diff --git a/requirements.txt b/requirements.txt
index 4d7610c..88d9420 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,9 @@
-databases[sqlite]
-databases[postgresql]
-databases[mysql]
-pydantic
-sqlalchemy
-typing_extensions
+databases[sqlite]>=0.3.2,<=0.4.1
+databases[postgresql]>=0.3.2,<=0.4.1
+databases[mysql]>=0.3.2,<=0.4.1
+pydantic>=1.6.1,<=1.8
+sqlalchemy>=1.3.18,<=1.3.23
+typing_extensions>=3.7,<=3.7.4.3
 orjson
 cryptography