diff --git a/pyproject.toml b/pyproject.toml
index a2845ff26..f376dcdff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ classifiers = [
 ]
 requires = [
     "starlette ==0.14.2",
-    "pydantic >=1.0.0,<2.0.0"
+    "pydantic >=1.6.2,!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0"
 ]
 description-file = "README.md"
 requires-python = ">=3.6"