diff --git a/.scala-steward.conf b/.scala-steward.conf
index 4a8a1424..5f09c9ae 100644
--- a/.scala-steward.conf
+++ b/.scala-steward.conf
@@ -13,6 +13,8 @@ updates.pin = [
   { groupId = "org.scala-lang", artifactId = "scala3-library", version = "3.3." }
   # protobuf 4 is not well supported
   { groupId = "com.google.protobuf", artifactId = "protobuf-java", version = "3." }
+  # Mockito 5 requires Java 11+
+  { groupId = "org.mockito", artifactId = "mockito-core", version = "4." }
 ]
 
 updatePullRequests = "always"