diff --git a/maven.yaml b/maven.yaml
index 40e1b1d..d470ac0 100644
--- a/maven.yaml
+++ b/maven.yaml
@@ -509,6 +509,11 @@ data:
                     Runtime dependency of maven, xmvn.
                     Build dependency of maven, maven-resolver,
                          plexus-languages, sisu, testng.
+            # groovy18-1.8.9-30
+            groovy18:
+                ref: 0da485c
+                rationale: >
+                    Build dependency of jackson.
             # guava-18.0-11.fc28.1
             guava:
                 ref: 69c77c2