diff --git a/.scalafix.conf b/.scalafix.conf
index 5bc5b4e..0a711f8 100644
--- a/.scalafix.conf
+++ b/.scalafix.conf
@@ -1,8 +1,5 @@
 rules=[
-    ExplicitResultTypes,
-    RemoveUnused,
     DisableSyntax,
     LeakingImplicitClassVal,
     NoValInForComprehension,
-    ProcedureSyntax
 ]
diff --git a/.scalafmt.conf b/.scalafmt.conf
index 9567408..79c162d 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,3 +1,3 @@
 version="3.3.1" 
 maxColumn = 120
-runner.dialect = scala213source3
+runner.dialect = scala3
diff --git a/build.sbt b/build.sbt
index a0313f0..f95d684 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,25 +2,24 @@ lazy val root = (project in file(".")).settings(
   inThisBuild(
     List(
       organization := "com.example",
-      scalaVersion := "2.13.7",
+      scalaVersion := "3.1.0",
       version := "0.1.0-SNAPSHOT",
       semanticdbEnabled := true,
       semanticdbVersion := scalafixSemanticdb.revision,
-      scalafixScalaBinaryVersion := "2.13"
+
+      // This is apparently not supported on Scala 3 currently
+      // scalafixScalaBinaryVersion := "3.1"
     )
   ),
   name := "LibreCaptcha",
   libraryDependencies += "com.sksamuel.scrimage" % "scrimage-core" % "4.0.24",
   libraryDependencies += "com.sksamuel.scrimage" % "scrimage-filters" % "4.0.24",
-  libraryDependencies += "org.json4s" % "json4s-jackson_2.13" % "4.0.3"
+  libraryDependencies += "org.json4s" %% "json4s-jackson" % "4.0.3"
 )
 
 Compile / unmanagedResourceDirectories += { baseDirectory.value / "lib" }
 scalacOptions ++= List(
-  "-Yrangepos",
-  "-Ywarn-unused",
   "-deprecation",
-  "-Xsource:3"
 )
 javacOptions += "-g:none"
 compileOrder := CompileOrder.JavaThenScala
diff --git a/src/main/scala/lc/core/config.scala b/src/main/scala/lc/core/config.scala
index 83d84e3..cee03a4 100644
--- a/src/main/scala/lc/core/config.scala
+++ b/src/main/scala/lc/core/config.scala
@@ -4,6 +4,9 @@ import scala.io.Source.fromFile
 import org.json4s.{DefaultFormats, JValue, JObject, JField, JString}
 import org.json4s.jackson.JsonMethods.{parse, render, pretty}
 import org.json4s.JsonDSL._
+import org.json4s.StringInput
+import org.json4s.jvalue2monadic
+import org.json4s.jvalue2extractable
 import java.io.{FileNotFoundException, File, PrintWriter}
 import java.{util => ju}
 import lc.misc.HelperFunctions
diff --git a/src/main/scala/lc/server/Server.scala b/src/main/scala/lc/server/Server.scala
index 5134373..54af9b7 100644
--- a/src/main/scala/lc/server/Server.scala
+++ b/src/main/scala/lc/server/Server.scala
@@ -1,6 +1,7 @@
 package lc.server
 
 import org.json4s.jackson.JsonMethods.parse
+import org.json4s.jvalue2extractable
 import lc.core.Captcha
 import lc.core.ErrorMessageEnum
 import lc.core.{Answer, ByteConvert, Error, Id, Parameters}
diff --git a/tests/run.sh b/tests/run.sh
index b26a54b..badfafb 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -4,7 +4,7 @@ python3 -m venv testEnv
 source ./testEnv/bin/activate
 pip install locust
 mkdir -p data/
-java -jar target/scala-2.13/LibreCaptcha.jar &
+java -jar target/scala-3.1.0/LibreCaptcha.jar &
 JAVA_PID=$!
 sleep 4
 
@@ -22,7 +22,7 @@ echo Run functional test
 cp data/config.json data/config.json.bak
 cp tests/debug-config.json data/config.json
 
-java -jar target/scala-2.13/LibreCaptcha.jar &
+java -jar target/scala-3.1.0/LibreCaptcha.jar &
 JAVA_PID=$!
 sleep 4