diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9fd79418..8e4f7364 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 * [#478](https://github.com/slack-ruby-client/pulls/478): Update API from [slack-api-ref@d797055](https://github.com/slack-ruby/slack-api-ref/commit/d797055) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#480](https://github.com/slack-ruby-client/pulls/480): Add common message formatting utilities - [@chrisbloom7](https://github.com/chrisbloom7).
 * [#481](https://github.com/slack-ruby-client/pulls/481): Update API from [slack-api-ref@7c22d0b](https://github.com/slack-ruby/slack-api-ref/commit/7c22d0b) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
+* [#488](https://github.com/slack-ruby-client/pulls/488): Update API from [slack-api-ref@a45def2](https://github.com/slack-ruby/slack-api-ref/commit/a45def2) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * Your contribution here.
 
 ### 2.1.0 (2023/03/17)
diff --git a/lib/slack/web/api/errors.rb b/lib/slack/web/api/errors.rb
index c785dcfe..5d3ff3fd 100644
--- a/lib/slack/web/api/errors.rb
+++ b/lib/slack/web/api/errors.rb
@@ -594,6 +594,7 @@ class UserIsRestricted < SlackError; end
         class UserIsUltraRestricted < SlackError; end
         class UserMustBeAdmin < SlackError; end
         class UserMustBeInWorkspace < SlackError; end
+        class UserNotAMemberOfThisWorkspace < SlackError; end
         class UserNotFound < SlackError; end
         class UserNotInChannel < SlackError; end
         class UserNotVisible < SlackError; end
@@ -1198,6 +1199,7 @@ class WorkflowsExportCsvNotEnabled < SlackError; end
           'user_is_ultra_restricted' => UserIsUltraRestricted,
           'user_must_be_admin' => UserMustBeAdmin,
           'user_must_be_in_workspace' => UserMustBeInWorkspace,
+          'user_not_a_member_of_this_workspace' => UserNotAMemberOfThisWorkspace,
           'user_not_found' => UserNotFound,
           'user_not_in_channel' => UserNotInChannel,
           'user_not_visible' => UserNotVisible,
diff --git a/lib/slack/web/api/slack-api-ref b/lib/slack/web/api/slack-api-ref
index a45def2a..0d3f0b66 160000
--- a/lib/slack/web/api/slack-api-ref
+++ b/lib/slack/web/api/slack-api-ref
@@ -1 +1 @@
-Subproject commit a45def2a00beeabf9ab6cfb8f98015369dcfa295
+Subproject commit 0d3f0b6629e1a13722604dcdfae53ad1b7a7f59e