diff --git a/crates/forge/tests/cli/cmd.rs b/crates/forge/tests/cli/cmd.rs
index c19a06f8ef88c..febe264c9c77c 100644
--- a/crates/forge/tests/cli/cmd.rs
+++ b/crates/forge/tests/cli/cmd.rs
@@ -2642,7 +2642,7 @@ contract GasReportFallbackTest is Test {
 +========================================================================================================+
 | Deployment Cost                                   | Deployment Size |       |        |       |         |
 |---------------------------------------------------+-----------------+-------+--------+-------+---------|
-| 117159                                            | 471             |       |        |       |         |
+| 117171                                            | 471             |       |        |       |         |
 |---------------------------------------------------+-----------------+-------+--------+-------+---------|
 |                                                   |                 |       |        |       |         |
 |---------------------------------------------------+-----------------+-------+--------+-------+---------|
@@ -2681,7 +2681,7 @@ Ran 1 test suite [ELAPSED]: 1 tests passed, 0 failed, 0 skipped (1 total tests)
   {
     "contract": "test/DelegateProxyTest.sol:DelegateProxy",
     "deployment": {
-      "gas": 117159,
+      "gas": 117171,
       "size": 471
     },
     "functions": {
diff --git a/crates/forge/tests/cli/install.rs b/crates/forge/tests/cli/install.rs
index 6d2515b9da4ba..f95f865f92bfb 100644
--- a/crates/forge/tests/cli/install.rs
+++ b/crates/forge/tests/cli/install.rs
@@ -603,29 +603,57 @@ forgetest_init!(sync_on_forge_update, |prj, cmd| {
     let forge_std = lockfile.get(&PathBuf::from("lib/forge-std")).unwrap();
     assert!(forge_std.rev() == FORGE_STD_REVISION);
 
-    // cd into the forge-std submodule and reset the master branch
+    // cd into the forge-std submodule
     let forge_std_path = prj.root().join("lib/forge-std");
     let git = Git::new(&forge_std_path);
-    git.checkout(false, "master").unwrap();
-    // Get the master head commit
-    let origin_master_head = git.head().unwrap();
-    // Reset the master branch to HEAD~1
-    git.reset(true, "HEAD~1").unwrap();
-    let local_master_head = git.head().unwrap();
-    assert_ne!(origin_master_head, local_master_head, "Master head should have changed");
-    // Now checkout back to the release tag
+
+    // Ensure we're on the release tag first (known starting point)
     git.checkout(false, forge_std.name()).unwrap();
-    assert!(git.head().unwrap() == forge_std.rev(), "Forge std should be at the release tag");
+    assert_eq!(git.head().unwrap(), forge_std.rev(), "Forge std should be at the release tag");
+
+    // Make sure origin/master is up to date, then resolve its commit hash deterministically.
+    git.fetch(false, "origin", Some("master")).unwrap();
+    let origin_master_head = git.get_rev("refs/remotes/origin/master", &forge_std_path).unwrap();
 
+    // Run update and assert the output matches the dynamically resolved hash.
     let expected_output = format!(
-        r#"Updated dep at 'lib/forge-std', (from: tag={}@{}, to: branch=master@{})
-"#,
+        "Updated dep at 'lib/forge-std', (from: tag={}@{}, to: branch=master@{})\n",
         forge_std.name(),
         forge_std.rev(),
         origin_master_head
     );
+
     cmd.forge_fuse()
         .args(["update", "foundry-rs/forge-std@master"])
         .assert_success()
         .stdout_eq(expected_output);
+
+    let git = Git::new(&forge_std_path);
+    assert_eq!(
+        git.head().unwrap(),
+        origin_master_head,
+        "Submodule HEAD should match resolved origin/master after update"
+    );
+
+    let root_git = Git::new(prj.root());
+    let submodules_after = root_git.submodules().unwrap();
+    let forge_sm = submodules_after
+        .0
+        .iter()
+        .find(|s| s.path().as_path() == Path::new("lib/forge-std"))
+        .expect("forge-std submodule should exist");
+    assert_eq!(
+        forge_sm.rev(),
+        origin_master_head,
+        "Root submodule status should match resolved origin/master after update"
+    );
+
+    let mut lockfile = Lockfile::new(prj.root());
+    lockfile.read().unwrap();
+    let forge_std_after = lockfile.get(&PathBuf::from("lib/forge-std")).unwrap();
+    assert_eq!(
+        forge_std_after.rev(),
+        origin_master_head,
+        "Lockfile rev should match resolved origin/master after update"
+    );
 });
diff --git a/testdata/forge-std-rev b/testdata/forge-std-rev
index 7e643990d82d5..4e410e40484a9 100644
--- a/testdata/forge-std-rev
+++ b/testdata/forge-std-rev
@@ -1 +1 @@
-7117c90c8cf6c68e5acce4f09a6b24715cea4de6
\ No newline at end of file
+c29afdd40a82db50a3d3709d324416be50050e5e
\ No newline at end of file