diff --git a/.gitignore b/.gitignore
index a2b5be1..00ed0f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -185,6 +185,7 @@ $RECYCLE.BIN/
 
 /target
 Cargo.lock
+.cargo/
 
 .pnp.*
 .yarn/*
diff --git a/.replit b/.replit
new file mode 100644
index 0000000..7ce2db0
--- /dev/null
+++ b/.replit
@@ -0,0 +1,17 @@
+run = "bun run build:debug && bun test"
+modules = ["bun-1.0:v17-20240117-0bd73cd", "nodejs-20:v24-20240117-0bd73cd", "rust-stable:v4-20240117-0bd73cd"]
+
+disableGuessImports = true
+disableInstallBeforeRun = true
+
+[nix]
+channel = "stable-23_11"
+
+[rules]
+
+[rules.formatter]
+
+[rules.formatter.fileExtensions]
+
+[rules.formatter.fileExtensions.".ts"]
+id = "module:nodejs-20:v24-20240117-0bd73cd/formatter:prettier"
diff --git a/bun.lockb b/bun.lockb
index 00f7cc9..488a467 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/index.js b/index.js
index a63da8c..1481fc1 100644
--- a/index.js
+++ b/index.js
@@ -266,6 +266,20 @@ switch (platform) {
           }
         }
         break
+      case 's390x':
+        localFileExisted = existsSync(
+          join(__dirname, 'ruspty.linux-s390x-gnu.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./ruspty.linux-s390x-gnu.node')
+          } else {
+            nativeBinding = require('@replit/ruspty-linux-s390x-gnu')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
       default:
         throw new Error(`Unsupported architecture on Linux: ${arch}`)
     }
diff --git a/index.test.ts b/index.test.ts
index e32a484..26fb335 100644
--- a/index.test.ts
+++ b/index.test.ts
@@ -17,7 +17,7 @@ describe("PTY", () => {
         expect(err).toBeNull();
         expect(exitCode).toBe(0);
         done();
-      }
+      },
     );
 
     const readStream = fs.createReadStream("", { fd: pty.fd });
@@ -38,7 +38,7 @@ describe("PTY", () => {
         expect(err).toBeNull();
         expect(exitCode).toBe(17);
         done();
-      }
+      },
     );
   });
 
@@ -85,19 +85,12 @@ describe("PTY", () => {
     writeStream.write("stty size; echo 'done1'\n");
   });
 
-  test.skip("respects working directory", (done) => {
-    const pty = new Pty(
-      "/bin/pwd",
-      [],
-      {},
-      CWD,
-      [80, 24],
-      (err, exitCode) => {
-        expect(err).toBeNull();
-        expect(exitCode).toBe(0);
-        done();
-      }
-    );
+  test("respects working directory", (done) => {
+    const pty = new Pty("/bin/pwd", [], {}, CWD, [80, 24], (err, exitCode) => {
+      expect(err).toBeNull();
+      expect(exitCode).toBe(0);
+      done();
+    });
 
     const readStream = fs.createReadStream("", { fd: pty.fd });
 
@@ -112,7 +105,7 @@ describe("PTY", () => {
 
     const pty = new Pty(
       "/bin/sh",
-      ["-c", "echo $ENV_VARIABLE; exit"],
+      ["-c", "sleep 0.1s && echo $ENV_VARIABLE; exit"],
       {
         ENV_VARIABLE: message,
       },
@@ -122,8 +115,9 @@ describe("PTY", () => {
         expect(err).toBeNull();
         expect(exitCode).toBe(0);
         expect(buffer).toBe(message + "\r\n");
+
         done();
-      }
+      },
     );
 
     const readStream = fs.createReadStream("", { fd: pty.fd });
diff --git a/replit.nix b/replit.nix
new file mode 100644
index 0000000..66babba
--- /dev/null
+++ b/replit.nix
@@ -0,0 +1,3 @@
+{ pkgs }: {
+    deps = [];
+}
\ No newline at end of file