diff --git a/core/server/data/migrations/versions/4.46/2022-04-27-08-16-drop-nullable-subscribe-event-newsletter-id.js b/core/server/data/migrations/versions/4.46/2022-04-27-08-16-drop-nullable-subscribe-event-newsletter-id.js
new file mode 100644
index 0000000000..38b3fd215c
--- /dev/null
+++ b/core/server/data/migrations/versions/4.46/2022-04-27-08-16-drop-nullable-subscribe-event-newsletter-id.js
@@ -0,0 +1,3 @@
+const {createDropNullableMigration} = require('../../utils');
+
+module.exports = createDropNullableMigration('members_subscribe_events', 'newsletter_id');
diff --git a/core/server/data/schema/schema.js b/core/server/data/schema/schema.js
index 927c7447ad..9bf7928892 100644
--- a/core/server/data/schema/schema.js
+++ b/core/server/data/schema/schema.js
@@ -601,7 +601,7 @@ module.exports = {
         subscribed: {type: 'bool', nullable: false, defaultTo: true},
         created_at: {type: 'dateTime', nullable: false},
         source: {type: 'string', maxlength: 50, nullable: true},
-        newsletter_id: {type: 'string', maxlength: 24, nullable: true, references: 'newsletters.id', cascadeDelete: false}
+        newsletter_id: {type: 'string', maxlength: 24, nullable: false, references: 'newsletters.id', cascadeDelete: false}
     },
     stripe_products: {
         id: {type: 'string', maxlength: 24, nullable: false, primary: true},
diff --git a/test/unit/server/data/schema/integrity.test.js b/test/unit/server/data/schema/integrity.test.js
index dd85085af8..729960412b 100644
--- a/test/unit/server/data/schema/integrity.test.js
+++ b/test/unit/server/data/schema/integrity.test.js
@@ -35,7 +35,7 @@ const validateRouteSettings = require('../../../../../core/server/services/route
  */
 describe('DB version integrity', function () {
     // Only these variables should need updating
-    const currentSchemaHash = 'cad4a9890ab928de593e4c682a2cd326';
+    const currentSchemaHash = '2524eac55c153eca7ee300e094fbd3fe';
     const currentFixturesHash = '4924616fbc51dd0ccef62ae04b4708f9';
     const currentSettingsHash = 'ffd899a82b0ad2886e92d8244bcbca6a';
     const currentRoutesHash = '3d180d52c663d173a6be791ef411ed01';