01588f98c9/tzlocal-5.4.3-py3-none-any.whl", hash = "sha256:24ce97bb58e2a973f7640ec2553ab4e6f6d5a0d0d1aa9dc43bca21d89e1feb82", size = 18039, upload-time = "2026-06-17T04:17:40.027Z" },
 ]
 
 [[package]]