diff --git a/pom.xml b/pom.xml
index 5dd93af..031e1d2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 	<groupId>fr.insee.lunatic</groupId>
 	<artifactId>lunatic-model</artifactId>
 	<packaging>jar</packaging>
-	<version>5.11.0</version>
+	<version>5.12.0</version>
 	<name>Lunatic Model</name>
 	<description>Classes and converters for the Lunatic model</description>
 	<url>https://inseefr.github.io/Lunatic-Model/</url>
@@ -117,8 +117,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.14.0</version>
 				<configuration>
-					<source>17</source>
-					<target>17</target>
+					<source>21</source>
+					<target>21</target>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/src/main/java/fr/insee/lunatic/model/flat/PairwiseLinks.java b/src/main/java/fr/insee/lunatic/model/flat/PairwiseLinks.java
index c45ae83..7a47b11 100644
--- a/src/main/java/fr/insee/lunatic/model/flat/PairwiseLinks.java
+++ b/src/main/java/fr/insee/lunatic/model/flat/PairwiseLinks.java
@@ -21,21 +21,37 @@
         "bindingDependencies",
         "xAxisIterations",
         "yAxisIterations",
+        "sourceVariables",
         "components",
         "symLinks"
 })
 @Getter
 @Setter
-public class PairwiseLinks
-    extends ComponentType
-    implements ComponentNestingType
-{
+public class PairwiseLinks extends ComponentType implements ComponentNestingType {
+
+    /**
+     * Variables associated with the pairwise links component.
+     */
+    @Getter
+    @Setter
+    public static class SourceVariables {
+        /** Name variable name. */
+        private String name;
+        /** Gender variable name. */
+        private String gender;
+        /** Age variable name. */
+        private String age;
+    }
 
     @JsonProperty("xAxisIterations")
     protected LabelType xAxisIterations;
 
     @JsonProperty("yAxisIterations")
     protected LabelType yAxisIterations;
+
+    /** {@link SourceVariables} */
+    private SourceVariables sourceVariables;
+
     protected List<ComponentType> components;
     protected SymLinksType symLinks;
 
diff --git a/src/test/java/fr/insee/lunatic/conversion/CleaningSerializationTest.java b/src/test/java/fr/insee/lunatic/conversion/CleaningSerializationTest.java
index e5111a7..85fe837 100644
--- a/src/test/java/fr/insee/lunatic/conversion/CleaningSerializationTest.java
+++ b/src/test/java/fr/insee/lunatic/conversion/CleaningSerializationTest.java
@@ -45,8 +45,7 @@ class CleaningSerializationTest {
                    ]
                  }
                }
-             }
-             """;
+             }""";
 
     @Test
     void serializeCleaning() throws SerializationException, JSONException {
diff --git a/src/test/java/fr/insee/lunatic/conversion/PairwiseLinksSerializationTest.java b/src/test/java/fr/insee/lunatic/conversion/PairwiseLinksSerializationTest.java
new file mode 100644
index 0000000..5666545
--- /dev/null
+++ b/src/test/java/fr/insee/lunatic/conversion/PairwiseLinksSerializationTest.java
@@ -0,0 +1,46 @@
+package fr.insee.lunatic.conversion;
+
+import fr.insee.lunatic.exception.SerializationException;
+import fr.insee.lunatic.model.flat.PairwiseLinks;
+import fr.insee.lunatic.model.flat.Questionnaire;
+import org.json.JSONException;
+import org.junit.jupiter.api.Test;
+import org.skyscreamer.jsonassert.JSONAssert;
+import org.skyscreamer.jsonassert.JSONCompareMode;
+
+class PairwiseLinksSerializationTest {
+
+    @Test
+    void serializePairwiseLinks() throws SerializationException, JSONException {
+        //
+        Questionnaire questionnaire = new Questionnaire();
+        PairwiseLinks pairwiseLinks = new PairwiseLinks();
+        pairwiseLinks.setId("foo-id");
+        PairwiseLinks.SourceVariables sourceVariables = new PairwiseLinks.SourceVariables();
+        sourceVariables.setName("FIRST_NAME_VAR");
+        sourceVariables.setGender("GENDER_VAR");
+        pairwiseLinks.setSourceVariables(sourceVariables);
+        questionnaire.getComponents().add(pairwiseLinks);
+        //
+        String result = new JsonSerializer().serialize(questionnaire);
+        //
+        String expected = """
+{
+  "componentType": "Questionnaire",
+  "components": [
+    {
+      "id": "foo-id",
+      "componentType": "PairwiseLinks",
+      "sourceVariables": {
+        "name": "FIRST_NAME_VAR",
+        "gender": "GENDER_VAR"
+      },
+      "components": []
+    }
+  ]
+}
+""";
+        JSONAssert.assertEquals(expected, result, JSONCompareMode.STRICT);
+    }
+
+}