diff --git a/Readme.md b/Readme.md
index 2cb79ea4003f835fd1931fa8ad902f05a7aa8ce9..e646df034d732e8e705aa25901573e203a9d45f1 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,6 +1,6 @@
 # NFV SOL012 - OpenAPIs for the Policy Management Interface
 
-This repository contains OpenAPIs for ETSI GS NFV-SOL 012 v4.5.1, RESTful protocols 
+This repository contains OpenAPIs for ETSI GS NFV-SOL 012 v5.3.1, RESTful protocols 
 specification for the Policy Management Interface.
 
 More information at [NFV Solutions wiki](https://nfvwiki.etsi.org/index.php?title=NFV_Solutions).
diff --git a/src/SOL012/APIVersion/APIVersion.yaml b/src/SOL012/APIVersion/APIVersion.yaml
index acbd4d6e8facb67a010023276184a46b85d69c7d..c6e67c03414e6ab129cc6ce8dc47bc42109745d9 100644
--- a/src/SOL012/APIVersion/APIVersion.yaml
+++ b/src/SOL012/APIVersion/APIVersion.yaml
@@ -23,8 +23,8 @@ info:
     name: NFV-SOL WG
 
 externalDocs:
-  description: ETSI GS NFV-SOL 012 v4.4.1
-  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/012/04.04.01_60/gs_NFV-SOL012v040401p.pdf
+  description: ETSI GS NFV-SOL 012 v5.3.1
+  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/012/05.03.01_60/gs_NFV-SOL012v050301p.pdf
 
 paths:
   /nfvpolicy/api_versions:
diff --git a/src/SOL012/PolicyManagement/PolicyManagement.yaml b/src/SOL012/PolicyManagement/PolicyManagement.yaml
index 34a548f9cd357717b441fed5cf926779b1d30c62..abe41a7205d54b6b638eae2c6059605a34bb2d03 100644
--- a/src/SOL012/PolicyManagement/PolicyManagement.yaml
+++ b/src/SOL012/PolicyManagement/PolicyManagement.yaml
@@ -15,8 +15,8 @@ info:
     name: ETSI Forge copyright notice
     url: https://forge.etsi.org/etsi-forge-copyright-notice.txt
 externalDocs:
-  description: ETSI GS NFV-SOL 012 v4.5.1
-  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/012/04.05.01_60/gs_NFV-SOL012v040501p.pdf
+  description: ETSI GS NFV-SOL 012 v5.3.1
+  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/012/05.03.01_60/gs_NFV-SOL012v050301p.pdf
 
 security:
   - OauthSecurity:
diff --git a/src/SOL012/PolicyManagementNotification/PolicyManagementNotification.yaml b/src/SOL012/PolicyManagementNotification/PolicyManagementNotification.yaml
index 1754b4aadbdef9710e98f30dae5f13061109b0cf..26549501e9d376769078529ead20c745a6951833 100644
--- a/src/SOL012/PolicyManagementNotification/PolicyManagementNotification.yaml
+++ b/src/SOL012/PolicyManagementNotification/PolicyManagementNotification.yaml
@@ -15,8 +15,8 @@ info:
     name: ETSI Forge copyright notice
     url: https://forge.etsi.org/etsi-forge-copyright-notice.txt
 externalDocs:
-  description: ETSI GS NFV-SOL 012 v4.5.1
-  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/012/04.05.01_60/gs_NFV-SOL012v040501p.pdf
+  description: ETSI GS NFV-SOL 012 v5.3.1
+  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/012/05.03.01_60/gs_NFV-SOL012v050301p.pdf
 
 security:
   - OauthSecurity: