diff --git a/build.sbt b/build.sbt
index 591b02d1f..0dc52aefe 100644
--- a/build.sbt
+++ b/build.sbt
@@ -99,6 +99,10 @@ lazy val lmCore = (project in file("core"))
         )
       )
       .taskValue,
+    Compile / scalacOptions ++= (scalaVersion.value match {
+      case v if v.startsWith("2.12.") => List("-Ywarn-unused:-locals,-explicits,-privates")
+      case _                          => List()
+    }),
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",
diff --git a/core/src/main/contraband-scala/sbt/librarymanagement/ArtifactTypeFilter.scala b/core/src/main/contraband-scala/sbt/librarymanagement/ArtifactTypeFilter.scala
index fa68be8f1..ce5ab7765 100644
--- a/core/src/main/contraband-scala/sbt/librarymanagement/ArtifactTypeFilter.scala
+++ b/core/src/main/contraband-scala/sbt/librarymanagement/ArtifactTypeFilter.scala
@@ -4,15 +4,15 @@
 
 // DO NOT EDIT MANUALLY
 package sbt.librarymanagement
-/** Work around the inadequacy of Ivy's ArtifactTypeFilter (that it cannot reverse a filter) */
+/**
+ * Work around the inadequacy of Ivy's ArtifactTypeFilter (that it cannot reverse a filter)
+ * @param types Represents the artifact types that we should try to resolve for (as in the allowed values of
+                `artifact[type]` from a dependency `<publications>` section). One can use this to filter
+                source / doc artifacts.
+ * @param inverted Whether to invert the types filter (i.e. allow only types NOT in the set)
+ */
 final class ArtifactTypeFilter private (
-  /**
-   * Represents the artifact types that we should try to resolve for (as in the allowed values of
-   * `artifact[type]` from a dependency `<publications>` section). One can use this to filter
-   * source / doc artifacts.
-   */
   val types: Set[String],
-  /** Whether to invert the types filter (i.e. allow only types NOT in the set) */
   val inverted: Boolean) extends sbt.librarymanagement.ArtifactTypeFilterExtra with Serializable {
   
   
diff --git a/core/src/main/contraband-scala/sbt/librarymanagement/ConfigRef.scala b/core/src/main/contraband-scala/sbt/librarymanagement/ConfigRef.scala
index 30cba07f5..f956602f6 100644
--- a/core/src/main/contraband-scala/sbt/librarymanagement/ConfigRef.scala
+++ b/core/src/main/contraband-scala/sbt/librarymanagement/ConfigRef.scala
@@ -4,9 +4,11 @@
 
 // DO NOT EDIT MANUALLY
 package sbt.librarymanagement
-/** A reference to Configuration. */
+/**
+ * A reference to Configuration.
+ * @param name The name of the configuration that eventually get used by Maven.
+ */
 final class ConfigRef private (
-  /** The name of the configuration that eventually get used by Maven. */
   val name: String) extends Serializable {
   
   
diff --git a/core/src/main/contraband-scala/sbt/librarymanagement/ConfigurationReport.scala b/core/src/main/contraband-scala/sbt/librarymanagement/ConfigurationReport.scala
index 228a8fdbe..1243665a1 100644
--- a/core/src/main/contraband-scala/sbt/librarymanagement/ConfigurationReport.scala
+++ b/core/src/main/contraband-scala/sbt/librarymanagement/ConfigurationReport.scala
@@ -4,13 +4,15 @@
 
 // DO NOT EDIT MANUALLY
 package sbt.librarymanagement
-/** Provides information about resolution of a single configuration. */
+/**
+ * Provides information about resolution of a single configuration.
+ * @param configuration the configuration this report is for.
+ * @param modules a sequence containing one report for each module resolved for this configuration.
+ * @param details a sequence containing one report for each org/name, which may or may not be part of the final resolution.
+ */
 final class ConfigurationReport private (
-  /** the configuration this report is for. */
   val configuration: sbt.librarymanagement.ConfigRef,
-  /** a sequence containing one report for each module resolved for this configuration. */
   val modules: Vector[sbt.librarymanagement.ModuleReport],
-  /** a sequence containing one report for each org/name, which may or may not be part of the final resolution. */
   val details: Vector[sbt.librarymanagement.OrganizationArtifactReport]) extends sbt.librarymanagement.ConfigurationReportExtra with Serializable {
   
   
diff --git a/core/src/main/contraband-scala/sbt/librarymanagement/UpdateConfiguration.scala b/core/src/main/contraband-scala/sbt/librarymanagement/UpdateConfiguration.scala
index 533a24542..4443f1eb8 100644
--- a/core/src/main/contraband-scala/sbt/librarymanagement/UpdateConfiguration.scala
+++ b/core/src/main/contraband-scala/sbt/librarymanagement/UpdateConfiguration.scala
@@ -4,22 +4,20 @@
 
