diff --git a/aoc/src/dev/ctsk/aoc/Main.scala b/aoc/src/dev/ctsk/aoc/Main.scala
index a001965..da3c996 100644
--- a/aoc/src/dev/ctsk/aoc/Main.scala
+++ b/aoc/src/dev/ctsk/aoc/Main.scala
@@ -10,18 +10,26 @@ val solvers = Map[Int, Solver](
   5 -> Day05
 )
 
-@main def main(day: String, input: String): Unit =
-  solvers.get(day.toInt) match
-    case Some(solver) =>
-      val (timings, solution) = solver.run(os.pwd / input)
-      sys.env.get("AOC_BENCH") match
-        case Some(_) =>
-          println(solution.p1)
-          println(solution.p2)
-        case None =>
-          println(f"Preprocessing: ${timings.prep}%24s μs")
-          println(f"Part 1: ${solution.p1}%15s ${timings.p1}%15s μs")
-          println(f"Part 2: ${solution.p2}%15s ${timings.p2}%15s μs")
-
+def runSolver(solver: Solver, input: os.Path): Unit =
+  val (timings, solution) = solver.run(input)
+  sys.env.get("AOC_BENCH") match
+    case Some(_) =>
+      println(solution.p1)
+      println(solution.p2)
     case None =>
-      println(s"Day $day not solved")
+      println(f"Preprocessing: ${timings.prep}%24s μs")
+      println(f"Part 1: ${solution.p1}%15s ${timings.p1}%15s μs")
+      println(f"Part 2: ${solution.p2}%15s ${timings.p2}%15s μs")
+
+@main def main(day: String, input: String): Unit =
+  val num = """(\d+)""".r
+  day match
+    case "all" =>
+      solvers.foreach { case (day, solver) =>
+        runSolver(solver, os.pwd / os.RelPath(input) / f"$day%02d.in")
+      }
+    case num(_) =>
+      solvers.get(day.toInt) match
+        case Some(solver) => runSolver(solver, os.pwd / os.RelPath(input))
+        case None         => println(s"Day $day not solved")
+    case _ => println(day)
diff --git a/build.mill b/build.mill
index 5c55d8b..99ae93f 100644
--- a/build.mill
+++ b/build.mill
@@ -4,7 +4,7 @@ import mill._, scalalib._
 
 object aoc extends ScalaModule {
   def scalaVersion = "3.5.2"
-  // def ivyDeps = Agg(
-  //   ivy"org.scala-lang.modules::scala-parallel-collections:1.0.4"
-  // )
+  def ivyDeps = Agg(
+    ivy"com.lihaoyi::os-lib:0.11.3"
+  )
 }
\ No newline at end of file