diff --git a/build.sbt b/build.sbt
index ead95e4d..6097df5e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,7 +5,7 @@ val macrosParadiseVersion = "2.1.1"
 
 ThisBuild / versionScheme := Some("semver-spec")
 ThisBuild / organization := "com.github.sbt"
-ThisBuild / scalacOptions ++= Seq("-deprecation", "-feature")
+ThisBuild / scalacOptions ++= Seq("-deprecation", "-feature", "-Xfatal-warnings")
 ThisBuild / licenses := Seq(("BSD New", url("http://opensource.org/licenses/BSD-3-Clause")))
 ThisBuild / homepage := Some(url("https://github.com/jodersky/sbt-jni"))
 ThisBuild / developers := List(
diff --git a/core/src/main/scala-2/com/github/sbt/jni/Process.scala b/core/src/main/scala-2/com/github/sbt/jni/Process.scala
deleted file mode 100644
index 220ff800..00000000
--- a/core/src/main/scala-2/com/github/sbt/jni/Process.scala
+++ /dev/null
@@ -1,10 +0,0 @@
-package com.github.sbt.jni
-
-object Process {
-  def out(command: String): String =
-    try {
-      scala.sys.process.Process("uname -sm").lineStream.head
-    } catch {
-      case ex: Exception => sys.error("Error running `uname` command")
-    }
-}
diff --git a/core/src/main/scala-2/com/github/sbt/jni/annotations.scala b/core/src/main/scala-2/com/github/sbt/jni/annotations.scala
index 215dc2e3..eb13f51c 100644
--- a/core/src/main/scala-2/com/github/sbt/jni/annotations.scala
+++ b/core/src/main/scala-2/com/github/sbt/jni/annotations.scala
@@ -44,9 +44,9 @@ class nativeLoaderAnnotationMacro(val c: Context) {
               val tmp: Path = Files.createTempDirectory("jni-")
               val plat: String = {
                 val line = try {
-                  scala.sys.process.Process("uname -sm").lineStream.head
+                  scala.sys.process.Process("uname -sm").!!.linesIterator.next()
                 } catch {
-                  case ex: Exception => sys.error("Error running `uname` command")
+                  case _: Exception => sys.error("Error running `uname` command")
                 }
                 val parts = line.split(" ")
                 if (parts.length != 2) {
@@ -80,7 +80,7 @@ class nativeLoaderAnnotationMacro(val c: Context) {
             def load(): Unit = try {
               System.loadLibrary($nativeLibrary)
             } catch {
-              case ex: UnsatisfiedLinkError => loadPackaged()
+              case _: UnsatisfiedLinkError => loadPackaged()
             }
 
             load()
diff --git a/core/src/main/scala-3/com/github/sbt/jni/Process.scala b/core/src/main/scala-3/com/github/sbt/jni/Process.scala
deleted file mode 100644
index 581c4406..00000000
--- a/core/src/main/scala-3/com/github/sbt/jni/Process.scala
+++ /dev/null
@@ -1,10 +0,0 @@
-package com.github.sbt.jni
-
-object Process {
-  def out(command: String): String =
-    try {
-      scala.sys.process.Process("uname -sm").lazyLines.head
-    } catch {
-      case ex: Exception => sys.error("Error running `uname` command")
-    }
-}
diff --git a/core/src/main/scala/com/github/sbt/jni/syntax/NativeLoader.scala b/core/src/main/scala/com/github/sbt/jni/syntax/NativeLoader.scala
index 26ae126a..ac7e92bf 100644
--- a/core/src/main/scala/com/github/sbt/jni/syntax/NativeLoader.scala
+++ b/core/src/main/scala/com/github/sbt/jni/syntax/NativeLoader.scala
@@ -1,7 +1,5 @@
 package com.github.sbt.jni.syntax
 
-import com.github.sbt.jni.Process
-
 import java.nio.file.{Files, Path}
 
 class NativeLoader(nativeLibrary: String) {
@@ -16,7 +14,12 @@ object NativeLoader {
 
       val tmp: Path = Files.createTempDirectory("jni-")
       val plat: String = {
-        val line = Process.out("uname -sm")
+        val line =
+          try {
+            scala.sys.process.Process("uname -sm").!!.linesIterator.next()
+          } catch {
+            case _: Exception => sys.error("Error running `uname` command")
+          }
         val parts = line.split(" ")
         if (parts.length != 2) {
           sys.error("Could not determine platform: 'uname -sm' returned unexpected string: " + line)
@@ -50,7 +53,7 @@ object NativeLoader {
     def load(): Unit = try {
       System.loadLibrary(nativeLibrary)
     } catch {
-      case ex: UnsatisfiedLinkError => loadPackaged()
+      case _: UnsatisfiedLinkError => loadPackaged()
     }
 
     load()
diff --git a/plugin/src/main/scala/com/github/sbt/jni/plugins/JniNative.scala b/plugin/src/main/scala/com/github/sbt/jni/plugins/JniNative.scala
index 4cddf0dd..ccbd1db9 100644
--- a/plugin/src/main/scala/com/github/sbt/jni/plugins/JniNative.scala
+++ b/plugin/src/main/scala/com/github/sbt/jni/plugins/JniNative.scala
@@ -53,7 +53,7 @@ object JniNative extends AutoPlugin {
           arch + "-" + kernel
         }
       } catch {
-        case ex: Exception =>
+        case _: Exception =>
           sLog.value.error("Error trying to determine platform.")
           sLog.value.warn("Cannot determine platform! It will be set to 'unknown'.")
           "unknown-unknown"