diff --git a/requirements.txt b/requirements.txt
index 6ef0fbb77..11dff81f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ cymem>=1.30,<1.32
 preshed>=0.46.1,<0.47.0
 thinc>=5.0.0,<5.1.0
 murmurhash>=0.26,<0.27
-plac
+plac<0.9.3
 six
 ujson
 cloudpickle