diff --git a/forward_engineering/alterScript/alterScriptFromDeltaHelper.js b/forward_engineering/alterScript/alterScriptFromDeltaHelper.js
index cd50926..ad1cd34 100644
--- a/forward_engineering/alterScript/alterScriptFromDeltaHelper.js
+++ b/forward_engineering/alterScript/alterScriptFromDeltaHelper.js
@@ -127,9 +127,9 @@ const getAlterCollectionsScriptDtos = ({
 		...createCollectionsScriptDtos,
 		...deleteCollectionScriptDtos,
 		...addColumnScriptDtos,
-		...modifyCollectionScriptDtos,
 		...deleteColumnScriptDtos,
 		...modifyColumnScriptDtos,
+		...modifyCollectionScriptDtos,
 	].filter(Boolean);
 };
 
diff --git a/forward_engineering/alterScript/alterScriptHelpers/alterEntityHelper.js b/forward_engineering/alterScript/alterScriptHelpers/alterEntityHelper.js
index 90d82a6..67cafe4 100644
--- a/forward_engineering/alterScript/alterScriptHelpers/alterEntityHelper.js
+++ b/forward_engineering/alterScript/alterScriptHelpers/alterEntityHelper.js
@@ -11,6 +11,7 @@ const {
 const { getModifyCheckConstraintScriptDtos } = require('./entityHelpers/checkConstraintHelper');
 const { getModifyPkConstraintsScriptDtos } = require('./entityHelpers/primaryKeyHelper');
 const { getModifyUniqueKeyConstraintsScriptDtos } = require('./entityHelpers/uniqueKeyHelper');
+const { getModifyNonNullColumnsScriptDtos } = require('./columnHelpers/nonNullConstraintHelper');
 
 /**
  * @return {(collection: AlterCollectionDto) => AlterScriptDto | undefined}
@@ -205,8 +206,9 @@ const getModifyColumnScriptDtos = (app, dbVersion, scriptFormat) => collection =
 
 	const renameColumnScriptDtos = getRenameColumnScriptDtos(ddlProvider, scriptFormat)(collection);
 	const updateTypeScriptDtos = getUpdateTypesScriptDtos(ddlProvider, scriptFormat)(collection);
+	const modifyNotNullScriptDtos = getModifyNonNullColumnsScriptDtos({ scriptFormat, collection });
 
-	return [...renameColumnScriptDtos, ...updateTypeScriptDtos].filter(Boolean);
+	return [...renameColumnScriptDtos, ...updateTypeScriptDtos, ...modifyNotNullScriptDtos].filter(Boolean);
 };
 
 module.exports = {
diff --git a/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js b/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js
new file mode 100644
index 0000000..c640033
--- /dev/null
+++ b/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js
@@ -0,0 +1,56 @@
+const _ = require('lodash');
+const { AlterScriptDto } = require('../../types/AlterScriptDto');
+const { assignTemplates } = require('../../../utils/assignTemplates');
+const templates = require('../../../ddlProvider/templates');
+const {
+	wrapInQuotes,
+	getSchemaOfAlterCollection,
+	getFullCollectionName,
+	prepareNameForScriptFormat,
+} = require('../../../utils/general');
+
+/**
+ * @param {string} tableName
+ * @param {string} columnName
+ * @return {string}
+ * */
+const setNotNullConstraint = (tableName, columnName) => {
+	return assignTemplates(templates.addNotNullConstraint, {
+		tableName,
+		columnName,
+	});
+};
+
+/**
+ * @param {object} params
+ * @property {string} [scriptFormat]
+ * @property {AlterCollectionDto} collection
+ * @return {AlterScriptDto[]}
+ * */
+const getModifyNonNullColumnsScriptDtos = ({ scriptFormat, collection }) => {
+	const prepareName = prepareNameForScriptFormat(scriptFormat);
+	const collectionSchema = getSchemaOfAlterCollection(collection);
+	const fullTableName = getFullCollectionName(scriptFormat)(collectionSchema);
+
+	const currentRequiredColumnNames = collection.required || [];
+	const previousRequiredColumnNames = collection.role.required || [];
+
+	const columnNamesToAddNotNullConstraint = _.difference(currentRequiredColumnNames, previousRequiredColumnNames);
+	const columnNamesToRemoveNotNullConstraint = _.difference(previousRequiredColumnNames, currentRequiredColumnNames);
+
+	const addNotNullConstraintsScript = _.toPairs(collection.properties)
+		.filter(([name, jsonSchema]) => {
+			const oldName = jsonSchema.compMod.oldField.name;
+			const shouldRemoveForOldName = columnNamesToRemoveNotNullConstraint.includes(oldName);
+			const shouldAddForNewName = columnNamesToAddNotNullConstraint.includes(name);
+			return shouldAddForNewName && !shouldRemoveForOldName;
+		})
+		.map(([columnName]) => setNotNullConstraint(fullTableName, prepareName(columnName)))
+		.map(script => AlterScriptDto.getInstance([script], true, false));
+
+	return addNotNullConstraintsScript;
+};
+
+module.exports = {
+	getModifyNonNullColumnsScriptDtos,
+};
diff --git a/forward_engineering/ddlProvider/templates.js b/forward_engineering/ddlProvider/templates.js
index 6fef063..7b2e5b6 100644
--- a/forward_engineering/ddlProvider/templates.js
+++ b/forward_engineering/ddlProvider/templates.js
@@ -79,4 +79,6 @@ module.exports = {
 	dropConstraint: 'ALTER TABLE ${tableName} DROP CONSTRAINT ${constraintName};',
 
 	addPkConstraint: 'ALTER TABLE ${tableName} ADD ${constraintStatement};',
+
+	addNotNullConstraint: 'ALTER TABLE ${tableName} MODIFY ${columnName} NOT NULL;',
 };