diff --git a/third_party/objectify/v4_1/METADATA b/third_party/objectify/v4_1/METADATA
deleted file mode 100644
index 266e9c36d..000000000
--- a/third_party/objectify/v4_1/METADATA
+++ /dev/null
@@ -1,46 +0,0 @@
-# Format: domain_registry/devtools/metadata/metadata.proto (go/domain_registrymetadata)
-
-# Maintainer Notes:
-#
-#   git clone https://github.com/objectify/objectify.git
-#   git checkout -b v4 remotes/origin/v4
-#   mvn package
-#   # wait like literally an hour
-#   cp target/objectify-4.1.3.jar $g3/third_party/java/objectify/v4_1
-#   cp target/objectify-4.1.3-sources.jar $g3/third_party/java/objectify/v4_1/target/objectify-4.1.3-src.jar
-#
-# MIT License file downloaded from license links at
-# https://code.google.com/p/objectify-appengine/
-# https://code.google.com/p/objectify-gwt/
-
-name: "Objectify-Appengine"
-description:
-    "Objectify-Appengine is a thin Java wrapper around Google App Engine's "
-    "low-level datastore API that allows you to persist type-safe POJO "
-    "objects.  It provides a human-friendly query interface, generified key, "
-    "query, and prepared query classes, GWT-able entity objects, and "
-    "transactions in one lightweight jar file with no dependencies."
-
-third_party {
-  url {
-    type: GIT
-    value: "https://github.com/objectify/objectify/"
-  }
-  url {
-    type: ARCHIVE
-    value: "http://central.maven.org/maven2/com/googlecode/objectify/objectify-gwt/1.0/objectify-gwt-1.0-sources.jar"
-  }
-  version: "d6df0e3f291440c620c72be6650bf7fdafc8c1b2"
-  last_upgrade_date { year: 2015 month: 2 day: 9 }
-  local_modifications:
-"This library includes custom serializers for AppEngine classes in "
-"com.google.appengine.api.* packages.  This is necessary because serializers are "
-"discovered by AppEngine using a naming pattern that requires that the data and "
-"serializer classes be in the same package (similar to how the Java Beans "
-"introspector finds BeanInfo classes). "
-""
-"In Objectify versions 4.1 and later, the GWT emulation classes were broken "
-"out into a separate versioned jar. Since we are jarjar repackaging the "
-"core Objectify library to include a version number in the package, we need "
-"to include the GWT files in this folder and apply the same changes to them."
-}
diff --git a/third_party/objectify/v4_1/README.md b/third_party/objectify/v4_1/README.md
new file mode 100644
index 000000000..d4719db18
--- /dev/null
+++ b/third_party/objectify/v4_1/README.md
@@ -0,0 +1,19 @@
+This library includes custom serializers for AppEngine classes in
+com.google.appengine.api.* packages.  This is necessary because serializers
+are discovered by AppEngine using a naming pattern that requires that the
+data and serializer classes be in the same package (similar to how the Java
+Beans introspector finds BeanInfo classes).
+
+In Objectify versions 4.1 and later, the GWT emulation classes were broken
+out into a separate versioned jar. Since we are jarjar repackaging the core
+Objectify library to include a version number in the package, we need to
+include the GWT files in this folder and apply the same changes to them.
+
+The specific patches are:
+
+* Fix ofy().load().fromEntity(...) to respect @OnLoad callbacks.
+* Add Session.getKeys() to enumerate everything read in a session.
+
+These changes are already in upstream, but no 4.x release has been made
+that incorporates them. Therefore we need to backport them and vendor the
+Objectify libarary here.