diff --git a/lean-toolchain b/lean-toolchain
index 025e5954..75def609 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.33.0
+leanprover/lean4:v4.34.0-rc1
diff --git a/test.sh b/test.sh
index be8e1b3f..58c5e3f2 100755
--- a/test.sh
+++ b/test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Define the paths
 IN_DIR="test"
@@ -42,5 +42,6 @@ for infile in $IN_DIR/*.in; do
 done
 
 # Run the Mathlib tests
+rm -f test/Mathlib/lean-toolchain
 cp lean-toolchain test/Mathlib/
 cd test/Mathlib/ && ./test.sh
diff --git a/test/Mathlib/lake-manifest.json b/test/Mathlib/lake-manifest.json
index 2b8b5ff4..649b190b 100644
--- a/test/Mathlib/lake-manifest.json
+++ b/test/Mathlib/lake-manifest.json
@@ -5,17 +5,17 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "db584cd6d46c92f209a44c0f1c829460d327499d",
+   "rev": "de5ce8a9a66a4aa68a9bdbb35b63a06d34d9ca11",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.33.0",
+   "inputRev": "v4.34.0-rc1",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "b7eb3304aeae834b12dda98993a37f6a41f6f0bb",
+   "rev": "38e9c3ce15cbb63c92e90bb9a92e4eb82131f669",
    "name": "plausible",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -25,7 +25,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "5f4d51b81cbd3f6b32b156bfad9056621a040404",
+   "rev": "2bc7cf064315b26bc38dac2e9612fb581be9b75f",
    "name": "LeanSearchClient",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -35,7 +35,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "16f02aa7642864af59f1ff0e384a015994db9118",
+   "rev": "978b7ec9fbbf9a535114f1de8fe5b3778b358870",
    "name": "importGraph",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -45,7 +45,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "4be2e3d5087eeb272cf5a8853b8f9dd025ef5957",
+   "rev": "99e8adeea3c3cd86b6b79ba01a1383bf2d31d055",
    "name": "proofwidgets",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -55,7 +55,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "3448c0bcc5ce01b2d1546e483ec3620e32df3d0e",
+   "rev": "c1c4362a130f12e632d252180a6c2a31d8fd4726",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -65,7 +65,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "92c15be17b7caf78c2ad767ec40f89052d908d81",
+   "rev": "3b55e9d00c6b0018e5d984eb011b6f93c09bd163",
    "name": "Qq",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -75,7 +75,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "4488d40d070b9700d4d5a6aa342f0d40c31b2a2d",
+   "rev": "01bc479e7432594821ba3fb0ca465211941de86d",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -85,10 +85,10 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover",
-   "rev": "6130a47896ce867c6a4a55373441e59e565bad0f",
+   "rev": "af8bc067a4cc6c6df472a68909a3f40b1c76c43e",
    "name": "Cli",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.33.0",
+   "inputRev": "v4.34.0-rc1",
    "inherited": true,
    "configFile": "lakefile.toml"}],
  "name": "«repl-mathlib-tests»",
diff --git a/test/Mathlib/lakefile.toml b/test/Mathlib/lakefile.toml
index 9c3f5c0a..495648cb 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 = "v4.33.0"
+rev = "v4.34.0-rc1"
 
 [[lean_lib]]
 name = "ReplMathlibTests"
diff --git a/test/Mathlib/lean-toolchain b/test/Mathlib/lean-toolchain
index 025e5954..75def609 100644
--- a/test/Mathlib/lean-toolchain
+++ b/test/Mathlib/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.33.0
+leanprover/lean4:v4.34.0-rc1
diff --git a/test/Mathlib/test.sh b/test/Mathlib/test.sh
index 0f9f89fe..76dcaba5 100755
--- a/test/Mathlib/test.sh
+++ b/test/Mathlib/test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Define the paths
 IN_DIR="test"