diff --git a/build.sbt b/build.sbt
index 8e9c302..c1c6034 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,5 +1,5 @@
 lazy val scala2 = "2.13.16"
-lazy val scala3 = "3.4.2"
+lazy val scala3 = "3.8.4"
 lazy val supportedScalaVersions = List(scala2, scala3)
 
 name := "apibuilder-validation"
@@ -10,7 +10,7 @@ ThisBuild / scalaVersion := scala3
 
 lazy val allScalacOptions = Seq(
   "-feature",
-  "-Xfatal-warnings",
+  "-Werror",
   "-Wconf:src=generated/.*:silent",
   "-deprecation"
 )
@@ -29,7 +29,7 @@ lazy val root = project
       "com.github.apicollective" % "apibuilder-commons" % (if (scalaVersion.value.startsWith("3")) "0.1.0" else "0.0.6"),
       "com.typesafe.play" %% "play-json" % (if (scalaVersion.value.startsWith("3")) "2.10.6" else "2.9.4"),
       "com.typesafe.play" %% "play-json-joda" % (if (scalaVersion.value.startsWith("3")) "2.10.6" else "2.9.4"),
-      "org.apache.commons" % "commons-compress" % "1.26.2",
+      "org.apache.commons" % "commons-compress" % "1.28.0",
       "org.typelevel" %% "cats-core" % "2.12.0",
       "org.scalatest" %% "scalatest" % "3.2.19" % Test,
     ),
diff --git a/project/build.properties b/project/build.properties
index 8fdecc2..7ed9916 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1,3 +1,3 @@
-sbt.version=1.10.0
+sbt.version=1.12.11
 
 
diff --git a/src/main/scala/io/apibuilder/validation/util/UrlDownloader.scala b/src/main/scala/io/apibuilder/validation/util/UrlDownloader.scala
index 86b7ec0..82dd94b 100644
--- a/src/main/scala/io/apibuilder/validation/util/UrlDownloader.scala
+++ b/src/main/scala/io/apibuilder/validation/util/UrlDownloader.scala
@@ -1,7 +1,7 @@
 package io.apibuilder.validation.util
 
 import java.io.{BufferedInputStream, InputStream}
-import java.net.URL
+import java.net.{URI, URL}
 
 import cats.data.ValidatedNec
 import cats.implicits._
@@ -11,7 +11,7 @@ import scala.util.{Failure, Success, Try}
 object ValidatedUrlDownloader {
   def validateUrl(url: String): ValidatedNec[String, URL] = {
     Try {
-      new URL(url)
+      new URI(url).toURL
     } match {
       case Success(u) => u.validNec
       case Failure(ex) => s"Invalid URL: ${ex.getMessage}".invalidNec