diff --git a/src/env.rs b/src/env.rs
index 3dcfcbb..42de9e6 100644
--- a/src/env.rs
+++ b/src/env.rs
@@ -35,10 +35,7 @@ pub fn get_javac_ver() -> anyhow::Result<semver::Version> {
 }
 
 pub fn set_cwd<P: AsRef<Path>>(path: P) -> io::Result<()> {
-    let mut cwd = crate::PROJECT_ROOT
-        .lock()
-        .expect("Failed to lock Mutex")
-        .to_owned();
+    let mut cwd = crate::PROJECT_ROOT.clone();
     cwd.push(path.as_ref());
-    std::env::set_current_dir(cwd)
+    std::env::set_current_dir(cwd.as_path())
 }
diff --git a/src/main.rs b/src/main.rs
index 19566d2..4091fae 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,7 +8,7 @@ mod nest;
 use std::fs::OpenOptions;
 use std::io::{Read, Write};
 use std::path::{Path, PathBuf};
-use std::sync::{LazyLock, Mutex};
+use std::sync::LazyLock;
 
 use cli::{CONFIG, Command};
 use java::{JAVA_EXT_CLASS, JAVA_EXT_SOURCE};
@@ -19,19 +19,29 @@ use bytesize::ByteSize;
 
 const DIR_TARGET: LazyLock<PathBuf> = LazyLock::new(|| PathBuf::from("target/"));
 const DIR_SRC: LazyLock<PathBuf> = LazyLock::new(|| PathBuf::from("src/"));
-/// Cannot flatten this dir out of existence due to IDEs, Linters,
-/// and probably also Java expecting it to exist.
 const DIR_MAIN: LazyLock<PathBuf> = LazyLock::new(|| DIR_SRC.join("main/"));
-/// Once again, I would love to pull this out of src/ and into parent, but
-/// I can't do that due to IDEs, linters, and probably also Java expecting it to exist in src/.
 const DIR_TEST: LazyLock<PathBuf> = LazyLock::new(|| DIR_SRC.join("test/"));
 
 const F_NEST_TOML: LazyLock<PathBuf> = LazyLock::new(|| PathBuf::from("Nest.toml"));
 const F_NEST_LOCK: LazyLock<PathBuf> = LazyLock::new(|| PathBuf::from("Nest.lock"));
 
-/// This may not actually be the project root.
-pub static PROJECT_ROOT: LazyLock<Mutex<PathBuf>> = LazyLock::new(|| {
-    Mutex::new(std::env::current_dir().expect("Failed to get current working directory"))
+pub static PROJECT_ROOT: LazyLock<PathBuf> = LazyLock::new(|| {
+    // Start from CWD
+    let cwd = std::env::current_dir().expect("Failed to get current working directory");
+    let mut probe = cwd.clone();
+
+    while !probe.join(F_NEST_TOML.as_path()).exists() {
+        if !probe.pop() {
+            // This is easier than having a Result everywhere. For now.
+            panic!(
+                "No {} found in current directory or any ancestor. (cwd: {})",
+                F_NEST_TOML.display(),
+                cwd.display()
+            )
+        }
+    }
+
+    probe
 });
 
 fn main() -> anyhow::Result<()> {
@@ -70,12 +80,11 @@ fn main() -> anyhow::Result<()> {
 }
 
 fn init() -> anyhow::Result<()> {
-    let is_empty = std::fs::read_dir(PROJECT_ROOT.lock().expect("Failed to lock mutex").as_path())
-        .is_ok_and(|tree| tree.count() == 0);
+    let cwd = std::env::current_dir()?;
 
-    let project_name = PROJECT_ROOT
-        .lock()
-        .expect("Failed to lock mutex")
+    let is_empty = std::fs::read_dir(cwd.as_path()).is_ok_and(|tree| tree.count() == 0);
+
+    let project_name = cwd
         .file_name()
         .context("Invalid directory name")?
         .to_str()
@@ -167,18 +176,11 @@ fn init() -> anyhow::Result<()> {
 }
 
 fn new(project_name: String) -> anyhow::Result<()> {
-    let cwd = PROJECT_ROOT
-        .lock()
-        .expect("Failed to lock mutex")
-        .join(project_name);
+    let cwd = std::env::current_dir()?.join(project_name);
 
     std::fs::create_dir(&cwd)?;
     std::env::set_current_dir(&cwd)?;
 
-    // Replace PathBuf within mutex
-    let mut state = PROJECT_ROOT.lock().expect("Failed to lock mutex");
-    *state = std::env::current_dir().expect("Failed to change current working directory");
-
     Ok(())
 }
 
@@ -246,12 +248,7 @@ fn test(assertions: bool) -> anyhow::Result<(Option<String>, Option<String>)> {
         .compile(DIR_TEST.as_path())?;
 
     // Change cwd to avoid Java pathing issues.
-    crate::env::set_cwd(
-        PROJECT_ROOT
-            .lock()
-            .expect("Failed to lock mutex")
-            .join(DIR_TARGET.as_path()),
-    )?;
+    crate::env::set_cwd(PROJECT_ROOT.join(DIR_TARGET.as_path()))?;
 
     java::JVMBuilder::new()
         .assertions(assertions)
@@ -263,16 +260,6 @@ fn test(assertions: bool) -> anyhow::Result<(Option<String>, Option<String>)> {
 }
 
 fn clean() {
-    let _ = std::fs::remove_file(
-        PROJECT_ROOT
-            .lock()
-            .expect("Failed to lock mutex")
-            .join(F_NEST_LOCK.as_path()),
-    );
-    let _ = std::fs::remove_dir_all(
-        PROJECT_ROOT
-            .lock()
-            .expect("Failed to lock mutex")
-            .join(DIR_TARGET.as_path()),
-    );
+    let _ = std::fs::remove_file(PROJECT_ROOT.join(F_NEST_LOCK.as_path()));
+    let _ = std::fs::remove_dir_all(PROJECT_ROOT.join(DIR_TARGET.as_path()));
 }
diff --git a/src/nest.rs b/src/nest.rs
index f97010b..1a87251 100644
--- a/src/nest.rs
+++ b/src/nest.rs
@@ -11,14 +11,8 @@ use anyhow::Context;
 use semver::Version;
 use serde::{Deserialize, Serialize};
 
-pub static NEST: LazyLock<anyhow::Result<Nest>> = LazyLock::new(|| {
-    Nest::try_from(
-        PROJECT_ROOT
-            .lock()
-            .expect("Failed to lock mutex")
-            .join(F_NEST_TOML.as_path()),
-    )
-});
+pub static NEST: LazyLock<anyhow::Result<Nest>> =
+    LazyLock::new(|| Nest::try_from(PROJECT_ROOT.join(F_NEST_TOML.as_path())));
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct Nest {
@@ -133,16 +127,12 @@ impl Class {
         // If the source file exists, hasn't been moved to a package (path is a file) and
         // the associated compiled class file exists in DIR_TARGET
         PROJECT_ROOT
-            .lock()
-            .expect("Failed to lock mutex")
             .join(DIR_TARGET.as_path())
             .join(self.name.as_path())
             .with_extension(JAVA_EXT_CLASS)
             .exists()
             && sha256::try_digest(
                 PROJECT_ROOT
-                    .lock()
-                    .expect("Failed to lock mutex")
                     .join(if self.test {
                         DIR_TEST.clone()
                     } else {