diff --git a/pyproject.toml b/pyproject.toml
index a13938c5..6a497eca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
   "torch ~= 2.0.1",
   "torchvision ~= 0.15.2",
   "lightning[extra] ~= 2.0.5", # Full functionality including TensorboardX.
-  "pydantic == 1.10.11", # https://github.com/Lightning-AI/lightning/pull/18022/files
+  "pydantic == 2.2.1", # https://github.com/Lightning-AI/lightning/pull/18022/files
   "torchmetrics == 1.0.1",
   "numpy == 1.23.5", # https://github.com/pytorch/pytorch/issues/91516