diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 4c469b01d861..507c4a39a518 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -27,7 +27,7 @@ bluetooth-auto-recovery==1.5.2
 bluetooth-data-tools==1.28.2
 cached-ipaddress==0.10.0
 certifi>=2021.5.30
-ciso8601==2.3.2
+ciso8601==2.3.3
 cronsim==2.6
 cryptography==45.0.3
 dbus-fast==2.44.3
diff --git a/pyproject.toml b/pyproject.toml
index da23dd508d1c..0b5288955e11 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
   "awesomeversion==25.5.0",
   "bcrypt==4.3.0",
   "certifi>=2021.5.30",
-  "ciso8601==2.3.2",
+  "ciso8601==2.3.3",
   "cronsim==2.6",
   "fnv-hash-fast==1.5.0",
   # hass-nabucasa is imported by helpers which don't depend on the cloud
diff --git a/requirements.txt b/requirements.txt
index a0ec58b144a1..69c27b5bf269 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ audioop-lts==0.2.1
 awesomeversion==25.5.0
 bcrypt==4.3.0
 certifi>=2021.5.30
-ciso8601==2.3.2
+ciso8601==2.3.3
 cronsim==2.6
 fnv-hash-fast==1.5.0
 hass-nabucasa==1.1.0