diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 00bf7a2..7c9bf05 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -54,7 +54,7 @@ jobs:
           python-version: ${{ matrix.python_version }}
 
       - name: Install pip dependencies
-        run: pip install .[test]
+        run: pip install .[cocod,test]
 
 #      - name: Start Redis
 #        uses: supercharge/redis-github-action@1.8.1
diff --git a/Dockerfile b/Dockerfile
index 594e4bb..1e7dea5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ RUN apt-get update && \
     apt-get install -y apt-utils git build-essential curl \
     libmariadb-dev libevent-dev && \
     pip install --use-deprecated=legacy-resolver flask && \
-    pip install --use-deprecated=legacy-resolver /coco
+    pip install --use-deprecated=legacy-resolver /coco[cocod]
 
 #-----------------------
 # Minimize container size
diff --git a/coco/util.py b/coco/util.py
index ed79556..5ca2180 100644
--- a/coco/util.py
+++ b/coco/util.py
@@ -11,7 +11,6 @@
 from datetime import timedelta
 from urllib.parse import urlparse
 
-import msgpack
 import yaml
 
 from .exceptions import InternalError
@@ -328,6 +327,8 @@ def hash_dict(dict_: dict):
     -------
     Hash
     """
+    import msgpack
+
     serialized = msgpack.packb(sort_dict(dict_), use_bin_type=True)
     _md5 = hashlib.md5()
     _md5.update(serialized)
diff --git a/pyproject.toml b/pyproject.toml
index 42dfa7c..8799ada 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,21 +18,21 @@ dynamic = ["readme", "version"]
 license = "GPL-3.0-or-later"
 license-files = [ "LICENSE" ]
 dependencies = [
-  "comet @ git+https://github.com/chime-experiment/comet.git",
   "aiohttp",
-  "async_timeout",
   "click>=8.2",
+  "pyyaml",
+]
+
+[project.optional-dependencies]
+cocod = [
+  "comet @ git+https://github.com/chime-experiment/comet.git",
   "deepdiff",
   "jinja2",
-  "mmh3",
   "msgpack",
   "prometheus_client<0.8",
-  "pyyaml",
   "redis>=4.2.0",
   "sanic>=20.6.0"
 ]
-
-[project.optional-dependencies]
 test = [
   "fakeredis[lua]",
   "pyfakefs >= 5.4",