diff --git a/pyproject.toml b/pyproject.toml
index b697f8b325..48212177d1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,6 @@ dependencies = [
     "ophyd-async[ca,pva]>=0.13.7",
     "bluesky>=1.14.5",
     "pyepics",
-    "dataclasses-json",
     "pillow",
     "zocalo>=1.0.0",
     "requests",