diff --git a/build.sbt b/build.sbt
index 2ebdf2c07..eb95edd8d 100644
--- a/build.sbt
+++ b/build.sbt
@@ -124,7 +124,7 @@ lazy val core = (project in file("."))
       "org.typelevel" %% "cats-effect-testkit" % catsEffectVersion % Test,
       "co.fs2" %% "fs2-core" % fs2Version,
       "co.fs2" %% "fs2-io" % fs2Version,
-      "com.google.protobuf" % "protobuf-java" % "3.25.3",
+      "com.google.protobuf" % "protobuf-java" % "4.27.2",
       "org.tpolecat" %% "natchez-core" % natchezVersion,
     ) ++ scalaTestDeps ++ sttpDeps ++ circeDeps(CrossVersion.partialVersion(scalaVersion.value)),
     scalacOptions ++= (CrossVersion.partialVersion(scalaVersion.value) match {