diff --git a/pyproject.toml b/pyproject.toml
index b8d251e..1eb7dac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ requires-python = ">=3.10"
 dependencies = [
     "cryptography >= 44.0.0",
     "requests >= 2.33.1",
-    "pydantic == 2.13.4"
+    "pydantic == 2.13.5"
 ]
 description = "Accept bitcoin with BitPay"
 readme = "README.md"