diff --git a/requirements.txt b/requirements.txt
index 8966c89ce8d..229aa73383c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ dill<0.3.9
 fastkde>=1.0.24, <1.0.31
 graph-scheduler>=1.2.1, <1.3.0
 graphviz<0.21.0
-grpcio<1.66.0
+grpcio<1.67.0
 leabra-psyneulink<0.3.3
 llvmlite<0.44
 matplotlib<3.7.6