 // DO NOT EDIT MANUALLY
 package sbt.librarymanagement
+/**
+ * @param retrieveManaged If set to some RetrieveConfiguration, this enables retrieving dependencies to the specified directory.
+                          Otherwise, dependencies are used directly from the cache.
+ * @param missingOk If set to true, it ignores when artifacts are missing.
+                    This setting could be uses when retrieving source/javadocs jars opportunistically.
+ * @param logging Logging setting used specifially for library management.
+ * @param logicalClock The clock that may be used for caching.
+ * @param metadataDirectory The base directory that may be used to store metadata.
+ */
 final class UpdateConfiguration private (
-  /**
-   * If set to some RetrieveConfiguration, this enables retrieving dependencies to the specified directory.
-   * Otherwise, dependencies are used directly from the cache.
-   */
   val retrieveManaged: Option[sbt.librarymanagement.RetrieveConfiguration],
-  /**
-   * If set to true, it ignores when artifacts are missing.
-   * This setting could be uses when retrieving source/javadocs jars opportunistically.
-   */
   val missingOk: Boolean,
-  /** Logging setting used specifially for library management. */
   val logging: sbt.librarymanagement.UpdateLogging,
-  /** The clock that may be used for caching. */
   val logicalClock: sbt.librarymanagement.LogicalClock,
-  /** The base directory that may be used to store metadata. */
   val metadataDirectory: Option[java.io.File],
   val artifactFilter: Option[sbt.librarymanagement.ArtifactTypeFilter],
   val offline: Boolean,
diff --git a/core/src/main/contraband-scala/sbt/librarymanagement/UpdateReport.scala b/core/src/main/contraband-scala/sbt/librarymanagement/UpdateReport.scala
index 5ad396e00..ef6da3930 100644
--- a/core/src/main/contraband-scala/sbt/librarymanagement/UpdateReport.scala
+++ b/core/src/main/contraband-scala/sbt/librarymanagement/UpdateReport.scala
@@ -8,13 +8,13 @@ package sbt.librarymanagement
  * Provides information about dependency resolution.
  * It does not include information about evicted modules, only about the modules ultimately selected by the conflict manager.
  * This means that for a given configuration, there should only be one revision for a given organization and module name.
+ * @param cachedDescriptor the location of the resolved module descriptor in the cache
+ * @param configurations a sequence containing one report for each configuration resolved.
+ * @param stats stats information about the update that produced this report
  */
 final class UpdateReport private (
-  /** the location of the resolved module descriptor in the cache */
   val cachedDescriptor: java.io.File,
-  /** a sequence containing one report for each configuration resolved. */
   val configurations: Vector[sbt.librarymanagement.ConfigurationReport],
-  /** stats information about the update that produced this report */
   val stats: sbt.librarymanagement.UpdateStats,
   val stamps: Map[java.io.File, Long]) extends sbt.librarymanagement.UpdateReportExtra with Serializable {
   
diff --git a/ivy/src/main/java/internal/librarymanagement/JavaNetAuthenticator.java b/ivy/src/main/java/internal/librarymanagement/JavaNetAuthenticator.java
index 10a0e6285..aa10461cc 100644
--- a/ivy/src/main/java/internal/librarymanagement/JavaNetAuthenticator.java
+++ b/ivy/src/main/java/internal/librarymanagement/JavaNetAuthenticator.java
@@ -31,9 +31,9 @@ import okhttp3.Challenge;
 import okhttp3.Credentials;
 
 /**
- * Adapts {@link java.net.Authenticator} to {@link Authenticator}. Configure OkHttp to use {@link
- * java.net.Authenticator} with {@link OkHttpClient.Builder#authenticator} or {@link
- * OkHttpClient.Builder#proxyAuthenticator(Authenticator)}.
+ * Adapts java.net.Authenticator to Authenticator. Configure OkHttp to use 
+ * java.net.Authenticator with OkHttpClient.Builder#authenticator or 
+ * OkHttpClient.Builder#proxyAuthenticator(Authenticator).
  */
 public final class JavaNetAuthenticator implements Authenticator {
   @Override public Request authenticate(Route route, Response response) throws IOException {
diff --git a/ivy/src/main/scala/sbt/internal/librarymanagement/IvyActions.scala b/ivy/src/main/scala/sbt/internal/librarymanagement/IvyActions.scala
index b30777a12..72a3490dd 100644
--- a/ivy/src/main/scala/sbt/internal/librarymanagement/IvyActions.scala
+++ b/ivy/src/main/scala/sbt/internal/librarymanagement/IvyActions.scala
@@ -26,8 +26,6 @@ import syntax._
 import InternalDefaults._
 import UpdateClassifiersUtil._
 
-import scala.util.Try
-
 object IvyActions {
 
   /** Installs the dependencies of the given 'module' from the resolver named 'from' to the resolver named 'to'.*/
diff --git a/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyDependencyResolution.scala b/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyDependencyResolution.scala
index fd0fd259c..2f4985c46 100644
--- a/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyDependencyResolution.scala
+++ b/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyDependencyResolution.scala
@@ -21,7 +21,7 @@ class IvyDependencyResolution private[sbt] (val ivySbt: IvySbt)
 
   private[sbt] def toModule(module: ModuleDescriptor): Module =
     module match {
-      case m: Module => m
+      case m: Module @unchecked => m
     }
 }
 
diff --git a/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyPublisher.scala b/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyPublisher.scala
index cc92e8bf9..8ae4a4481 100644
--- a/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyPublisher.scala
+++ b/ivy/src/main/scala/sbt/librarymanagement/ivy/IvyPublisher.scala
@@ -25,7 +25,7 @@ class IvyPublisher private[sbt] (val ivySbt: IvySbt) extends PublisherInterface
 
   private[sbt] def toModule(module: ModuleDescriptor): Module =
     module match {
-      case m: Module => m
+      case m: Module @unchecked => m
     }
 }
 
diff --git a/project/build.properties b/project/build.properties
index d6e35076c..0cd8b0798 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.1.6
+sbt.version=1.2.3
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 32f478494..335c8fb18 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,5 +1,5 @@
-addSbtPlugin("org.scala-sbt" % "sbt-houserules"  % "0.3.7")
-addSbtPlugin("org.scala-sbt" % "sbt-contraband"  % "0.4.0")
+addSbtPlugin("org.scala-sbt" % "sbt-houserules"  % "0.3.8")
+addSbtPlugin("org.scala-sbt" % "sbt-contraband"  % "0.4.1")
 addSbtPlugin("com.lightbend" % "sbt-whitesource" % "0.1.9")
 
 scalacOptions += "-language:postfixOps"