diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0a5a94a..414a076 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,6 @@ jobs:
       fail-fast: false
       matrix:
         java: [8, 11, 17, 21]
-        scala: [2.13.x, 2.12.x]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -21,4 +20,4 @@ jobs:
         java-version: ${{matrix.java}}
     - uses: sbt/setup-sbt@v1
     - name: Test
-      run: sbt ++${{matrix.scala}} test
+      run: sbt test
diff --git a/README.md b/README.md
index 6564e8c..a1ea4eb 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Sculpt: dependency graph extraction for Scala 2
 
 Sculpt is a compiler plugin for analyzing the dependency structure of
-Scala 2 source code.
+Scala 2.13 source code.
 
 ## Project status
 
@@ -11,9 +11,6 @@ useful to someone.
 
 Sculpt is NOT supported under the Akka subscription.
 
-Supported Scala versions are currently 2.13.x and 2.12.x.
-(2.12.x support is likely to be discontinued.)
-
 ## What is it for?
 
 The data generated by the plugin should be useful for all sorts of
diff --git a/build.sbt b/build.sbt
index fb574d3..e6d6e39 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,8 +5,7 @@ licenses := Seq(
   "Apache 2" -> url("http://www.apache.org/licenses/LICENSE-2.0.txt"))
 homepage := Some(url("http://github.com/lightbend/scala-sculpt"))
 
-scalaVersion := crossScalaVersions.value.head
-crossScalaVersions := Seq("2.13.16", "2.12.20")
+scalaVersion := "2.13.16"
 
 libraryDependencies ++= Seq(
   "org.scala-lang" % "scala-compiler" % scalaVersion.value % "provided",
diff --git a/src/test/scala/com/lightbend/tools/sculpt/IntegrationTest.scala b/src/test/scala/com/lightbend/tools/sculpt/IntegrationTest.scala
index 70d7962..5e51bdf 100644
--- a/src/test/scala/com/lightbend/tools/sculpt/IntegrationTest.scala
+++ b/src/test/scala/com/lightbend/tools/sculpt/IntegrationTest.scala
@@ -8,22 +8,10 @@ import scala.tools.nsc.{Global, Settings}
 
 object Scaffold {
 
-  val classes: String = {
-    // this will be e.g. "2.11" or "2.12"
-    val majorScalaVersion = {
-      val v = scala.util.Properties.versionNumberString
-      if (v matches ".*-(pre-\\w+|M\\d+|RC\\d+)") {
-        v
-      }
-      else {
-        v.split('.').take(2).mkString(".")
-      }
-    }
-    val relative = s"./target/scala-$majorScalaVersion/classes"
-    val file = new java.io.File(relative)
-    assert(file.exists)
-    file.getAbsolutePath
-  }
+  val classes: String =
+    new java.io.File("./target/scala-2.13/classes")
+      .ensuring(_.exists)
+      .getAbsolutePath
 
   def defaultSettings: Settings = {
     val settings = new Settings
diff --git a/src/test/scala/com/lightbend/tools/sculpt/Samples.scala b/src/test/scala/com/lightbend/tools/sculpt/Samples.scala
index c3b05b3..3e6f922 100644
--- a/src/test/scala/com/lightbend/tools/sculpt/Samples.scala
+++ b/src/test/scala/com/lightbend/tools/sculpt/Samples.scala
@@ -474,49 +474,45 @@ object Samples {
          |[0] tp:scala.AnyRef
          |""".stripMargin)
 
-  // test:runMain com.lightbend.tools.sculpt.Samples "pattern match" "object O { 0 match { case _ => () } }"
-  // we only run this on 2.13, because the results are different (and worse) on 2.12, as per
-  // https://github.com/lightbend/scala-sculpt/issues/28
-  if (!scala.util.Properties.versionNumberString.startsWith("2.12"))
-    Sample(
-      name = "pattern match",
-      source =
-        """|object O { 0 match { case _ => () } }""".stripMargin,
-      json =
-        """|[
-           |  {"extends": ["pkt:scala", "tp:AnyRef"], "sym": ["o:O"]},
-           |  {"sym": ["o:O", "def:<init>"], "uses": ["o:O"]},
-           |  {"sym": ["o:O", "def:<init>"], "uses": ["pkt:java", "pkt:lang", "cl:Object", "def:<init>"]}
-           |]""".stripMargin,
-      classJson =
-        """|[
-           |  {"sym": ["o:O"], "uses": ["pkt:java", "pkt:lang", "cl:Object"]},
-           |  {"sym": ["o:O"], "uses": ["pkt:scala", "tp:AnyRef"]}
-           |]""".stripMargin,
-      graph =
-        """|Graph 'pattern match': 4 nodes, 3 edges
-           |Nodes:
-           |  - o:O
-           |  - pkt:scala.tp:AnyRef
-           |  - o:O.def:<init>
-           |  - pkt:java.pkt:lang.cl:Object.def:<init>
-           |Edges:
-           |  - o:O -[Extends]-> pkt:scala.tp:AnyRef
-           |  - o:O.def:<init> -[Uses]-> o:O
-           |  - o:O.def:<init> -[Uses]-> pkt:java.pkt:lang.cl:Object.def:<init>""".stripMargin,
-      tree =
-        """|pattern match:
-           |└── O
-           |    └── scala.AnyRef
-           |└── scala.AnyRef
-           |""".stripMargin,
-      cycles =
-        """|""".stripMargin,
-      layers =
-        """|[1] o:O
-           |[0] cl:java.lang.Object
-           |[0] tp:scala.AnyRef
-           |""".stripMargin)
+  Sample(
+    name = "pattern match",
+    source =
+      """|object O { 0 match { case _ => () } }""".stripMargin,
+    json =
+      """|[
+         |  {"extends": ["pkt:scala", "tp:AnyRef"], "sym": ["o:O"]},
+         |  {"sym": ["o:O", "def:<init>"], "uses": ["o:O"]},
+         |  {"sym": ["o:O", "def:<init>"], "uses": ["pkt:java", "pkt:lang", "cl:Object", "def:<init>"]}
+         |]""".stripMargin,
+    classJson =
+      """|[
+         |  {"sym": ["o:O"], "uses": ["pkt:java", "pkt:lang", "cl:Object"]},
+         |  {"sym": ["o:O"], "uses": ["pkt:scala", "tp:AnyRef"]}
+         |]""".stripMargin,
+    graph =
+      """|Graph 'pattern match': 4 nodes, 3 edges
+         |Nodes:
+         |  - o:O
+         |  - pkt:scala.tp:AnyRef
+         |  - o:O.def:<init>
+         |  - pkt:java.pkt:lang.cl:Object.def:<init>
+         |Edges:
+         |  - o:O -[Extends]-> pkt:scala.tp:AnyRef
+         |  - o:O.def:<init> -[Uses]-> o:O
+         |  - o:O.def:<init> -[Uses]-> pkt:java.pkt:lang.cl:Object.def:<init>""".stripMargin,
+    tree =
+      """|pattern match:
+         |└── O
+         |    └── scala.AnyRef
+         |└── scala.AnyRef
+         |""".stripMargin,
+    cycles =
+      """|""".stripMargin,
+    layers =
+      """|[1] o:O
+         |[0] cl:java.lang.Object
+         |[0] tp:scala.AnyRef
+         |""".stripMargin)
 
   // this is the sample in the readme
   // test:runMain com.lightbend.tools.sculpt.Samples "readme" "object Dep1 { val x = 42; val y = Dep2.z }; object Dep2 { val z = Dep1.x }"