diff --git a/README.md b/README.md
index 52ce26e97..5464380e0 100644
--- a/README.md
+++ b/README.md
@@ -26,19 +26,19 @@ For people that want to skip the explanations and see it action, this is the pla
 ### Dependency Configuration
 
 ```scala
-libraryDependencies += "com.outr" %% "scribe" % "3.12.1"
+libraryDependencies += "com.outr" %% "scribe" % "3.12.2"
 ```
 
 For Cross-Platform projects (JVM, JS, and/or Native):
 
 ```scala
-libraryDependencies += "com.outr" %%% "scribe" % "3.12.1"
+libraryDependencies += "com.outr" %%% "scribe" % "3.12.2"
 ```
 
 Or, if you want interoperability with SLF4J (to allow better interoperability with existing libraries using other loggers):
 
 ```scala
-libraryDependencies += "com.outr" %% "scribe-slf4j" % "3.12.1"
+libraryDependencies += "com.outr" %% "scribe-slf4j" % "3.12.2"
 ```
 
 ### Usage
diff --git a/build.sbt b/build.sbt
index 7aaccb449..9c45293eb 100644
--- a/build.sbt
+++ b/build.sbt
@@ -9,7 +9,7 @@ val allScalaVersions = List(scala213, scala212, scala3)
 
 name := "scribe"
 ThisBuild / organization := "com.outr"
-ThisBuild / version := "3.12.1"
+ThisBuild / version := "3.12.2"
 ThisBuild / scalaVersion := scala213
 ThisBuild / scalacOptions ++= Seq("-unchecked", "-deprecation")
 ThisBuild / javacOptions ++= Seq("-source", "1.8", "-target", "1.8")
diff --git a/core/shared/src/main/scala/scribe/mdc/MDCMap.scala b/core/shared/src/main/scala/scribe/mdc/MDCMap.scala
index c9ec47abe..e00dcd291 100644
--- a/core/shared/src/main/scala/scribe/mdc/MDCMap.scala
+++ b/core/shared/src/main/scala/scribe/mdc/MDCMap.scala
@@ -3,14 +3,17 @@ package scribe.mdc
 import scribe.util.Time
 import perfolation._
 
+import java.util.concurrent.ConcurrentHashMap
+import scala.jdk.CollectionConverters._
+
 class MDCMap(parent: Option[MDC]) extends MDC {
-  private var _map: Map[String, () => Any] = Map.empty
+  private val _map = new ConcurrentHashMap[String, () => Any]
 
-  override def map: Map[String, () => Any] = _map
+  override def map: Map[String, () => Any] = _map.asScala.toMap
 
-  override def get(key: String): Option[() => Any] = _map.get(key).orElse(parent.flatMap(_.get(key)))
+  override def get(key: String): Option[() => Any] = Option(_map.get(key)).orElse(parent.flatMap(_.get(key)))
 
-  override def update(key: String, value: => Any): Unit = _map = _map + (key -> (() => value))
+  override def update(key: String, value: => Any): Unit = _map.put(key, () => value)
 
   override def contextualize[Return](key: String, value: => Any)(f: => Return): Return = {
     update(key, value)
@@ -26,9 +29,9 @@ class MDCMap(parent: Option[MDC]) extends MDC {
     update(key, s"${((timeFunction() - start) / 1000.0).f()}s")
   }
 
-  override def remove(key: String): Unit = _map = _map - key
+  override def remove(key: String): Unit = _map.remove(key)
 
   override def contains(key: String): Boolean = map.contains(key)
 
-  override def clear(): Unit = _map = Map.empty
+  override def clear(): Unit = _map.clear()
 }
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