diff --git a/crates/aoc_wasm/web/index.html b/crates/aoc_wasm/web/index.html
index b9d9f38..9bc0ca8 100644
--- a/crates/aoc_wasm/web/index.html
+++ b/crates/aoc_wasm/web/index.html
@@ -60,9 +60,9 @@
         }
     </style>
     <script src="web.mjs" type="module"></script>
-    <link rel="modulepreload" href="aoc.mjs" />
-    <link rel="modulepreload" href="worker.mjs" />
-    <link rel="preload" href="aoc_wasm.wasm" as="fetch" crossorigin />
+    <link rel="modulepreload" href="./aoc.mjs" />
+    <link rel="modulepreload" href="./worker.mjs" />
+    <link rel="preload" href="./aoc.wasm" as="fetch" crossorigin />
 </head>
 <body class="is-flex is-flex-direction-column">
     <nav class="navbar" role="navigation" aria-label="main navigation">
diff --git a/crates/aoc_wasm/web/web.mjs b/crates/aoc_wasm/web/web.mjs
index 9370b51..d06e85f 100644
--- a/crates/aoc_wasm/web/web.mjs
+++ b/crates/aoc_wasm/web/web.mjs
@@ -1,7 +1,7 @@
 import {Aoc} from "./aoc.mjs";
 
-const module = await WebAssembly.compileStreaming(fetch("aoc_wasm.wasm"));
-const worker = new Worker("worker.mjs", {type: "module"});
+const module = await WebAssembly.compileStreaming(fetch("./aoc.wasm"));
+const worker = new Worker("./worker.mjs", {type: "module"});
 worker.postMessage(["init", module]);
 
 const puzzles = Aoc.puzzleList(module);
diff --git a/crates/xtask/src/cmd/web.rs b/crates/xtask/src/cmd/web.rs
index 59ec8c5..1826ce5 100644
--- a/crates/xtask/src/cmd/web.rs
+++ b/crates/xtask/src/cmd/web.rs
@@ -1,5 +1,11 @@
-use crate::common::{copy_dir, copy_file, delete_dir, repo_dir_path, run_cargo};
+use crate::common::{
+    copy_dir, copy_file, create_dir, delete_dir, repo_dir_path, run_cargo, write_file,
+};
 use std::error::Error;
+use std::fs;
+use std::path::Path;
+use std::str;
+use utils::md5;
 
 pub fn main(args: impl Iterator<Item = String>) -> Result<(), Box<dyn Error>> {
     crate::ensure_no_args(args)?;
@@ -23,18 +29,39 @@ pub fn main(args: impl Iterator<Item = String>) -> Result<(), Box<dyn Error>> {
         "--release",
     ])?;
 
-    copy_dir(
-        repo_dir_path().join("crates").join("aoc_wasm").join("web"),
-        &output,
-    )?;
+    create_dir(&output)?;
+
+    let output_wasm = output.join("aoc.wasm");
     copy_file(
         repo_dir_path()
             .join("target")
             .join("wasm32-unknown-unknown")
             .join("release")
             .join("aoc_wasm.wasm"),
-        output.join("aoc_wasm.wasm"),
+        &output_wasm,
     )?;
+
+    let mut rewrites = vec![];
+    add_rewrite(&mut rewrites, &output_wasm)?;
+
+    let web = repo_dir_path().join("crates").join("aoc_wasm").join("web");
+    for file in ["aoc.mjs", "worker.mjs", "web.mjs", "index.html"] {
+        let src = web.join(file);
+        let dst = output.join(file);
+
+        let mut contents = fs::read_to_string(src)?;
+        for (from, to) in &rewrites {
+            let len = contents.len();
+            contents = contents.replace(from, to);
+            if len != contents.len() {
+                println!("rewritten {from} to {to} in {file}");
+            }
+        }
+        write_file(&dst, contents.as_bytes())?;
+
+        add_rewrite(&mut rewrites, &dst)?;
+    }
+
     copy_dir(
         repo_dir_path().join("target").join("doc"),
         output.join("doc"),
@@ -42,3 +69,18 @@ pub fn main(args: impl Iterator<Item = String>) -> Result<(), Box<dyn Error>> {
 
     Ok(())
 }
+
+fn add_rewrite(rewrites: &mut Vec<(String, String)>, path: &Path) -> Result<(), Box<dyn Error>> {
+    let bytes = fs::read(path)?;
+    let hash_hex = md5::to_hex(md5::hash(&bytes));
+    let hex_str = str::from_utf8(&hash_hex)?;
+
+    let Some(file_name) = path.file_name().and_then(|x| x.to_str()) else {
+        return Err("invalid file name".into());
+    };
+    let from = format!("\"./{file_name}\"");
+    let to = format!("\"./{file_name}?hash={hex_str}\"");
+    rewrites.push((from, to));
+
+    Ok(())
+}
