diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1fa27d6..9628b5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [v0.5.0] - 2021-08-20
+
+### Removed
+- `stac` module and global PySTAC dependency
+
 ## [v0.4.6] - 2021-07-15
 
 ### Changed
@@ -135,7 +140,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 Initial Release
 
-[Unreleased]: https://github.com/cirrus-geo/cirrus-lib/compare/v0.4.6...main
+[Unreleased]: https://github.com/cirrus-geo/cirrus-lib/compare/v0.5.0...main
+[v0.5.0]: https://github.com/cirrus-geo/cirrus-lib/compare/v0.4.6...v0.5.0
 [v0.4.6]: https://github.com/cirrus-geo/cirrus-lib/compare/v0.4.5...v0.4.6
 [v0.4.5]: https://github.com/cirrus-geo/cirrus-lib/compare/v0.4.4...v0.4.5
 [v0.4.4]: https://github.com/cirrus-geo/cirrus-lib/compare/v0.4.3...v0.4.4
diff --git a/cirruslib/stac.py b/cirruslib/stac.py
deleted file mode 100644
index d00802b..0000000
--- a/cirruslib/stac.py
+++ /dev/null
@@ -1,84 +0,0 @@
-import boto3
-import json
-import logging
-import os
-
-from boto3utils import s3
-from typing import Dict, Optional, List
-
-from pystac import STAC_IO, Catalog, CatalogType, Collection, Link
-
-logger = logging.getLogger(__name__)
-
-# envvars
-DATA_BUCKET = os.getenv('CIRRUS_DATA_BUCKET', None)
-STAC_VERSION = os.getenv('CIRRUS_STAC_VERSION', '1.0.0-beta.2')
-DESCRIPTION = os.getenv('CIRRUS_STAC_DESCRIPTION', 'Cirrus STAC')
-AWS_REGION = os.getenv('AWS_REGION')
-PUBLISH_TOPIC = os.getenv('CIRRUS_PUBLISH_TOPIC_ARN', None)
-PUBLIC_CATALOG = os.getenv('CIRRUS_PUBLIC_CATALOG', False)
-if isinstance(PUBLIC_CATALOG, str):
-    PUBLIC_CATALOG = True if PUBLIC_CATALOG.lower() == 'true' else False
-
-# root catalog
-ROOT_URL = f"s3://{DATA_BUCKET}"
-if PUBLIC_CATALOG:
-    ROOT_URL = s3.s3_to_https(ROOT_URL, region=AWS_REGION)
-
-# boto3 clients
-snsclient = boto3.client('sns')
-
-
-def s3stac_read(uri):
-    if uri.startswith('http'):
-        uri = s3.https_to_s3(uri)
-    return json.dumps(s3().read_json(uri))
-
-def s3stac_write(uri, txt):
-    extra = {
-        'ContentType': 'application/json'
-    }
-    if uri.startswith('http'):
-        uri = s3.https_to_s3(uri)
-    s3().upload_json(json.loads(txt), uri, extra=extra, public=PUBLIC_CATALOG)
-
-STAC_IO.read_text_method = s3stac_read
-STAC_IO.write_text_method = s3stac_write
-
-
-def get_root_catalog():
-    """Get Cirrus root catalog from s3
-
-    Returns:
-        Dict: STAC root catalog
-    """
-    caturl = f"{ROOT_URL}/catalog.json"
-    if s3().exists(caturl):
-        cat = Catalog.from_file(caturl)
-    else:
-        catid = DATA_BUCKET.split('-data-')[0]
-        cat = Catalog(id=catid, description=DESCRIPTION)
-        cat.normalize_and_save(ROOT_URL, CatalogType.ABSOLUTE_PUBLISHED)
-    logger.debug(f"Fetched {cat.describe()}")
-    return cat
-
-
-# add this collection to Cirrus catalog
-def add_collections(collections, publish=True):
-
-    for collection in collections:
-        collection.remove_links('child')
-        link = Link('copied_from', collection)
-        collection.add_link(link, collection.get_self_href())
-        ROOT_CATALOG.add_child(collection)
-        if publish:
-            child_json = json.dumps(collection.to_dict())
-            logger.debug(f"Publishing {collection.id}: {child_json}")
-            response = snsclient.publish(TopicArn=PUBLISH_TOPIC, Message=child_json)
-            logger.debug(f"SNS Publish response: {json.dumps(response)}")
- 
-    ROOT_CATALOG.normalize_and_save(ROOT_URL, CatalogType.ABSOLUTE_PUBLISHED)
-    return ROOT_CATALOG
-
-
-ROOT_CATALOG = get_root_catalog()
\ No newline at end of file
diff --git a/cirruslib/version.py b/cirruslib/version.py
index ab45471..2b8877c 100644
--- a/cirruslib/version.py
+++ b/cirruslib/version.py
@@ -1 +1 @@
-__version__ = '0.4.6'
+__version__ = '0.5.0'
diff --git a/requirements.txt b/requirements.txt
index 2a4d84e..45ed9e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
 boto3-utils~=0.3.2
-pystac~=0.5.0
 requests>=2.24.0
 python-json-logger~=2.0