diff --git a/setup.py b/setup.py
index 67ed6c52..aadec59a 100644
--- a/setup.py
+++ b/setup.py
@@ -56,6 +56,7 @@
         "pymongo>=4.0",
         "pyyaml>=5.4.1",
         "dnspython>=1.16.0",
+        "thinc>=8.3.0,<8.4.0",
     ],
     extras_require={
         "craft": ["torch>=0.12"],