diff --git a/build.sbt b/build.sbt
index 223b4bb8..c2a75c47 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,5 +1,5 @@
 // Default scala used for day-to-day dev / IDE
-val devScala = "3.6.4"
+val devScala = "3.4.1"
 
 // During IntelliJ import (VM option -DIDEA_IMPORT=1), expose only Scala 3 to the IDE.
 // From the CLI (no IDEA_IMPORT prop), keep the full cross set for + / ++.
@@ -8,7 +8,7 @@ ThisBuild / crossScalaVersions := {
   if (sys.props.get("IDEA_IMPORT").contains("1"))
     Seq(devScala)
   else {
-    Seq(devScala, "3.4.1", "2.11.12", "2.12.20", "2.13.14")
+    Seq(devScala, "3.6.4", "2.11.12", "2.12.20", "2.13.14")
   }
 }
 
@@ -52,6 +52,10 @@ lazy val commonScalaSettings = Seq(
   scalaVersion       := (ThisBuild / scalaVersion).value,
   crossScalaVersions := (ThisBuild / crossScalaVersions).value,
 
+  // Scala 3 versions share the same _3 artifact coordinates. Test all versions,
+  // but publish only the baseline compiler's artifacts for consumer compatibility.
+  publish / skip := scalaBinaryVersion.value == "3" && scalaVersion.value != devScala,
+
   // Version-specific support directories
   Compile / unmanagedSourceDirectories ++= {
     val base = (Compile / sourceDirectory).value