diff --git a/.changes/unreleased/Dependencies-20231010-103815.yaml b/.changes/unreleased/Dependencies-20231010-103815.yaml
new file mode 100644
index 00000000..a1be669a
--- /dev/null
+++ b/.changes/unreleased/Dependencies-20231010-103815.yaml
@@ -0,0 +1,6 @@
+kind: Dependencies
+body: relax more-itertools dependency
+time: 2023-10-10T10:38:15.507159+01:00
+custom:
+  Author: lukedyer-peak luke321321
+  PR: "174"
diff --git a/pyproject.toml b/pyproject.toml
index f34f95c6..d1ec56d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
   "pydantic~=1.10",
   "jsonschema~=4.0",
   "PyYAML~=6.0",
-  "more-itertools~=8.0",
+  "more-itertools>=8.0,<11.0",
   "Jinja2~=3.0",
   "click>=7.0,<9.0",
   "python-dateutil~=2.0",