diff --git a/docs/docs/getting-started/what's-new.md b/docs/docs/getting-started/what's-new.md
index 14e2bfc26..494be367c 100644
--- a/docs/docs/getting-started/what's-new.md
+++ b/docs/docs/getting-started/what's-new.md
@@ -7,6 +7,27 @@ next: /docs/config-overview/
 
 _NotifyBC_ uses [semantic versioning](https://semver.org/).
 
+## v5.0.0
+
+See [Upgrade Guide](../upgrade/#v4-to-v5) for more information.
+
+- Runs on _Nest_
+
+::: tip Why v5?
+_NotifyBC_ was built on Node.js [LoopBack](https://loopback.io/) in the beginning. While _Loopback_ is an awesome framework, it is evident by 2022 _Loopback_ is no longer actively maintained
+
+1. features such as GraphQL have been in experimental state for years
+2. recent commits are mostly chores rather than enhancements
+3. core developers have ceased to contribute
+
+To pave the way for future growth, switching platform becomes necessary. Nest was chosen because
+
+1. both _Nest_ and _Loopback_ are server-side Node.js frameworks
+2. _Nest_ has the closest feature set as _Loopback_. To a large extent _Nest_ is a superset of _Loopback_.
+3. _Nest_ incorporates more technologies
+
+:::
+
 ## v4.1.0
 
 - Issue [#50](https://github.com/bcgov/NotifyBC/issues/50): Email message throttle
@@ -84,15 +105,15 @@ See [v2 to v3 upgrade guide](../upgrade/#v2-to-v3) for more information.
 - misc web console adjustments
 - docs updates
 
-::: tip Why v2?
-_NotifyBC_ has been built on Node.js [LoopBack](https://loopback.io/) framework since 2017. LoopBack v4, which was released in 2019, is backward incompatible. To keep software stack up-to-date, unless rewriting from scratch, it is necessary to port _NotifyBC_ to LoopBack v4. Great care has been taken to minimize upgrade effort.
-:::
-
 ## v2.0.0
 
-See [Upgrade Guide](../upgrade/) for more information.
+See [Upgrade Guide](../upgrade/#v1-to-v2) for more information.
 
 - Runs on LoopBack v4
 - All code is converted to TypeScript
 - Upgraded [OAS](https://swagger.io/specification/) from v2 to v3
 - Docs is converted from Jekyll to VuePress
+
+::: tip Why v2?
+_NotifyBC_ has been built on Node.js [LoopBack](https://loopback.io/) framework since 2016. LoopBack v4, which was released in 2019, is backward incompatible. To keep software stack up-to-date, unless rewriting from scratch, it is necessary to port _NotifyBC_ to LoopBack v4. Great care has been taken to minimize upgrade effort.
+:::
diff --git a/docs/docs/meta/acknowledgments.md b/docs/docs/meta/acknowledgments.md
index b5652021b..b16c33ff9 100644
--- a/docs/docs/meta/acknowledgments.md
+++ b/docs/docs/meta/acknowledgments.md
@@ -8,7 +8,7 @@ _NotifyBC_ is built on a myriad of open source software. At runtime it also depe
 few services. Credit goes to their contributors. Notably
 
 - [Node.js](https://nodejs.org/)
-- [Loopback](https://loopback.io/)
+- [Nest](https://nestjs.com/)
 - [MongoDB](https://www.mongodb.com/)
 - [NodeMailer](https://nodemailer.com/)
 - [JMESPath](https://jmespath.org/)
diff --git a/docs/docs/miscellaneous/upgrade.md b/docs/docs/miscellaneous/upgrade.md
index 26d32912b..9acd1fede 100644
--- a/docs/docs/miscellaneous/upgrade.md
+++ b/docs/docs/miscellaneous/upgrade.md
@@ -267,7 +267,7 @@ Replace _v4.x.x_ with a v4 release, preferably latest, found in GitHub such as _
 
 ## v4 to v5
 
-v5 introduced following backward incompatible changes that need to be addressed in this order
+v5 introduced following backward incompatible changes
 
 1. If you use default in-memory database, data in _server/database/data.json_ will not be migrated automatically. Manually migrate if necessary.
 2. Update file _src/datasources/db.datasource.local.json_
@@ -293,6 +293,23 @@ v5 introduced following backward incompatible changes that need to be addressed
    }
    ```
 
+3. API querying operators have changed. Replace following [Loopback operators](https://loopback.io/doc/en/lb4/Where-filter.html#operators) with corresponding [MongoDB operators](https://www.mongodb.com/docs/manual/reference/operator/query/) at client-side API call.
+
+| Loopback operators      | MongoDB operators                               |
+| ----------------------- | ----------------------------------------------- |
+| eq                      | $eq                                             |
+| and                     | $and                                            |
+| or                      | $or                                             |
+| gt, gte                 | $gt, $gte                                       |
+| lt, lte                 | $lt, $lte                                       |
+| between                 | (no equivalent, replace with $gt, $and and $lt) |
+| inq, nin                | $in, $nin                                       |
+| near                    | $near                                           |
+| neq                     | $ne                                             |
+| like, nlike             | (replace with $regexp)                          |
+| like, nlike, options: i | (replace with $regexp)                          |
+| regexp                  | $regexp                                         |
+
 After above changes are addressed, upgrading to v5 is as simple as
 
 ```sh