diff --git a/dnatranslate/requirements.txt b/dnatranslate/requirements.txt
index be5b3ff..a5af542 100644
--- a/dnatranslate/requirements.txt
+++ b/dnatranslate/requirements.txt
@@ -29,7 +29,7 @@ parso==0.7.1
 pexpect==4.2.1
 Pillow==8.1.1
 pluggy==0.13.1
-protobuf==3.0.0
+protobuf==3.18.3
 pycairo==1.16.2
 pycrypto==2.6.1
 pycups==1.9.73