diff --git a/poetry.lock b/poetry.lock
index eed64854..2113b23a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2575,4 +2575,4 @@ tsconcat = ["ba-tsconcat", "bids2table", "elbow", "imagesize", "nibabel", "numpy
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<4.0"
-content-hash = "780014116856fb94b6e446101486e3326496cbd3d8212e1381cfd1935adce53d"
+content-hash = "e28e90e667b21a672cfcdb93cfe3c5fb01d4f5b5c72c9e8f9528cb064dfaed34"
diff --git a/pyproject.toml b/pyproject.toml
index d375f348..322f6245 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,6 +24,7 @@ dependencies = [
   "semver",
   "spython>=0.3.0",
   "tabulate>=0.8.6",
+  "tomli; python_version < '3.11'",
   "tornado",
   "websocket-client"
 ]
diff --git a/src/cpac/helpers/store_optional_dependencies.py b/src/cpac/helpers/store_optional_dependencies.py
index 9501c360..40f3cd9c 100755
--- a/src/cpac/helpers/store_optional_dependencies.py
+++ b/src/cpac/helpers/store_optional_dependencies.py
@@ -4,11 +4,16 @@
 from itertools import chain
 from pathlib import Path
 from pickle import dump, load
-import tomllib
 from typing import cast
 
 from packaging.requirements import Requirement
 
+try:
+    import tomllib
+except ImportError:
+    # Python < 3.11
+    import tomli as tomllib
+
 PICKLE_PATH = Path(__file__).parents[1] / "optional_dependencies.pkl"