diff --git a/README.md b/README.md
index e04a106..5d0c031 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ moreLinkArgs = ["-L./.lake/packages/LeanCopilot/.lake/build/lib", "-lctranslate2
 require LeanCopilot from git "https://github.com/lean-dojo/LeanCopilot.git" @ "LEAN_COPILOT_VERSION"
 ```
 
-For stable Lean versions (e.g., `v4.27.0`), set `LEAN_COPILOT_VERSION` to be that version. For the latest unstable Lean versions (e.g., `v4.28.0-rc1`), set `LEAN_COPILOT_VERSION` to `main`. In either case, make sure the version is compatible with other dependencies such as mathlib. If your project uses lakefile.toml instead of lakefile.lean, it should include:
+For stable Lean versions (e.g., `v4.28.0`), set `LEAN_COPILOT_VERSION` to be that version. For the latest unstable Lean versions (e.g., `v4.29.0-rc1`), set `LEAN_COPILOT_VERSION` to `main`. In either case, make sure the version is compatible with other dependencies such as mathlib. If your project uses lakefile.toml instead of lakefile.lean, it should include:
 
 ```toml
 [[require]]
diff --git a/lake-manifest.json b/lake-manifest.json
index 8c810e0..88a44d6 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -5,20 +5,20 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "cb837cc26236ada03c81837bebe0acd9c70ced7d",
+   "rev": "f642a64c76df8ba9cb53dba3b919425a0c2aeaf1",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "cb837cc26236ada03c81837bebe0acd9c70ced7d",
+   "inputRev": "f642a64c76df8ba9cb53dba3b919425a0c2aeaf1",
    "inherited": false,
    "configFile": "lakefile.toml"},
   {"url": "https://github.com/leanprover-community/batteries.git",
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "4ca6ac27b5b03d9554013a85343f75f43501175a",
+   "rev": "495c008c3e3f4fb4256ff5582ddb3abf3198026f",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "4ca6ac27b5b03d9554013a85343f75f43501175a",
+   "inputRev": "495c008c3e3f4fb4256ff5582ddb3abf3198026f",
    "inherited": false,
    "configFile": "lakefile.toml"}],
  "name": "LeanCopilot",
diff --git a/lakefile.lean b/lakefile.lean
index 947e9d0..e25c914 100644
--- a/lakefile.lean
+++ b/lakefile.lean
@@ -422,8 +422,8 @@ extern_lib libleanffi pkg := do
   buildStaticLib (pkg.sharedLibDir / name) #[ct2O]
 
 
-require batteries from git "https://github.com/leanprover-community/batteries.git" @ "4ca6ac27b5b03d9554013a85343f75f43501175a"
-require aesop from git "https://github.com/leanprover-community/aesop" @ "cb837cc26236ada03c81837bebe0acd9c70ced7d"
+require batteries from git "https://github.com/leanprover-community/batteries.git" @ "495c008c3e3f4fb4256ff5582ddb3abf3198026f"
+require aesop from git "https://github.com/leanprover-community/aesop" @ "f642a64c76df8ba9cb53dba3b919425a0c2aeaf1"
 
 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" @ "main"
diff --git a/lean-toolchain b/lean-toolchain
index 2bb276a..ea6ca7f 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.27.0
\ No newline at end of file
+leanprover/lean4:v4.28.0
\ No newline at end of file