Updating version.json and repo version numbers to: 21.12
diff --git a/protobuf_version.bzl b/protobuf_version.bzl
index 20c8577..4ac031c 100644
--- a/protobuf_version.bzl
+++ b/protobuf_version.bzl
@@ -1,4 +1,4 @@
-PROTOC_VERSION = "21.11"
-PROTOBUF_JAVA_VERSION = "3.21.11"
-PROTOBUF_PYTHON_VERSION = "4.21.11"
-PROTOBUF_PHP_VERSION = "3.21.11"
+PROTOC_VERSION = "21.12"
+PROTOBUF_JAVA_VERSION = "3.21.12"
+PROTOBUF_PYTHON_VERSION = "4.21.12"
+PROTOBUF_PHP_VERSION = "3.21.12"