diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index 77f7175b786..e31e39a483f 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -47,6 +47,10 @@ pub(crate) fn prepare_stdlib(dirs: &Dirs, rustc: &Path) {
 "#,
     )
     .unwrap();
+
+    let source_lockfile = RelPath::PATCHES.to_path(dirs).join("stdlib-lock.toml");
+    let target_lockfile = STDLIB_SRC.to_path(dirs).join("Cargo.lock");
+    fs::copy(source_lockfile, target_lockfile).unwrap();
 }
 
 pub(crate) struct GitRepo {
@@ -134,6 +138,15 @@ pub(crate) fn fetch(&self, dirs: &Dirs) {
             }
         }
 
+        let source_lockfile =
+            RelPath::PATCHES.to_path(dirs).join(format!("{}-lock.toml", self.patch_name));
+        let target_lockfile = download_dir.join("Cargo.lock");
+        if source_lockfile.exists() {
+            fs::copy(source_lockfile, target_lockfile).unwrap();
+        } else {
+            assert!(target_lockfile.exists());
+        }
+
         let actual_hash = format!("{:016x}", hash_dir(&download_dir));
         if actual_hash != self.content_hash {
             println!(
@@ -285,12 +298,4 @@ pub(crate) fn apply_patches(dirs: &Dirs, crate_name: &str, source_dir: &Path, ta
         apply_patch_cmd.arg(patch).arg("-q");
         spawn_and_wait(apply_patch_cmd);
     }
-
-    let source_lockfile = RelPath::PATCHES.to_path(dirs).join(format!("{crate_name}-lock.toml"));
-    let target_lockfile = target_dir.join("Cargo.lock");
-    if source_lockfile.exists() {
-        fs::copy(source_lockfile, target_lockfile).unwrap();
-    } else {
-        assert!(target_lockfile.exists());
-    }
 }
diff --git a/build_system/tests.rs b/build_system/tests.rs
index d104efd61e5..733a572400b 100644
--- a/build_system/tests.rs
+++ b/build_system/tests.rs
@@ -100,7 +100,7 @@ const fn jit_bin(config: &'static str, source: &'static str, args: &'static str)
     "rust-random",
     "rand",
     "50b9a447410860af8d6db9a208c3576886955874",
-    "98b2276210b30e43",
+    "446203b96054891e",
     "rand",
 );
 
@@ -110,7 +110,7 @@ const fn jit_bin(config: &'static str, source: &'static str, args: &'static str)
     "rust-lang",
     "regex",
     "32fed9429eafba0ae92a64b01796a0c5a75b88c8",
-    "d6af6507d565aa66",
+    "fcc4df7c5b902633",
     "regex",
 );
 
@@ -120,7 +120,7 @@ const fn jit_bin(config: &'static str, source: &'static str, args: &'static str)
     "rust-lang",
     "portable-simd",
     "ad8afa8c81273b3b49acbea38cd3bcf17a34cf2b",
-    "1ba291009510070b",
+    "800548f8000e31bd",
     "portable-simd",
 );
 
@@ -156,6 +156,10 @@ const fn jit_bin(config: &'static str, source: &'static str, args: &'static str)
             &LIBCORE_TESTS_SRC.to_path(&runner.dirs),
         );
 
+        let source_lockfile = RelPath::PATCHES.to_path(&runner.dirs).join("coretests-lock.toml");
+        let target_lockfile = LIBCORE_TESTS_SRC.to_path(&runner.dirs).join("Cargo.lock");
+        fs::copy(source_lockfile, target_lockfile).unwrap();
+
         LIBCORE_TESTS.clean(&runner.dirs);
 
         if runner.is_native {