diff --git a/requirements.txt b/requirements.txt
index 5f0cd96..5e7a6d2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ packaging==20.3
 pandas==1.0.3
 pdf2image==1.12.1
 Pillow==7.0.0
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 Pygments==2.6.1