diff --git a/appengine/sdk.bzl b/appengine/sdk.bzl
index 08d2aa9..b324551 100644
--- a/appengine/sdk.bzl
+++ b/appengine/sdk.bzl
@@ -14,7 +14,7 @@
 """Language agnostic utility functions for use in the other .bzl files.
 """
 
-load(":variables.bzl", "SDK_URL_PREFIX")
+load(":variables.bzl", "APPENGINE_VERSION", "SDK_URL_PREFIX")
 
 def _find_locally_or_download_impl(repository_ctx):
   lang = repository_ctx.attr.lang
@@ -52,7 +52,8 @@ find_locally_or_download = repository_rule(
         ),
         "version": attr.string(
             mandatory = True,
-            doc = "The SDK version to download. Usually of the form 1.9.57.",
+            doc = "The SDK version to download. Usually of the form %s."
+                  % APPENGINE_VERSION,
         ),
         "strip_prefix_pattern": attr.string(
             default = "google_appengine",
diff --git a/appengine/variables.bzl b/appengine/variables.bzl
index bee09e7..0bec374 100644
--- a/appengine/variables.bzl
+++ b/appengine/variables.bzl
@@ -2,14 +2,15 @@
 """
 # Not all languages are released for every SDK version. Whenever possible, set
 # ${LANG}_SDK_VERSION = APPENGINE_VERSION.
-APPENGINE_VERSION = "1.9.57"
+APPENGINE_VERSION = "1.9.63"
 
 SDK_URL_PREFIX = "https://storage.googleapis.com/appengine-sdks/featured"
 
-JAVA_SDK_SHA256 = "63f89be498d1e7462c03fe2b66d7773a9e5dd04ffb71e3b59a5fa74a7b810997"
+JAVA_SDK_SHA256 = "477eb0bdec2c98fa68e4d0d9cbd1329c140e907fa64be2c3c9c065373369e93b"
 
 JAVA_SDK_VERSION = APPENGINE_VERSION
 
-PY_SDK_SHA256 = "d5c4fad8afa2ce9005481575c01558248a0fbe0b4554c6de060e925899cfbf66"
+PY_SDK_SHA256 = "76b90b3a780c6dfd2e5dcd9d79ec8be2ab7c1146fd445e472f18e3aeb90fabc5"
 
-PY_SDK_VERSION = APPENGINE_VERSION
+# Note: Python ahead of Java
+PY_SDK_VERSION = "1.9.69"