diff --git a/build.gradle b/build.gradle
index e9e30829..572454b6 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 = "1.65.1"
+def grpcVersion = "1.66.0"
 def protocVersion = "3.25.3"
 def authzedProtoCommit = "v1.35.0"
 def bufDir = "${buildDir}/buf"