diff --git a/requirements.txt b/requirements.txt
index 80237052..ac3af013 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ pillow
 numpy
 pytest
 dataclasses
-pydantic
\ No newline at end of file
+pydantic<2.0.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 2e6e8ab4..c75fa244 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
         # client:
         "requests",
         "urllib3",
-        "pydantic"
+        "pydantic<2.0.0"
     ],
     tests_require=[
         "pytest",