diff --git a/bom/pom.xml b/bom/pom.xml
index 28998d455a..ada240719b 100644
--- a/bom/pom.xml
+++ b/bom/pom.xml
@@ -103,7 +103,7 @@ THE SOFTWARE.
       <dependency>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId>
-        <version>1.4.19</version>
+        <version>1.4.20</version>
       </dependency>
       <dependency>
         <groupId>commons-beanutils</groupId>
diff --git a/core/src/main/java/hudson/util/XStream2.java b/core/src/main/java/hudson/util/XStream2.java
index d56537d20f..4e6a9f035d 100644
--- a/core/src/main/java/hudson/util/XStream2.java
+++ b/core/src/main/java/hudson/util/XStream2.java
@@ -83,7 +83,6 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 import jenkins.model.Jenkins;
 import jenkins.util.SystemProperties;
-import jenkins.util.xstream.AtomicBooleanConverter;
 import jenkins.util.xstream.SafeURLConverter;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
@@ -274,7 +273,6 @@ public class XStream2 extends XStream {
         // http://www.openwall.com/lists/oss-security/2017/04/03/4
         denyTypes(new Class[] { void.class, Void.class });
 
-        registerConverter(new AtomicBooleanConverter(), 10);
         registerConverter(new RobustCollectionConverter(getMapper(), getReflectionProvider()), 10);
         registerConverter(new RobustMapConverter(getMapper()), 10);
         registerConverter(new ImmutableMapConverter(getMapper(), getReflectionProvider()), 10);
diff --git a/core/src/main/java/jenkins/util/xstream/AtomicBooleanConverter.java b/core/src/main/java/jenkins/util/xstream/AtomicBooleanConverter.java
deleted file mode 100644
index ef958d2c11..0000000000
--- a/core/src/main/java/jenkins/util/xstream/AtomicBooleanConverter.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package jenkins.util.xstream;
-
-import com.thoughtworks.xstream.converters.Converter;
-import com.thoughtworks.xstream.converters.MarshallingContext;
-import com.thoughtworks.xstream.converters.SingleValueConverterWrapper;
-import com.thoughtworks.xstream.converters.UnmarshallingContext;
-import com.thoughtworks.xstream.converters.basic.BooleanConverter;
-import com.thoughtworks.xstream.io.HierarchicalStreamReader;
-import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
-import java.util.concurrent.atomic.AtomicBoolean;
-import org.kohsuke.accmod.Restricted;
-import org.kohsuke.accmod.restrictions.NoExternalUse;
-
-/** Converts an {@link AtomicBoolean}. */
-@Restricted(NoExternalUse.class)
-public class AtomicBooleanConverter implements Converter {
-
-    @Override
-    public boolean canConvert(Class type) {
-        return type != null && AtomicBoolean.class.isAssignableFrom(type);
-    }
-
-    @Override
-    public void marshal(
-            Object source, HierarchicalStreamWriter writer, MarshallingContext context) {
-        final AtomicBoolean atomicBoolean = (AtomicBoolean) source;
-        writer.startNode("value");
-        context.convertAnother(
-                atomicBoolean.get(), new SingleValueConverterWrapper(BooleanConverter.BINARY));
-        writer.endNode();
-    }
-
-    @Override
-    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
-        reader.moveDown();
-        Object item =
-                context.convertAnother(
-                        null,
-                        Boolean.class,
-                        new SingleValueConverterWrapper(BooleanConverter.BINARY));
-        boolean value = item instanceof Boolean ? ((Boolean) item).booleanValue() : false;
-        reader.moveUp();
-        return new AtomicBoolean(value);
-    }
-}
diff --git a/core/src/test/java/jenkins/util/xstream/AtomicBooleanFieldsTest.java b/core/src/test/java/jenkins/util/xstream/AtomicBooleanFieldsTest.java
deleted file mode 100644
index b7b7c7eefb..0000000000
--- a/core/src/test/java/jenkins/util/xstream/AtomicBooleanFieldsTest.java
+++ /dev/null
@@ -1,69 +0,0 @@
-package jenkins.util.xstream;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-
-import com.thoughtworks.xstream.io.binary.BinaryStreamReader;
-import com.thoughtworks.xstream.io.binary.BinaryStreamWriter;
-import hudson.util.XStream2;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.concurrent.atomic.AtomicBoolean;
-import org.junit.Test;
-
-public class AtomicBooleanFieldsTest {
-
-    public static class Musican {
-        public String name;
-        public String genre;
-        public AtomicBoolean alive;
-
-        public Musican(final String name, final String genre, final AtomicBoolean alive) {
-            this.name = name;
-            this.genre = genre;
-            this.alive = alive;
-        }
-    }
-
-    @Test
-    public void testAtomicBooleanFields() {
-        List<Musican> jazzIcons = new ArrayList<>();
-        jazzIcons.add(new Musican("Miles Davis", "jazz", new AtomicBoolean(false)));
-        jazzIcons.add(new Musican("Wynton Marsalis", "jazz", new AtomicBoolean(true)));
-
-        XStream2 xstream = new XStream2();
-        xstream.alias("musician", Musican.class);
-
-        String xmlString = xstream.toXML(jazzIcons);
-        assertEquals(
-                "<list>\n"
-                        + "  <musician>\n"
-                        + "    <name>Miles Davis</name>\n"
-                        + "    <genre>jazz</genre>\n"
-                        + "    <alive>\n"
-                        + "      <value>0</value>\n"
-                        + "    </alive>\n"
-                        + "  </musician>\n"
-                        + "  <musician>\n"
-                        + "    <name>Wynton Marsalis</name>\n"
-                        + "    <genre>jazz</genre>\n"
-                        + "    <alive>\n"
-                        + "      <value>1</value>\n"
-                        + "    </alive>\n"
-                        + "  </musician>\n"
-                        + "</list>",
-                xmlString);
-        List<Musican> obj = (List<Musican>) xstream.fromXML(xmlString);
-        assertNotNull(obj);
-        assertEquals(xstream.toXML(jazzIcons), xstream.toXML(obj));
-
-        ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        xstream.marshal(jazzIcons, new BinaryStreamWriter(baos));
-        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
-        obj = (List<Musican>) xstream.unmarshal(new BinaryStreamReader(bais));
-        assertNotNull(obj);
-        assertEquals(xstream.toXML(jazzIcons), xstream.toXML(obj));
-    }
-}