diff --git a/lean-toolchain b/lean-toolchain
index e6a8c3c1..18640c8b 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.31.0-rc2
+leanprover/lean4:v4.31.0
diff --git a/test/Mathlib/lake-manifest.json b/test/Mathlib/lake-manifest.json
index 9d1bee57..8c0ce28d 100644
--- a/test/Mathlib/lake-manifest.json
+++ b/test/Mathlib/lake-manifest.json
@@ -5,17 +5,17 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "d90090f647cae4f4ad4da99c0ac8bab2ca8c34ab",
+   "rev": "fabf563a7c95a166b8d7b6efca11c8b4dc9d911f",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.31.0-rc2",
+   "inputRev": "v4.31.0",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "744117af710b1c0400cd297c9ce91f8d0ad3a347",
+   "rev": "63045536fe95024e6c18fc7b48e03f506701c5bc",
    "name": "plausible",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -35,7 +35,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "99c763c8a96d3d44fb4994e96eaa51ca4568449d",
+   "rev": "5c7542ed018c78194f1e2b903eaf6a792b74c03d",
    "name": "importGraph",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -45,50 +45,50 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "1537e3fc7e680d64e06fe5fb95c4c9edee7941c2",
+   "rev": "24b0d9dc081c5423f8eec7e866c441e5184f29d9",
    "name": "proofwidgets",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v0.0.101",
+   "inputRev": "main",
    "inherited": true,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/aesop",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "7897ea6e5cfc6522d355083bdfa798377ab35e11",
+   "rev": "e3cb2f741431ce31bf73549fb52316a57368b06f",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.31.0-rc2",
+   "inputRev": "master",
    "inherited": true,
    "configFile": "lakefile.toml"},
   {"url": "https://github.com/leanprover-community/quote4",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "94346b7b49c36ae871639d1434232f057c193d60",
+   "rev": "f46324995fca5f0483b742e4eb4daec7f4ee50d2",
    "name": "Qq",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.31.0-rc2",
+   "inputRev": "master",
    "inherited": true,
    "configFile": "lakefile.toml"},
   {"url": "https://github.com/leanprover-community/batteries",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "460b61adc7d183e43db2b99ac6c1dede9f7a76df",
+   "rev": "fa08db58b30eb033edcdab331bba000827f9f785",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.31.0-rc2",
+   "inputRev": "main",
    "inherited": true,
    "configFile": "lakefile.toml"},
   {"url": "https://github.com/leanprover/lean4-cli",
    "type": "git",
    "subDir": null,
    "scope": "leanprover",
-   "rev": "baf3e62fbb3502305076ca077e004aea78157c63",
+   "rev": "92564e5770e4d09f2d86dfbf8ada1e9c715b384c",
    "name": "Cli",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.31.0-rc2",
+   "inputRev": "v4.31.0",
    "inherited": true,
    "configFile": "lakefile.toml"}],
  "name": "«repl-mathlib-tests»",
diff --git a/test/Mathlib/lakefile.toml b/test/Mathlib/lakefile.toml
index 5b2179ba..f1d8d33a 100644
--- a/test/Mathlib/lakefile.toml
+++ b/test/Mathlib/lakefile.toml
@@ -4,7 +4,7 @@ defaultTargets = ["ReplMathlibTests"]
 [[require]]
 name = "mathlib"
 git = "https://github.com/leanprover-community/mathlib4"
-rev = "v4.31.0-rc2"
+rev = "v4.31.0"
 
 [[lean_lib]]
 name = "ReplMathlibTests"
diff --git a/test/Mathlib/lean-toolchain b/test/Mathlib/lean-toolchain
index e6a8c3c1..18640c8b 100644
--- a/test/Mathlib/lean-toolchain
+++ b/test/Mathlib/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.31.0-rc2
+leanprover/lean4:v4.31.0