diff --git a/cc/src/main/grammars/de/monticore/lang/ComponentConnector.mc4 b/cc/src/main/grammars/de/monticore/lang/ComponentConnector.mc4
index 55af991a..13d85ddd 100644
--- a/cc/src/main/grammars/de/monticore/lang/ComponentConnector.mc4
+++ b/cc/src/main/grammars/de/monticore/lang/ComponentConnector.mc4
@@ -168,6 +168,8 @@ component grammar ComponentConnector
    ;
 
    symbolrule Requirement =
+      stateInvariant: boolean
+      subject:MildComponentSymbol
       assumptions:Expression*
       guarantee:Expression
    ;
diff --git a/cc/src/main/java/de/monticore/lang/componentconnector/_symboltable/RequirementSymbolDeSer.java b/cc/src/main/java/de/monticore/lang/componentconnector/_symboltable/RequirementSymbolDeSer.java
index d85afdc8..bda64393 100644
--- a/cc/src/main/java/de/monticore/lang/componentconnector/_symboltable/RequirementSymbolDeSer.java
+++ b/cc/src/main/java/de/monticore/lang/componentconnector/_symboltable/RequirementSymbolDeSer.java
@@ -7,6 +7,12 @@
 
 public class RequirementSymbolDeSer extends RequirementSymbolDeSerTOP {
 
+  @Override
+  protected void serializeSubject(MildComponentSymbol subject,
+                                  ComponentConnectorSymbols2Json s2j) {
+    // not implemented
+  }
+
   @Override
   protected void serializeAssumptions(List<ASTExpression> assumptions,
                                       ComponentConnectorSymbols2Json s2j) {
@@ -19,6 +25,12 @@ protected void serializeGuarantee(ASTExpression guarantee,
     // not implemented
   }
 
+  @Override
+  protected MildComponentSymbol deserializeSubject(JsonObject symbolJson) {
+    // not implemented
+    return null;
+  }
+
   @Override
   protected List<ASTExpression> deserializeAssumptions(JsonObject symbolJson) {
     // not implemented
diff --git a/gradle.properties b/gradle.properties
index 2ab0ba49..f94cb124 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -25,4 +25,4 @@ assertj_version    = 3.21.0
 junit_version      = 5.8.2
 
 # Version of published artifacts
-version            = 7.8.30
+version            = 7.8.31