diff --git a/icalevents/icalparser.py b/icalevents/icalparser.py
index 3cb2cf9..3f29427 100644
--- a/icalevents/icalparser.py
+++ b/icalevents/icalparser.py
@@ -15,10 +15,14 @@
 from icalendar.prop import vDDDLists, vText
 from uuid import uuid4
 
-from icalendar.windows_to_olson import WINDOWS_TO_OLSON
+from icalendar import use_pytz
+from icalendar.timezone.windows_to_olson import WINDOWS_TO_OLSON
 from pytz import timezone
 
 
+use_pytz()
+
+
 def now():
     """
     Get current time.
diff --git a/poetry.lock b/poetry.lock
index de5f287..f8e03bd 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -179,18 +179,21 @@ pyparsing = {version = ">=2.4.2,<3.0.0 || >3.0.0,<3.0.1 || >3.0.1,<3.0.2 || >3.0
 
 [[package]]
 name = "icalendar"
-version = "5.0.13"
+version = "6.0.0"
 description = "iCalendar parser/generator"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "icalendar-5.0.13-py3-none-any.whl", hash = "sha256:5ded5415e2e1edef5ab230024a75878a7a81d518a3b1ae4f34bf20b173c84dc2"},
-    {file = "icalendar-5.0.13.tar.gz", hash = "sha256:92799fde8cce0b61daa8383593836d1e19136e504fa1671f471f98be9b029706"},
+    {file = "icalendar-6.0.0-py3-none-any.whl", hash = "sha256:567e718551d800362db04ca09777295336e1803f6fc6bc0a7a5e258917fa8ed0"},
+    {file = "icalendar-6.0.0.tar.gz", hash = "sha256:7ddf60d343f3c1f716de9b62f6e80ffd95d03cab62464894a0539feab7b5c76e"},
 ]
 
 [package.dependencies]
 python-dateutil = "*"
-pytz = "*"
+tzdata = "*"
+
+[package.extras]
+test = ["coverage", "hypothesis", "pytest", "pytz"]
 
 [[package]]
 name = "iniconfig"
@@ -394,7 +397,18 @@ files = [
     {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
 ]
 
+[[package]]
+name = "tzdata"
+version = "2024.2"
+description = "Provider of IANA time zone data"
+optional = false
+python-versions = ">=2"
+files = [
+    {file = "tzdata-2024.2-py2.py3-none-any.whl", hash = "sha256:a48093786cdcde33cad18c2555e8532f34422074448fbc874186f0abd79565cd"},
+    {file = "tzdata-2024.2.tar.gz", hash = "sha256:7d85cc416e9382e69095b7bdf4afd9e3880418a2413feec7069d533d6b4e31cc"},
+]
+
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "68594b7cc9f3e251efac690fcee26e2c4b2256a38a9d76d121d6831d93b32493"
+content-hash = "3fdb4deb42940f9f19ac71a0d915b2445b66fda8e4b44c232c15cf0b5838f867"
diff --git a/pyproject.toml b/pyproject.toml
index ac149ee..997f225 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ readme = "README.md"
 
 [tool.poetry.dependencies]
 python = "^3.9"
-icalendar = "5.0.13"
+icalendar = "^6.0.0"
 python-dateutil = "^2.9.0"
 pytz = "^2024.1"
 httplib2 = "^0.22.0"