diff --git a/lake-manifest.json b/lake-manifest.json
index dde4e68..dd38550 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": "60d622c124cebcecc000853cdae93f4251f4beb5",
+   "rev": "51e6e0d24db9341fb031288c298b7e6b56102253",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "main",
+   "inputRev": "51e6e0d24db9341fb031288c298b7e6b56102253",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/aesop",
    "type": "git",
    "subDir": null,
-   "rev": "70ec1d99be1e1b835d831f39c01b0d14921d2118",
+   "rev": "53ba96ad7666d4a2515292974631629b5ea5dfee",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "master",
+   "inputRev": "53ba96ad7666d4a2515292974631629b5ea5dfee",
    "inherited": false,
    "configFile": "lakefile.toml"}],
  "name": "LeanCopilot",
diff --git a/lakefile.lean b/lakefile.lean
index f34eaf9..75a0748 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" @ "main"
-require aesop from git "https://github.com/leanprover-community/aesop" @ "master"
+require batteries from git "https://github.com/leanprover-community/batteries.git" @ "51e6e0d24db9341fb031288c298b7e6b56102253" -- Lean v4.8.0
+require aesop from git "https://github.com/leanprover-community/aesop" @ "53ba96ad7666d4a2515292974631629b5ea5dfee" -- Lean v4.8.0
 
 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" @ "main"
+require «doc-gen4» from git "https://github.com/leanprover/doc-gen4" @ "cf138201a0a4fa8ca78b6e2a42a0a4860369d10e" -- Lean v4.8.0
diff --git a/lean-toolchain b/lean-toolchain
index fd2437d..66aa763 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.8.0-rc2
\ No newline at end of file
+leanprover/lean4:v4.8.0
\ No newline at end of file