diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62b535d..6eaf082 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [PEP 440](https://www.python.org/dev/peps/pep-0440/)
 and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.5]
+
+### Changed
+- Avoid multipart uploads by using a very large chunk_size so the S3 ETag will always be an md5 checksum.
+
 ## [0.1.4]
 
 ### Added
diff --git a/environment.yml b/environment.yml
index 9c7dc94..633e390 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ dependencies:
   - pip
   - gdal>=3.0
   - shapely
-  - hyp3lib>=4,<5
+  - hyp3lib>=4.0.1,<5
   - boto3
   - jinja2
   # For packaging, and testing
diff --git a/requirements-static.txt b/requirements-static.txt
index 32b7581..01b0c99 100644
--- a/requirements-static.txt
+++ b/requirements-static.txt
@@ -1,5 +1,5 @@
-ruff==0.12.2
-mypy==1.16.1
+ruff==0.12.7
+mypy==1.17.1
 lxml-stubs
 types-shapely
 types-requests
diff --git a/src/hyp3_opera_rtc/upload_rtc.py b/src/hyp3_opera_rtc/upload_rtc.py
index dca6e2b..16a297e 100644
--- a/src/hyp3_opera_rtc/upload_rtc.py
+++ b/src/hyp3_opera_rtc/upload_rtc.py
@@ -14,7 +14,7 @@ def upload_rtc(bucket: str, bucket_prefix: str, output_dir: Path) -> None:
         output_files.append(output_zip)
 
     for output_file in output_files:
-        upload_file_to_s3(output_file, bucket, bucket_prefix)
+        upload_file_to_s3(output_file, bucket, bucket_prefix, chunk_size=100_000_000)
 
 
 def make_zip(output_files: list[Path], output_dir: Path) -> Path: