diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09b6349..147c8f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [v5.1.3] - 2023-07-28
+### Fixed
+- Include stdout + stderr in error messages.
+
 ## [v5.1.2] - 2023-07-28
 ### Fixed
 - Avoid duplicate `lua` dependencies in rockspec
diff --git a/lua/luarocks-tag-release.lua b/lua/luarocks-tag-release.lua
index 2ddbc13..a5d988c 100755
--- a/lua/luarocks-tag-release.lua
+++ b/lua/luarocks-tag-release.lua
@@ -76,7 +76,7 @@ local function luarocks_tag_release(package_name, package_version, specrev, args
     local stdout = read_file(exec_out) or ''
     local stderr = read_file(exec_err) or ''
     if exit_code ~= 0 then
-      on_failure('FAILED (exit code ' .. exit_code .. '): ' .. cmd .. ' ' .. stderr)
+      on_failure(cmd .. ' FAILED\nexit code: ' .. exit_code .. '\nstdout: ' .. stdout .. '\nstderr: ' .. stderr)
     end
     return stdout, stderr
   end