diff --git a/README.md b/README.md
index fcf8b72..e05ee74 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,7 @@ require LeanCopilot from git "https://github.com/lean-dojo/LeanCopilot.git" @ "L
 `LEAN_COPILOT_VERSION` depends on your lean-toolchain:
 | lean-toolchain | Recommended Lean Copilot version |
 | -------------- | -------------------------------- |
+| `v4.9.0`       | `v1.4.0`                         |
 | `v4.9.0-rc3`   | `v1.3.3`                         |
 | `v4.9.0-rc2`   | `v1.3.2`                         |
 | `v4.9.0-rc1`   | `v1.3.1`                         |
diff --git a/lakefile.lean b/lakefile.lean
index 2a42039..53f13f0 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" @ "73c7f46f4c0eaa48e9538c9fd108d3ee5524868a" -- Lean v4.9.0-rc3
-require aesop from git "https://github.com/leanprover-community/aesop" @ "f465af4466eeb1f195692745fd58bb3f552692f1" -- Lean v4.9.0-rc3
+require batteries from git "https://github.com/leanprover-community/batteries.git" @ "54bb04c3119f24fde14b9068c4b2e69db52a1450" -- Lean v4.9.0
+require aesop from git "https://github.com/leanprover-community/aesop" @ "06cca4bd36b2af743d4858c5cc31604aa9da26bc" -- Lean v4.9.0
 
 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" @ "1f51169609a3a7c448558c3d3eb353fb355c7025" -- Lean v4.9.0-rc3
+require «doc-gen4» from git "https://github.com/leanprover/doc-gen4" @ "1daa0de7eea6bf8d3e1b0814156ede21a8a9e9e9" -- Lean v4.9.0
diff --git a/lean-toolchain b/lean-toolchain
index cab936c..e8da500 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.9.0-rc3
\ No newline at end of file
+leanprover/lean4:v4.9.0
\ No newline at end of file