diff --git a/lake-manifest.json b/lake-manifest.json
index d8a8062..735faac 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -1,4 +1,4 @@
-{"version": 7,
+{"version": "1.0.0",
  "packagesDir": ".lake/packages",
  "packages":
  [{"url": "https://github.com/leanprover/lean4-cli",
@@ -13,7 +13,7 @@
   {"url": "https://github.com/leanprover-community/batteries",
    "type": "git",
    "subDir": null,
-   "rev": "51e6e0d24db9341fb031288c298b7e6b56102253",
+   "rev": "6a63eb6a326181df29d95a84ce1f16c1145e66d8",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
diff --git a/lean-toolchain b/lean-toolchain
index ef1f67e..0ba3faf 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.8.0
+leanprover/lean4:v4.9.0-rc1