diff --git a/Dockerfile b/Dockerfile
index ddcf50a..7b26960 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,13 +5,13 @@ LABEL "com.github.actions.description"="Sync a directory to an AWS S3 repository
 LABEL "com.github.actions.icon"="refresh-cw"
 LABEL "com.github.actions.color"="green"
 
-LABEL version="0.5.1"
+LABEL version="0.6.1"
 LABEL repository="https://github.com/jakejarvis/s3-sync-action"
 LABEL homepage="https://jarv.is/"
 LABEL maintainer="Jake Jarvis <jake@jarv.is>"
 
 # https://github.com/aws/aws-cli/blob/master/CHANGELOG.rst
-ENV AWSCLI_VERSION='1.17.1'
+ENV AWSCLI_VERSION='1.18.201'
 
 RUN pip install --quiet --no-cache-dir awscli==${AWSCLI_VERSION}
 
diff --git a/README.md b/README.md
index ecd0d31..5a075d0 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,7 @@ The following settings must be passed as environment variables as shown in the e
 | `AWS_S3_BUCKET` | The name of the bucket you're syncing to. For example, `jarv.is` or `my-app-releases`. | `secret env` | **Yes** | N/A |
 | `AWS_REGION` | The region where you created your bucket. Set to `us-east-1` by default. [Full list of regions here.](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-available-regions) | `env` | No | `us-east-1` |
 | `AWS_S3_ENDPOINT` | The endpoint URL of the bucket you're syncing to. Can be used for [VPC scenarios](https://aws.amazon.com/blogs/aws/new-vpc-endpoint-for-amazon-s3/) or for non-AWS services using the S3 API, like [DigitalOcean Spaces](https://www.digitalocean.com/community/tools/adapting-an-existing-aws-s3-application-to-digitalocean-spaces). | `env` | No | Automatic (`s3.amazonaws.com` or AWS's region-specific equivalent) |
+| `AWS_S3_MULTIPART_THRESHOLD` | When uploading, downloading, or copying a file, the S3 commands will switch to multipart operations if the file reaches a given size threshold. The [multipart_threshold](https://docs.aws.amazon.com/cli/latest/topic/s3-config.html#multipart-threshold) controls this value. | `env` | No | 8MB |
 | `SOURCE_DIR` | The local directory (or file) you wish to sync/upload to S3. For example, `public`. Defaults to your entire repository. | `env` | No | `./` (root of cloned repository) |
 | `DEST_DIR` | The directory inside of the S3 bucket you wish to sync/upload to. For example, `my_project/assets`. Defaults to the root of the bucket. | `env` | No | `/` (root of bucket) |
 
diff --git a/entrypoint.sh b/entrypoint.sh
index 466e69c..a74f281 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -37,6 +37,10 @@ ${AWS_REGION}
 text
 EOF
 
+if [ -n "$AWS_S3_MULTIPART_THRESHOLD" ]; then
+  sh -c "aws configure set s3.multipart_threshold ${AWS_S3_MULTIPART_THRESHOLD} --profile s3-sync-action"
+fi
+
 # Sync using our dedicated profile and suppress verbose messages.
 # All other flags are optional via the `args:` directive.
 sh -c "aws s3 sync ${SOURCE_DIR:-.} s3://${AWS_S3_BUCKET}/${DEST_DIR} \