diff --git a/Cargo.lock b/Cargo.lock
index ae13f32..b34cb96 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -285,7 +285,7 @@ checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
 
 [[package]]
 name = "migrate"
-version = "0.5.0"
+version = "0.5.1"
 dependencies = [
  "anyhow",
  "chrono",
diff --git a/Cargo.toml b/Cargo.toml
index 4d25a03..cad5325 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "migrate"
-version = "0.5.0"
+version = "0.5.1"
 edition = "2021"
 description = "Generic file migration tool for applying ordered transformations to a project directory"
 license = "MIT"
diff --git a/src/commands/up.rs b/src/commands/up.rs
index 465fade..dde797b 100644
--- a/src/commands/up.rs
+++ b/src/commands/up.rs
@@ -42,6 +42,51 @@ pub fn run(
 
     if pending.is_empty() {
         println!("No pending migrations.");
+
+        // Even with no pending migrations, --baseline should clean up stale
+        // migration files that are at or below the existing baseline version.
+        if create_baseline && !keep {
+            if let Some(baseline) = &state.baseline {
+                let stale: Vec<_> = available
+                    .iter()
+                    .filter(|m| m.version.as_str() <= baseline.version.as_str())
+                    .collect();
+
+                if !stale.is_empty() {
+                    if dry_run {
+                        let asset_dir_count = stale
+                            .iter()
+                            .filter(|m| {
+                                m.file_path
+                                    .parent()
+                                    .map(|p| p.join(&m.id).is_dir())
+                                    .unwrap_or(false)
+                            })
+                            .count();
+                        if asset_dir_count > 0 {
+                            println!(
+                                "Would delete {} stale migration file(s) and {} asset directory(ies)",
+                                stale.len(),
+                                asset_dir_count
+                            );
+                        } else {
+                            println!("Would delete {} stale migration file(s)", stale.len());
+                        }
+                    } else {
+                        let deleted = delete_baselined_migrations(&baseline.version, &available)?;
+                        let (files, dirs): (Vec<&DeletedItem>, Vec<&DeletedItem>) =
+                            deleted.iter().partition(|d| !d.is_directory);
+                        if !files.is_empty() {
+                            println!("Deleted {} stale migration file(s)", files.len());
+                        }
+                        if !dirs.is_empty() {
+                            println!("Deleted {} stale asset directory(ies)", dirs.len());
+                        }
+                    }
+                }
+            }
+        }
+
         return Ok(());
     }
 
diff --git a/tests/integration.rs b/tests/integration.rs
index 6a795b3..81a4733 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -396,3 +396,85 @@ fn test_status_shows_applied_and_pending() {
     assert!(stdout.contains("Pending (1)"));
     assert!(stdout.contains("00002-second"));
 }
+
+#[test]
+fn test_up_baseline_cleans_stale_migrations() {
+    let temp_dir = create_temp_dir();
+    let migrations_dir = temp_dir.path().join("migrations");
+    fs::create_dir(&migrations_dir).unwrap();
+
+    // Create a migration and apply it with --baseline
+    let migration = migrations_dir.join("00001-init.sh");
+    fs::write(
+        &migration,
+        "#!/usr/bin/env bash\nset -euo pipefail\necho init\n",
+    )
+    .unwrap();
+    let mut perms = fs::metadata(&migration).unwrap().permissions();
+    perms.set_mode(0o755);
+    fs::set_permissions(&migration, perms).unwrap();
+
+    let output = Command::new(get_binary_path())
+        .args([
+            "--root",
+            temp_dir.path().to_str().unwrap(),
+            "up",
+            "--baseline",
+        ])
+        .output()
+        .expect("Failed to execute command");
+    assert!(output.status.success());
+
+    // Migration file should be deleted by baseline
+    assert!(
+        !migrations_dir.join("00001-init.sh").exists(),
+        "Migration file should have been deleted by baseline"
+    );
+
+    // Now simulate the old migration file reappearing (e.g., git merge)
+    let reappeared = migrations_dir.join("00001-init.sh");
+    fs::write(
+        &reappeared,
+        "#!/usr/bin/env bash\nset -euo pipefail\necho init\n",
+    )
+    .unwrap();
+    let mut perms = fs::metadata(&reappeared).unwrap().permissions();
+    perms.set_mode(0o755);
+    fs::set_permissions(&reappeared, perms).unwrap();
+
+    assert!(
+        migrations_dir.join("00001-init.sh").exists(),
+        "Migration file should exist again after simulated reappearance"
+    );
+
+    // Run up --baseline again. No migrations should be applied, but the stale
+    // file should be cleaned up.
+    let output = Command::new(get_binary_path())
+        .args([
+            "--root",
+            temp_dir.path().to_str().unwrap(),
+            "up",
+            "--baseline",
+        ])
+        .output()
+        .expect("Failed to execute command");
+
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(output.status.success(), "Should succeed: {}", stdout);
+    assert!(
+        stdout.contains("No pending migrations"),
+        "Should report no pending migrations: {}",
+        stdout
+    );
+    assert!(
+        stdout.contains("stale migration"),
+        "Should report cleaning stale migrations: {}",
+        stdout
+    );
+
+    // The reappeared migration file should be deleted
+    assert!(
+        !migrations_dir.join("00001-init.sh").exists(),
+        "Stale migration file should have been cleaned up"
+    );
+}