diff --git a/package.json b/package.json
index 88ef68d..df31e06 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "openchs-models",
     "description": "OpenCHS data model to be used by front end clients",
-    "version": "1.31.59",
+    "version": "1.31.60",
     "private": false,
     "repository": {
         "type": "git",
diff --git a/src/RuleDependency.js b/src/RuleDependency.js
index 0cbad8e..c0f0651 100644
--- a/src/RuleDependency.js
+++ b/src/RuleDependency.js
@@ -1,5 +1,6 @@
 import ReferenceEntity from "./ReferenceEntity";
 import General from "./utility/General";
+import _ from "lodash";
 
 class RuleDependency extends ReferenceEntity {
   static noop = "{}";
diff --git a/src/StandardReportCardType.js b/src/StandardReportCardType.js
index 0b8ea03..5c2d453 100644
--- a/src/StandardReportCardType.js
+++ b/src/StandardReportCardType.js
@@ -2,6 +2,7 @@ import BaseEntity from "./BaseEntity";
 import General from "./utility/General";
 import TaskType from "./task/TaskType";
 import ApprovalStatus from "./ApprovalStatus";
+import _ from "lodash";
 
 class StandardReportCardType extends BaseEntity {
     static schema = {
diff --git a/src/SubjectType.js b/src/SubjectType.js
index baf2a78..71d0940 100644
--- a/src/SubjectType.js
+++ b/src/SubjectType.js
@@ -3,6 +3,7 @@ import General from "./utility/General";
 import Format from "./application/Format";
 import ResourceUtil from "./utility/ResourceUtil";
 import SchemaNames from "./SchemaNames";
+import _ from "lodash";
 
 class SubjectType extends ReferenceEntity {
   static schema = {
diff --git a/src/draft/DraftSubject.js b/src/draft/DraftSubject.js
index a760fee..951cd7b 100644
--- a/src/draft/DraftSubject.js
+++ b/src/draft/DraftSubject.js
@@ -7,6 +7,7 @@ import AddressLevel from "../AddressLevel";
 import Observation from "../Observation";
 import Point from "../geo/Point";
 import SchemaNames from "../SchemaNames";
+import _ from "lodash";
 
 class DraftSubject extends BaseEntity {
   static schema = {