diff --git a/poetry.lock b/poetry.lock
index f20e31dc..c3ee2955 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -339,23 +339,22 @@ files = [
 
 [[package]]
 name = "gunicorn"
-version = "22.0.0"
+version = "21.2.0"
 description = "WSGI HTTP Server for UNIX"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.5"
 files = [
-    {file = "gunicorn-22.0.0-py3-none-any.whl", hash = "sha256:350679f91b24062c86e386e198a15438d53a7a8207235a78ba1b53df4c4378d9"},
-    {file = "gunicorn-22.0.0.tar.gz", hash = "sha256:4a0b436239ff76fb33f11c07a16482c521a7e09c1ce3cc293c2330afe01bec63"},
+    {file = "gunicorn-21.2.0-py3-none-any.whl", hash = "sha256:3213aa5e8c24949e792bcacfc176fef362e7aac80b76c56f6b5122bf350722f0"},
+    {file = "gunicorn-21.2.0.tar.gz", hash = "sha256:88ec8bff1d634f98e61b9f65bc4bf3cd918a90806c6f5c48bc5603849ec81033"},
 ]
 
 [package.dependencies]
 packaging = "*"
 
 [package.extras]
-eventlet = ["eventlet (>=0.24.1,!=0.36.0)"]
+eventlet = ["eventlet (>=0.24.1)"]
 gevent = ["gevent (>=1.4.0)"]
 setproctitle = ["setproctitle"]
-testing = ["coverage", "eventlet", "gevent", "pytest", "pytest-cov"]
 tornado = ["tornado (>=0.2)"]
 
 [[package]]
@@ -627,4 +626,4 @@ brotli = ["brotli"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "dc92f61547a417a8de65de388cfccf773ad58934105b683222c50bd363e1c493"
+content-hash = "500f510a0376578d5515202ac8aebddc7c7ac60ce4dbbb699a17b6b403fada42"
diff --git a/pyproject.toml b/pyproject.toml
index f94589a5..7218ea03 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,9 @@ django-tagging = "*"
 boto3 = "*"
 certifi = "*"
 dj-database-url = "*"
-gunicorn = "*"
+# gunicorn 22.* has Worker (no URI read) issue
+# https://github.com/benoitc/gunicorn/issues/3207
+gunicorn = "~21.2.0"
 psycopg2 = "*"
 sentry-sdk = "*"
 whitenoise = "*"
diff --git a/signbank/dictionary/tests/tests_tasks.py b/signbank/dictionary/tests/tests_tasks.py
index 02cfca8a..41b7aa96 100644
--- a/signbank/dictionary/tests/tests_tasks.py
+++ b/signbank/dictionary/tests/tests_tasks.py
@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 import random
+import tempfile
 from unittest import mock
 
 from django.conf import settings
@@ -35,24 +36,22 @@ def setUp(self):
 
     @override_settings(MEDIA_ROOT="")
     def test_retrieve_videos_for_glosses(self):
+
         video_details = [
             {
                 "url": "/kiwifruit_1.mp4",
-                "file_name": (
-                    f"{settings.MEDIA_ROOT}/glossvideo/"
-                    f"{self.gloss.pk}-{self.gloss.idgloss}_finalexample_1.png"
-                ),
+                "file_name": f"{self.gloss.pk}-{self.gloss.idgloss}_finalexample_1.png",
                 "gloss_pk": self.gloss.pk,
                 "video_type": "finalexample1",
                 "version": 0
             }
         ]
-        dummy_file = SimpleUploadedFile(
-            video_details[0]["file_name"], b'data \x00\x01', content_type="video/mp4")
+        dummy_file = tempfile.NamedTemporaryFile()
+        dummy_file.write(b'data \x00\x01')
 
         with mock.patch("signbank.dictionary.tasks.urlretrieve") as mock_retrieve:
             with mock.patch("signbank.dictionary.tasks.connection.close") as mock_close_connection:
-                mock_retrieve.return_value = (dummy_file, None)
+                mock_retrieve.return_value = (dummy_file.name, None)
                 mock_close_connection.return_value = None
                 retrieve_videos_for_glosses(video_details)
                 mock_retrieve.assert_called_once()
diff --git a/signbank/video/models.py b/signbank/video/models.py
index 1aa8ede0..623f11e0 100644
--- a/signbank/video/models.py
+++ b/signbank/video/models.py
@@ -34,6 +34,7 @@ def url(self, name):
 
 
 class GlossVideoDynamicStorage(import_string(settings.GLOSS_VIDEO_FILE_STORAGE)):
+
     def public_url(self, name):
         """ Return the public URL to the object in S3 or local storage.
         This is NOT a presigned URL, use #url for that.