diff --git a/requirements.txt b/requirements.txt
index 21eedc9..3873f11 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ pathtools==0.1.2
 Pillow==9.0.1
 pooch==1.3.0
 promise==2.3
-protobuf==3.15.8
+protobuf==3.18.3
 psutil==5.8.0
 pycparser==2.20
 pyparsing==2.4.7