diff --git a/gptscript/gptscript.py b/gptscript/gptscript.py
index 6e09c45..614aed0 100644
--- a/gptscript/gptscript.py
+++ b/gptscript/gptscript.py
@@ -1,4 +1,5 @@
 import json
+import platform
 import os
 from socket import socket
 from subprocess import Popen, PIPE
@@ -144,4 +145,8 @@ def _get_command():
     if os.getenv("GPTSCRIPT_BIN") is not None:
         return os.getenv("GPTSCRIPT_BIN")
 
-    return os.path.join(os.path.dirname(executable), "gptscript")
+    bin_path = os.path.join(os.path.dirname(executable), "gptscript")
+    if platform.system() == "Windows":
+        bin_path += ".exe"
+
+    return bin_path if os.path.exists(bin_path) else "gptscript"
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index e906478..f21a66b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,7 @@ license = { file = "LICENSE" }
 dependencies = [
     "certifi==2024.2.2",
     "charset-normalizer==3.3.2",
+    "httpx==0.27.0",
     "idna==3.6",
     "requests==2.31.0",
     "tqdm==4.66.2",