diff --git a/.github/workflows/pythonpublish.yml b/.github/workflows/pythonpublish.yml
index edc61330..992b05a6 100644
--- a/.github/workflows/pythonpublish.yml
+++ b/.github/workflows/pythonpublish.yml
@@ -22,6 +22,8 @@ jobs:
         python-version: '3.x'
     - name: Install dependencies
       run: |
+        curl -LO https://github.com/kaitai-io/kaitai_struct_compiler/releases/download/0.9/kaitai-struct-compiler_0.9_all.deb
+        sudo apt-get install ./kaitai-struct-compiler_0.9_all.deb
         python -m pip install --upgrade pip
         pip install setuptools wheel twine
     - name: Build and publish
diff --git a/polyfile/version.py b/polyfile/version.py
index c6d84c5a..ce9c4283 100644
--- a/polyfile/version.py
+++ b/polyfile/version.py
@@ -19,7 +19,7 @@ def git_branch():
 DEV_BUILD = False
 
 
-__version__ = (0, 3, 0)
+__version__ = (0, 3, 1)
 
 if DEV_BUILD:
     branch_name = git_branch()
diff --git a/setup.py b/setup.py
index 18c4b672..44413cdb 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,11 @@
 import concurrent.futures
 import json
+import shutil
 from multiprocessing import cpu_count
 import os
 from pathlib import Path
 from setuptools import setup, find_packages
+from shutil import which
 import subprocess
 import sys
 from typing import Any, Dict, List, Optional, Tuple
@@ -47,6 +49,10 @@ def compile_ksy(path: Path) -> List[Tuple[str, str]]:
 if not MANIFEST_PATH.exists() or newest_definition > MANIFEST_PATH.stat().st_mtime:
     # the definitions have been updated, so we need to recompile everything
 
+    if shutil.which("kaitai-struct-compiler") is None:
+        sys.stderr.write("Error: You must have kaitai-struct-compiler installed")
+        sys.exit(1)
+
     num_files = sum(1 for _ in KAITAI_FORMAT_LIBRARY.glob("**/*.ksy"))
 
     try:
@@ -56,17 +62,19 @@ def tqdm(*args, **kwargs):
             class TQDM:
                 def __enter__(self):
                     return self
+
                 def __exit__(self, exc_type, exc_val, exc_tb):
                     pass
-                def write(self, message, *args, **kwargs):
+
+                def write(self, message, *_, **__):
                     sys.stderr.write(message)
                     sys.stderr.write("\n")
                     sys.stderr.flush()
+
                 def update(self, n: int):
                     pass
             return TQDM()
 
-
     ksy_manifest: Dict[str, Dict[str, Any]] = {}
 
     with tqdm(leave=False, desc="Compiling the Kaitai Struct Format Library", total=num_files) as t: