diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 902e96e..d219f5e 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,3 +1,13 @@
+- Require `type` property to be set for Catalog and Collections
+- Fix validator for Item `datetime` and Common MetaData `start_datetime` and `end_datetime`
+- Make sure all `datetime` fields are correctly parsed
+- Include `datetime` and `license` to Common MetaData
+- Make sure default values for required but unset fields are correctly parsed
+- Add support from Python 3.12
+- Lint all files
+- Increase test coverage
+
+
 3.0.0 (2024-01-25)
 ------------------
 - Support pydantic>2.0 (@huard)
diff --git a/pyproject.toml b/pyproject.toml
index f504939..25ec974 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,9 +3,9 @@ requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
 
 [project]
-name="stac-pydantic"
-description="Pydantic data models for the STAC spec"
-classifiers=[
+name = "stac-pydantic"
+description = "Pydantic data models for the STAC spec"
+classifiers = [
         "Intended Audience :: Developers",
         "Intended Audience :: Information Technology",
         "Intended Audience :: Science/Research",
@@ -13,13 +13,17 @@ classifiers=[
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
-        "License :: OSI Approved :: MIT License",
-    ]
-keywords=["stac", "pydantic", "validation"]
-authors=[{ name = "Arturo Engineering", email = "engineering@arturo.ai"}]
-license= { text = "MIT" }
-requires-python=">=3.8"
-dependencies = ["click>=8.1.7", "pydantic>=2.4.1", "geojson-pydantic>=1.0.0", "ciso8601~=2.3"]
+        "Programming Language :: Python :: 3.12",
+        "License :: OSI Approved :: MIT License"]
+keywords = ["stac", "pydantic", "validation"]
+authors = [{ name = "Arturo Engineering", email = "engineering@arturo.ai" }]
+license = { text = "MIT" }
+requires-python = ">=3.8"
+dependencies = [
+        "click>=8.1.7",
+        "pydantic>=2.4.1",
+        "geojson-pydantic>=1.0.0",
+        "ciso8601~=2.3"]
 dynamic = ["version", "readme"]
 
 [project.scripts]
@@ -27,10 +31,11 @@ stac-pydantic = "stac_pydantic.scripts.cli:app"
 
 [project.urls]
 homepage = "https://github.com/stac-utils/stac-pydantic"
-repository ="https://github.com/stac-utils/stac-pydantic.git"
+repository = "https://github.com/stac-utils/stac-pydantic.git"
 
 [project.optional-dependencies]
-dev = ["arrow>=1.2.3",
+dev = [
+        "arrow>=1.2.3",
         "pytest>=7.4.2",
         "pytest-cov>=4.1.0",
         "pytest-icdiff>=0.8",
@@ -39,7 +44,8 @@ dev = ["arrow>=1.2.3",
         "dictdiffer>=0.9.0",
         "jsonschema>=4.19.1",
         "pyyaml>=6.0.1"]
-lint = ["types-requests>=2.31.0.5",
+lint = [
+        "types-requests>=2.31.0.5",
         "types-jsonschema>=4.19.0.3",
         "types-PyYAML>=6.0.12.12",
         "black>=23.9.1",
@@ -52,10 +58,10 @@ lint = ["types-requests>=2.31.0.5",
 
 [tool.setuptools.dynamic]
 version = { attr = "stac_pydantic.version.__version__" }
-readme = {file = ["README.md"], content-type = "text/markdown"}
+readme = { file = ["README.md"], content-type = "text/markdown" }
 
 [tool.setuptools.package-data]
-stac_pydantic= ["*.typed"]
+stac_pydantic = ["*.typed"]
 
 [tool.setuptools.packages.find]
 include = ["stac_pydantic*"]
@@ -81,6 +87,6 @@ exclude = ["tests", ".venv"]
 
 [tool.flake8]
 ignore = ["E203", "E501"]
-select = ["C","E","F","W","B","B950"]
+select = ["C", "E", "F", "W", "B", "B950"]
 exclude = ["tests", ".venv"]
 max-line-length = 88
diff --git a/stac_pydantic/item.py b/stac_pydantic/item.py
index f002fa8..685b9b2 100644
--- a/stac_pydantic/item.py
+++ b/stac_pydantic/item.py
@@ -1,6 +1,5 @@
 from typing import Any, Dict, List, Optional
 
-from ciso8601 import parse_rfc3339
 from geojson_pydantic import Feature
 from pydantic import AnyUrl, ConfigDict, Field, model_serializer, model_validator
 
@@ -33,9 +32,6 @@ def validate_datetime(cls, data: Any) -> Any:
                         "start_datetime and end_datetime must be specified when datetime is null"
                     )
                 data["datetime"] = None
-            else:
-                if isinstance(datetime, str):
-                    data["datetime"] = parse_rfc3339(datetime)
 
         return data