diff --git a/docs/env.md b/docs/env.md
index 1ce94dcd..86ba596c 100644
--- a/docs/env.md
+++ b/docs/env.md
@@ -21,6 +21,7 @@ These are the environment variables you can set for the `impress-backend` contai
 | AWS_S3_ENDPOINT_URL                             | S3 endpoint                                                                                                                                                                |                                                                         |
 | AWS_S3_REGION_NAME                              | Region name for s3 endpoint                                                                                                                                                |                                                                         |
 | AWS_S3_SECRET_ACCESS_KEY                        | Access key for s3 endpoint                                                                                                                                                 |                                                                         |
+| AWS_S3_SIGNATURE_VERSION                        | S3 signature version (`s3v4` or `s3`)                                                                                                                                      | s3v4                                                                    |
 | AWS_STORAGE_BUCKET_NAME                         | Bucket name for s3 endpoint                                                                                                                                                | impress-media-storage                                                   |
 | CACHES_DEFAULT_TIMEOUT                          | Cache default timeout                                                                                                                                                      | 30                                                                      |
 | CACHES_DEFAULT_KEY_PREFIX                               | The prefix used to every cache keys.                                                                                                                                       | docs                                                                    |
diff --git a/src/backend/impress/settings.py b/src/backend/impress/settings.py
index 80d3a149..f3c65e4b 100755
--- a/src/backend/impress/settings.py
+++ b/src/backend/impress/settings.py
@@ -169,6 +169,11 @@ class Base(Configuration):
         environ_name="AWS_STORAGE_BUCKET_NAME",
         environ_prefix=None,
     )
+    AWS_S3_SIGNATURE_VERSION = values.Value(
+        "s3v4",
+        environ_name="AWS_S3_SIGNATURE_VERSION",
+        environ_prefix=None,
+    )
 
     # Document images
     DOCUMENT_IMAGE_MAX_SIZE = values.IntegerValue(