diff --git a/build.gradle b/build.gradle
index 53ebba39..2be061b5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -77,7 +77,7 @@ java {
 // All it does is complain about generated code.
 javadoc { options.addStringOption('Xdoclint:none', '-quiet') }
 
-def grpcVersion = "1.39.0"
+def grpcVersion = "1.55.1"
 def protocVersion = "3.17.3"
 def authzedProtoCommit = "125e39e67bf60b2d19c4de15aaa69cb1bcbda28c"
 def bufDir = "${buildDir}/buf"