diff --git a/Dockerfile b/Dockerfile
index 7639ac2..4a59cde 100755
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM python:3.13-slim AS builder
 WORKDIR /app
 COPY . .
+RUN apt-get update && apt-get install -y nodejs npm && npm install -g terser clean-css-cli
 RUN pip install --no-cache-dir -r ./requirements.txt
 RUN zensical build
 RUN rm ./deploy/sitemap.xml
diff --git a/minify.py b/minify.py
index fce7588..99e1a90 100755
--- a/minify.py
+++ b/minify.py
@@ -2,30 +2,75 @@
 """Minify CSS, JS, and HTML files in the deploy directory in-place."""
 
 import re
+import subprocess
 import sys
 from pathlib import Path
 
-import rcssmin
-import rjsmin
-
 DEPLOY_DIR = Path("./deploy")
 
 
-def minify_html_content(content):
-    content = re.sub(r"<!--.*?-->", "", content, flags=re.DOTALL)  # remove comments
-    content = re.sub(r">\s+<", "><", content)  # collapse whitespace between tags
-    content = re.sub(r"\s{2,}", " ", content)  # collapse remaining whitespace
-    return content.strip()
+def minify_css(content):
+    result = subprocess.run(
+        ["cleancss"],
+        input=content,
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode != 0:
+        print(f"  cleancss error: {result.stderr}", file=sys.stderr)
+        return content
+    return result.stdout
+
+
+def minify_js(content):
+    result = subprocess.run(
+        ["terser", "--compress", "--mangle"],
+        input=content,
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode != 0:
+        print(f"  terser error: {result.stderr}", file=sys.stderr)
+        return content
+    return result.stdout
+
+
+def minify_html(content):
+    # Extract and preserve <pre> and <code> blocks before minifying
+    preserved = {}
+
+    def preserve(match):
+        key = f"\x00PRESERVE{len(preserved)}\x00"
+        preserved[key] = match.group(0)
+        return key
+
+    content = re.sub(r"<pre[\s\S]*?</pre>", preserve, content, flags=re.IGNORECASE)
+    content = re.sub(r"<code[\s\S]*?</code>", preserve, content, flags=re.IGNORECASE)
+
+    # Minify everything else
+    content = re.sub(r"<!--.*?-->", "", content, flags=re.DOTALL)
+    content = " ".join(line.strip() for line in content.splitlines())
+    content = re.sub(r">\s+<", "><", content)
+    content = re.sub(r"\s{2,}", " ", content)
+    content = content.strip()
+
+    # Restore preserved blocks untouched
+    for key, value in preserved.items():
+        content = content.replace(key, value)
+
+    return content
+
+
+HANDLERS = {
+    ".css": minify_css,
+    ".js": minify_js,
+    ".html": minify_html,
+}
 
 
 def minify_files():
-    handlers = {
-        ".css": lambda c: rcssmin.cssmin(c),
-        ".js": lambda c: rjsmin.jsmin(c, keep_bang_comments=False),
-        ".html": minify_html_content,
-    }
     for file in DEPLOY_DIR.rglob("*"):
-        handler = handlers.get(file.suffix)
+        handler = HANDLERS.get(file.suffix)
         if not handler:
             continue
         content = file.read_text(encoding="utf-8")
diff --git a/requirements.txt b/requirements.txt
index aba80f0..351c3ca 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,8 +22,6 @@ pymdown-extensions==10.21
 python-dateutil==2.9.0.post0
 PyYAML==6.0.3
 pyyaml_env_tag==1.1
-rcssmin==1.2.2
-rjsmin==1.2.4
 six==1.17.0
 watchdog==6.0.0
 zensical==0.0.27