diff --git a/pyproject.toml b/pyproject.toml
index 23b55d8..13ca344 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ dependencies = [
     "numpy ~= 1.24",
     "pyyaml ~= 6.0",
     "std_daq_client ~= 1.3",
-    "pyepics ~= 3.5",
+    "pyepics ~= 3.5, <3.5.3",
     "pytest ~= 8.0",
     "h5py ~= 3.10",
     "hdf5plugin ~= 4.3",