diff --git a/src/actions/build.ts b/src/actions/build.ts
index fa9cd48..809293d 100644
--- a/src/actions/build.ts
+++ b/src/actions/build.ts
@@ -3,7 +3,7 @@ import getAllFiles from "../utils/getAllFiles.js"
 import buildSource from "./processes/buildSource.js"
 import buildDefinitions from "./processes/buildDefinitions.js"
 
-const build = () => {
+const build = async () => {
   if (fs.existsSync("dist")) {
     console.log("Removing old build...")
     fs.rmSync("dist", { recursive: true })
@@ -12,7 +12,7 @@ const build = () => {
 
   const files = getAllFiles("src")
 
-  buildSource(files, false)
+  await buildSource(files, false)
   buildDefinitions()
 }
 
diff --git a/src/actions/dev.ts b/src/actions/dev.ts
index 91e8741..3f314e1 100644
--- a/src/actions/dev.ts
+++ b/src/actions/dev.ts
@@ -137,7 +137,7 @@ const send = async (config: Config, dayNum: number, part: 1 | 2) => {
   return false
 }
 
-const dev = (dayRaw: string | undefined) => {
+const dev = async (dayRaw: string | undefined) => {
   const day = dayRaw && (dayRaw.match(/\d+/) ?? [])[0]
   const config = readConfig()
 
@@ -184,12 +184,12 @@ const dev = (dayRaw: string | undefined) => {
   const files = getAllFiles("src")
 
   if (config.language === "ts") {
-    buildSource(files)
+    await buildSource(files)
   }
 
   runSolution(dayNum, indexFile)
 
-  const reload = (file: string) => {
+  const reload = async (file: string) => {
     if (![".js", ".ts", ".mjs"].includes(path.parse(file).ext)) {
       return
     }
@@ -197,7 +197,7 @@ const dev = (dayRaw: string | undefined) => {
     console.clear()
 
     if (config.language === "ts") {
-      buildSource(file)
+      await buildSource(file)
     }
 
     runSolution(dayNum, indexFile)
diff --git a/src/actions/processes/buildSource.ts b/src/actions/processes/buildSource.ts
index 23e26e6..4bc8a18 100644
--- a/src/actions/processes/buildSource.ts
+++ b/src/actions/processes/buildSource.ts
@@ -1,7 +1,10 @@
-import { spawnSync } from "child_process"
+import * as esbuild from "esbuild"
 import path from "path"
 
-const buildSource = (input: string | string[], sourcemap: boolean = true) => {
+const buildSource = async (
+  input: string | string[],
+  sourcemap: boolean = true,
+) => {
   const files = Array.isArray(input) ? input : [input]
   const outDir = Array.isArray(input)
     ? "dist"
@@ -9,19 +12,19 @@ const buildSource = (input: string | string[], sourcemap: boolean = true) => {
 
   console.log("Transpiling...\n")
 
-  spawnSync(
-    "npx",
-    [
-      "esbuild",
-      ...files,
-      "--format=esm",
-      `--outdir=${outDir}`,
-      "--platform=node",
-      "--target=node16",
-      ...(sourcemap ? ["--sourcemap"] : []),
-    ],
-    { stdio: "inherit", shell: true },
-  )
+  try {
+    await esbuild.build({
+      entryPoints: files,
+      format: "esm",
+      outdir: outDir,
+      platform: "node",
+      target: "node16",
+      sourcemap: sourcemap,
+    })
+  } catch (error) {
+    console.error("Build failed:", error)
+    process.exit(1)
+  }
 }
 
 export default buildSource
diff --git a/src/cli.ts b/src/cli.ts
index e17e8ed..506185b 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -29,11 +29,11 @@ switch (String(command || "").toLowerCase()) {
     break
   }
   case "day": {
-    dev(args[0])
+    await dev(args[0])
     break
   }
   case "build": {
-    build()
+    await build()
     break
   }
   case "update:readme": {
diff --git a/tsconfig.json b/tsconfig.json
index d3fef03..e0766f0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
-    "target": "es2020",
-    "module": "es2020",
+    "target": "es2022",
+    "module": "es2022",
     "removeComments": true,
     "declaration": true,
     "outDir": "node_modules/aocrunner/lib",