diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index ee3e7edc9..225987832 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -14,7 +14,7 @@ object Dependencies {
   // sbt modules
   private val ioVersion = nightlyVersion.getOrElse("1.5.0-M1")
   private val lmVersion =
-    sys.props.get("sbt.build.lm.version").orElse(nightlyVersion).getOrElse("1.5.0-M4")
+    sys.props.get("sbt.build.lm.version").orElse(nightlyVersion).getOrElse("1.5.0-M5")
   val zincVersion = nightlyVersion.getOrElse("1.5.0-M3")
 
   private val sbtIO = "org.scala-sbt" %% "io" % ioVersion
diff --git a/sbt/src/sbt-test/actions/doc-scala3/build.sbt b/sbt/src/sbt-test/actions/doc-scala3/build.sbt
new file mode 100644
index 000000000..60e38b5ca
--- /dev/null
+++ b/sbt/src/sbt-test/actions/doc-scala3/build.sbt
@@ -0,0 +1,7 @@
+ThisBuild / scalaVersion := "3.0.0-M4-bin-20210212-0273336-NIGHTLY"
+// ThisBuild / scalaVersion := "3.0.0-M3",
+
+lazy val root = (project in file("."))
+  .settings(
+    resolvers += Resolver.JCenterRepository
+  )
diff --git a/sbt/src/sbt-test/actions/scala3-doc/src/main/scala/foo/A.scala b/sbt/src/sbt-test/actions/doc-scala3/src/main/scala/foo/A.scala
similarity index 100%
rename from sbt/src/sbt-test/actions/scala3-doc/src/main/scala/foo/A.scala
rename to sbt/src/sbt-test/actions/doc-scala3/src/main/scala/foo/A.scala
diff --git a/sbt/src/sbt-test/actions/doc-scala3/test b/sbt/src/sbt-test/actions/doc-scala3/test
new file mode 100644
index 000000000..20241bff4
--- /dev/null
+++ b/sbt/src/sbt-test/actions/doc-scala3/test
@@ -0,0 +1,17 @@
+> doc
+
+# there shouldn't be two api/ directories
+# see https://github.com/lampepfl/dotty/issues/11412
+$ exists target/scala-3.0.0-M4/api/api/index.html
+$ exists target/scala-3.0.0-M4/api/api/foo/A$.html
+$ exists target/scala-3.0.0-M4/api/api/foo.html
+
+> ++3.0.0-M3!
+> clean
+> doc
+
+# there shouldn't be two api/ directories
+# see https://github.com/lampepfl/dotty/issues/11412
+$ exists target/scala-3.0.0-M3/api/index.html
+$ exists target/scala-3.0.0-M3/api/api/foo/A$.html
+$ exists target/scala-3.0.0-M3/api/api/foo.html
diff --git a/sbt/src/sbt-test/actions/scala3-doc/build.sbt b/sbt/src/sbt-test/actions/scala3-doc/build.sbt
deleted file mode 100644
index 9718f87b7..000000000
--- a/sbt/src/sbt-test/actions/scala3-doc/build.sbt
+++ /dev/null
@@ -1,5 +0,0 @@
-lazy val root = (project in file("."))
-  .settings(
-    scalaVersion := "3.0.0-M3",
-    resolvers += Resolver.JCenterRepository
-  )
diff --git a/sbt/src/sbt-test/actions/scala3-doc/test b/sbt/src/sbt-test/actions/scala3-doc/test
deleted file mode 100644
index a6edd4dc0..000000000
--- a/sbt/src/sbt-test/actions/scala3-doc/test
+++ /dev/null
@@ -1,4 +0,0 @@
-> doc
-$ exists target/scala-3.0.0-M3/api/index.html
-$ exists target/scala-3.0.0-M3/api/api/foo/A$.html
-$ exists target/scala-3.0.0-M3/api/api/foo.html
\ No newline at end of file