diff --git a/py-shared/CHANGELOG.md b/py-shared/CHANGELOG.md
index 52888c50a6d..49eccd14c81 100644
--- a/py-shared/CHANGELOG.md
+++ b/py-shared/CHANGELOG.md
@@ -16,5 +16,7 @@ where verb is one of
 
 ## Changes
 
+- [Changed] **BREAKING**: Add `scratch_buckets` required field to `S3HashLambdaParams` ([#3922](https://github.com/quiltdata/quilt/pull/3922))
+- [Added] Introduce `PackageConstructParams` ([#3922](https://github.com/quiltdata/quilt/pull/3922))
 - [Changed] Tweak checksum types ([#3888](https://github.com/quiltdata/quilt/pull/3888))
 - [Added] Bootstrap `quilt_shared` package ([#3849](https://github.com/quiltdata/quilt/pull/3849))
diff --git a/py-shared/src/quilt_shared/pkgpush.py b/py-shared/src/quilt_shared/pkgpush.py
index 902ea3a3ba5..7a0a106f59c 100644
--- a/py-shared/src/quilt_shared/pkgpush.py
+++ b/py-shared/src/quilt_shared/pkgpush.py
@@ -62,6 +62,7 @@ def boto_args(self):
 
 class S3HashLambdaParams(pydantic.BaseModel):
     credentials: AWSCredentials
+    scratch_buckets: T.Dict[str, str]
     location: S3ObjectSource
 
 
@@ -146,6 +147,10 @@ class PackagePromoteParams(PackagePushParams):
     src: PackagePromoteSource
 
 
+class PackageConstructParams(PackagePushParams):
+    scratch_buckets: T.Dict[str, str]
+
+
 class PackageConstructEntry(pydantic.BaseModel):
     logical_key: NonEmptyStr
     physical_key: NonEmptyStr