--- a/scripts/update-unicode-ids.ts
+++ b/scripts/update-unicode-ids.ts
@@ -1,8 +1,8 @@
 import fs from "fs"
-import http from "http"
+import readline from "readline"
 import { CLIEngine } from "eslint"
 
-const DB_URL = "http://unicode.org/Public/UNIDATA/DerivedCoreProperties.txt"
+const SRC_PATH = "/usr/share/unicode/DerivedCoreProperties.txt"
 const FILE_PATH = "src/unicode/ids.ts"
 const ID_START = /^([0-9a-z]+)(?:\.\.([0-9a-z]+))?[^;]*; ID_Start /iu
 const ID_CONTINUE = /^([0-9a-z]+)(?:\.\.([0-9a-z]+))?[^;]*; ID_Continue /iu
@@ -18,7 +18,7 @@
     const idContinueSmall: [number, number][] = []
     const idContinueLarge: [number, number][] = []
 
-    logger.log("Fetching data... (%s)", DB_URL)
+    logger.log("Fetching data... (%s)", SRC_PATH)
     await processEachLine(line => {
         let m: RegExpExecArray | null = null
         if (banner === "") {
@@ -125,29 +125,16 @@
 })
 
 function processEachLine(cb: (line: string) => void): Promise<void> {
+    const rl = readline.createInterface({
+        fs.createReadStream(SRC_PATH),
+        crlfDelay: Infinity
+    })
     return new Promise((resolve, reject) => {
-        http.get(DB_URL, res => {
-            let buffer = ""
-            res.setEncoding("utf8")
-            res.on("data", chunk => {
-                const lines = (buffer + String(chunk)).split("\n")
-                if (lines.length === 1) {
-                    buffer = lines[0]
-                } else {
-                    buffer = lines.pop()!
-                    for (const line of lines) {
-                        cb(line)
-                    }
-                }
-            })
-            res.on("end", () => {
-                if (buffer) {
-                    cb(buffer)
-                }
+        rl
+            .on("line", res => {
                 resolve()
             })
-            res.on("error", reject)
-        }).on("error", reject)
+            .on("error", reject)
     })
 }