diff --git a/part-13/build.gradle b/part-13/build.gradle
index 92abe3e1..34f6fda4 100644
--- a/part-13/build.gradle
+++ b/part-13/build.gradle
@@ -6,7 +6,6 @@ plugins {
 dependencies {
     antlr "org.antlr:antlr4:$antlr_version"
     implementation "org.graalvm.js:js:$graal_version"
-    implementation "org.graalvm.truffle:truffle-sl:$graal_version"
     implementation "org.graalvm.tools:profiler:$graal_version"
     implementation "org.apache.commons:commons-text:1.10.0"
 }
diff --git a/part-13/src/jmh/java/com/endoflineblog/truffle/part_13/CounterThisBenchmark.java b/part-13/src/jmh/java/com/endoflineblog/truffle/part_13/CounterThisBenchmark.java
index 88b8406b..a3f7bde2 100644
--- a/part-13/src/jmh/java/com/endoflineblog/truffle/part_13/CounterThisBenchmark.java
+++ b/part-13/src/jmh/java/com/endoflineblog/truffle/part_13/CounterThisBenchmark.java
@@ -24,18 +24,6 @@ public void setup() {
 
         this.truffleContext.eval("js", COUNTER_CLASS);
         this.truffleContext.eval("js", COUNT_WITH_THIS_IN_FOR);
-
-        this.truffleContext.eval("sl", "" +
-                "function countWithThisInFor(n) { " +
-                "    counter = new(); " +
-                "    i = 1; " +
-                "    while (i <= n) { " +
-                "        counter.count = i; " +
-                "        i = i + 1; " +
-                "    } " +
-                "    return counter.count; " +
-                "}"
-        );
     }
 
     private static final String COUNT_WITH_THIS_IN_FOR = "" +
@@ -56,13 +44,4 @@ public int count_with_this_in_for_ezs() {
     public int count_with_this_in_for_js() {
         return this.truffleContext.eval("js", "countWithThisInFor(" + INPUT + ");").asInt();
     }
-
-    @Benchmark
-    public int count_with_this_in_for_sl() {
-        return this.truffleContext.eval("sl", "" +
-                "function main() { " +
-                "    return countWithThisInFor(" + INPUT + ");" +
-                "}"
-        ).asInt();
-    }
 }
diff --git a/part-13/src/test/java/com/endoflineblog/truffle/part_13/FieldsTest.java b/part-13/src/test/java/com/endoflineblog/truffle/part_13/FieldsTest.java
index 33600938..1327b20b 100644
--- a/part-13/src/test/java/com/endoflineblog/truffle/part_13/FieldsTest.java
+++ b/part-13/src/test/java/com/endoflineblog/truffle/part_13/FieldsTest.java
@@ -187,26 +187,4 @@ public void benchmark_returns_its_input() {
         );
         assertEquals(input, result.asInt());
     }
-
-    @Test
-    public void simplelang_benchmark_returns_its_input() {
-        var input = 100;
-        this.context.eval("sl", "" +
-                "function countWithThisInFor(n) { " +
-                "    counter = new(); " +
-                "    i = 1; " +
-                "    while (i <= n) { " +
-                "        counter.count = i; " +
-                "        i = i + 1; " +
-                "    } " +
-                "    return counter.count; " +
-                "}");
-
-        Value result = this.context.eval("sl", "" +
-                "function main() { " +
-                "    return countWithThisInFor(" + input + ");" +
-                "}"
-        );
-        assertEquals(input, result.asInt());
-    }
 }