diff --git a/CHANGELOG.md b/CHANGELOG.md
index 239b1d6d795f1e0a4d077bb7ef8da2e3b071cb3d..cf84200730d38876c5ab74d05d4a6295a5364afd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,15 @@ Don’t forget to tag @ https://git.fitko.de/fit-connect/submission-api/-/tags
 
 ## Unreleased
 
+## [1.12.0]
+
+### Added
+
+- Erlaubt das Ãœbertragen des optionalen Felds `region` bei `POST /v1/submissions`. Diese Erweiterung erlaubt es Anbindern,
+  den amtlichen Regionalschlüssel (ARS) zusätzlich zu übertragen. Das optionale Feld wird, falls gesetzt, entsprechend
+  auch bei `POST /v1/submissions`, `PUT /v1/submissions/{submissionId}` und `GET /v1/submissions/{submissionId}`
+  im Response-Body zurückgegeben ([planning#2515](https://git.fitko.de/fit-connect/planning/-/issues/2515)).
+
 ## [1.11.0]
 
 ### Added
diff --git a/spec/schemas/create-submission.yaml b/spec/schemas/create-submission.yaml
index 659c32b923f50d23c2a4b43c5058213c02242b91..f8ed5397ebec06814d69cc83907e774b7814e672 100644
--- a/spec/schemas/create-submission.yaml
+++ b/spec/schemas/create-submission.yaml
@@ -32,5 +32,7 @@ properties:
       Wird eine bestehende Vorgangsreferenz angegeben, so wird innerhalb eines bestehenden Vorgangs eine neue Einreichung erstellt (Reply).
   serviceType:
     $ref: './service-type-post.yaml'
+  region:
+    $ref: './service-region.yaml'
   callback:
     $ref: './create-callback.yaml'
diff --git a/spec/schemas/submission-created.yaml b/spec/schemas/submission-created.yaml
index 3b0cfbbea381340e3bfaf813512c3ee14f013803..17fc91f3cacaca93bc15254879dcf92db2f049bc 100644
--- a/spec/schemas/submission-created.yaml
+++ b/spec/schemas/submission-created.yaml
@@ -24,3 +24,5 @@ properties:
       maxLength: 36
   serviceType:
     $ref: './service-type-get.yaml'
+  region:
+    $ref: './service-region.yaml'
diff --git a/spec/schemas/submission-reduced.yaml b/spec/schemas/submission-reduced.yaml
index 48b5adc88d001b55a810d46cafc05880fff30b90..1715756362b73ee2086efaee56aedcc40ddad580 100644
--- a/spec/schemas/submission-reduced.yaml
+++ b/spec/schemas/submission-reduced.yaml
@@ -36,5 +36,7 @@ properties:
       maxLength: 36
   serviceType:
     $ref: './service-type-get.yaml'
+  region:
+    $ref: './service-region.yaml'
   callback:
     $ref: './callback-url-deprecated.yaml'
diff --git a/spec/schemas/submission.yaml b/spec/schemas/submission.yaml
index 52d9405c2ef3094f4c315ab5548af7594804cbe6..e6a57df68f222e77243d682c191b63a0b4fbfcce 100644
--- a/spec/schemas/submission.yaml
+++ b/spec/schemas/submission.yaml
@@ -37,6 +37,8 @@ properties:
       maxLength: 36
   serviceType:
     $ref: './service-type-get.yaml'
+  region:
+    $ref: './service-region.yaml'
   callback:
     $ref: './callback-url-deprecated.yaml'
   encryptedMetadata: