diff --git a/lake-manifest.json b/lake-manifest.json
index f7f8ea7..6053b22 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -4,19 +4,19 @@
  [{"url": "https://github.com/leanprover-community/batteries.git",
    "type": "git",
    "subDir": null,
-   "rev": "6a63eb6a326181df29d95a84ce1f16c1145e66d8",
+   "rev": "194b50cb40f6aaf5596e378ec612f24985d5a1a5",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "6a63eb6a326181df29d95a84ce1f16c1145e66d8",
+   "inputRev": "194b50cb40f6aaf5596e378ec612f24985d5a1a5",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/aesop",
    "type": "git",
    "subDir": null,
-   "rev": "8a2b60ac1d3e5b6295abc5ca07b9473594c3bcb1",
+   "rev": "f465af4466eeb1f195692745fd58bb3f552692f1",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "8a2b60ac1d3e5b6295abc5ca07b9473594c3bcb1",
+   "inputRev": "f465af4466eeb1f195692745fd58bb3f552692f1",
    "inherited": false,
    "configFile": "lakefile.toml"}],
  "name": "LeanCopilot",
diff --git a/lakefile.lean b/lakefile.lean
index c5fa013..45bfeb0 100644
--- a/lakefile.lean
+++ b/lakefile.lean
@@ -302,8 +302,8 @@ extern_lib libleanffi pkg := do
   buildStaticLib (pkg.nativeLibDir / name) #[ct2O]
 
 
-require batteries from git "https://github.com/leanprover-community/batteries.git" @ "6a63eb6a326181df29d95a84ce1f16c1145e66d8" -- Lean v4.9.0-rc1
-require aesop from git "https://github.com/leanprover-community/aesop" @ "8a2b60ac1d3e5b6295abc5ca07b9473594c3bcb1" -- Lean v4.9.0-rc1
+require batteries from git "https://github.com/leanprover-community/batteries.git" @ "194b50cb40f6aaf5596e378ec612f24985d5a1a5" -- Lean v4.9.0-rc2
+require aesop from git "https://github.com/leanprover-community/aesop" @ "f465af4466eeb1f195692745fd58bb3f552692f1" -- Lean v4.9.0-rc2
 
 meta if get_config? env = some "dev" then -- dev is so not everyone has to build it
-require «doc-gen4» from git "https://github.com/leanprover/doc-gen4" @ "1cae40a2dd0dca57030385ff53d72c3aa7b27f2b" -- Lean v4.9.0-rc1
+require «doc-gen4» from git "https://github.com/leanprover/doc-gen4" @ "1f51169609a3a7c448558c3d3eb353fb355c7025" -- Lean v4.9.0-rc2
diff --git a/lean-toolchain b/lean-toolchain
index 971c526..d0bb556 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.9.0-rc1
\ No newline at end of file
+leanprover/lean4:v4.9.0-rc2
\ No newline at end of file