diff --git a/poetry.lock b/poetry.lock
index c9d4c4c..d24b72d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -433,13 +433,13 @@ toml = ["tomli"]
 
 [[package]]
 name = "croniter"
-version = "2.0.7"
+version = "3.0.3"
 description = "croniter provides iteration for datetime object with cron like format"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.6"
 files = [
-    {file = "croniter-2.0.7-py2.py3-none-any.whl", hash = "sha256:f15e80828d23920c4bb7f4d9340b932c9dcabecafc7775703c8b36d1253ed526"},
-    {file = "croniter-2.0.7.tar.gz", hash = "sha256:1041b912b4b1e03751a0993531becf77851ae6e8b334c9c76ffeffb8f055f53f"},
+    {file = "croniter-3.0.3-py2.py3-none-any.whl", hash = "sha256:b3bd11f270dc54ccd1f2397b813436015a86d30ffc5a7a9438eec1ed916f2101"},
+    {file = "croniter-3.0.3.tar.gz", hash = "sha256:34117ec1741f10a7bd0ec3ad7d8f0eb8fa457a2feb9be32e6a2250e158957668"},
 ]
 
 [package.dependencies]
@@ -2063,4 +2063,4 @@ test = ["big-O", "importlib-resources", "jaraco.functools", "jaraco.itertools",
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "ec0c6af9aeb6c8e9d1069769e810bba65f8d6ba814112c587a742dc4a194f438"
+content-hash = "76d0eaed193b84b42ec541056b1c510cf7776f7a7a12fdc6aeb8f32cb37f7991"
diff --git a/pyproject.toml b/pyproject.toml
index 6348ecd..ff5f4d9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ Changelog = "https://github.com/andrewthetechie/py-healthchecks.io/releases"
 python = "^3.8"
 pydantic = ">=1.9.1,<3.0.0"
 httpx = ">=0.23.0,<0.28.0"
-croniter = ">=1.1,<3.0"
+croniter = ">=1.1,<4.0"
 pytz = ">=2024.1,<2025.0"
 packaging = "^24.1"