diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2bd48b0..892859b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+v0.3.4 (in development)
+-----------------------
+- Support PyYAML 6.0
+
 v0.3.3 (2021-06-12)
 -------------------
 - Fix error message displayed when an event is missing a "days" or "time" field
diff --git a/TODO.md b/TODO.md
index f2b9054..83e9769 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,6 @@
 - Support events that end at 00:00
 - Handle events that go past midnight
+- Use pydantic to parse the input?
 
 - Input format:
     - Change the input format to a YAML dict of which the list of event dicts
diff --git a/setup.cfg b/setup.cfg
index 48f9f0e..6dea159 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -24,6 +24,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Python :: Implementation :: CPython
     License :: OSI Approved :: MIT License
     Environment :: Console
@@ -43,7 +44,7 @@ python_requires = ~=3.6
 install_requires =
     attrs     >= 18.2
     click     >= 7.0
-    PyYAML    == 5.*
+    PyYAML    >= 5.0, < 7.0
     reportlab ~= 3.4
 
 [options.entry_points]
diff --git a/src/pdfschedule.py b/src/pdfschedule.py
index 1a0679d..6b37fb5 100644
--- a/src/pdfschedule.py
+++ b/src/pdfschedule.py
@@ -6,7 +6,7 @@
 more information.
 """
 
-__version__ = "0.3.3"
+__version__ = "0.3.4.dev1"
 __author__ = "John Thorvald Wodder II"
 __author_email__ = "pdfschedule@varonathe.org"
 __license__ = "MIT"