diff --git a/build.xml b/build.xml
index 4ba366c..ffd852c 100644
--- a/build.xml
+++ b/build.xml
@@ -25,6 +25,9 @@
     <property name="changedTemplatesRegex"><![CDATA[<template name="()" version="${targetVersionCode}">]]></property>
 
     <property name="sourceGitRepository" value="https://github.com/mybb/mybb.git" />
+    <property name="issuesRepository" value="${sourceGitRepository}" />
+    <property name="resolvedIssuesMilestone" override="false" value="${targetVersion}" />
+    <property name="resolvedIssuesLink" value="https://github.com/mybb/mybb/issues?q=is%3Aissue%20is%3Aclosed%20label%3As%3Aresolved%20milestone%3A${resolvedIssuesMilestone}" />
 
     <!-- output settings -->
     <property name="distSetSourceSubdirectory" value="Upload" />
@@ -450,6 +453,9 @@
             --updateSetName '${updateSetName}'
             --targetVersion '${targetVersion}'
             --targetVersionCode '${targetVersionCode}'
+            --issuesRepository '${issuesRepository}'
+            --resolvedIssuesMilestone '${resolvedIssuesMilestone}'
+            --resolvedIssuesLink '${resolvedIssuesLink}'
             --distVersionDataFile '${distVersionDataFile}'" />
     </target>
 
diff --git a/php/version-data.php b/php/version-data.php
index 878f622..3bd54b7 100644
--- a/php/version-data.php
+++ b/php/version-data.php
@@ -11,9 +11,20 @@
     'updateSetName:',
     'targetVersion:',
     'targetVersionCode:',
+    'issuesRepository:',
+    'resolvedIssuesMilestone:',
+    'resolvedIssuesLink:',
     'distVersionDataFile:',
 ]);
 
+define('MY_USERAGENT', 'mybb/mybb-build');
+define('DEFAULT_CURLOPTS', [
+    CURLOPT_USERAGENT => MY_USERAGENT,
+    CURLOPT_TIMEOUT => 10,
+    CURLOPT_RETURNTRANSFER => 1,
+    CURLOPT_SSL_VERIFYPEER => 1,
+]);
+
 function arrayToYml($array, $level = 1)
 {
     $output = null;
@@ -60,6 +71,144 @@ function directoryStructureSort($a, $b) {
     }
 }
 
+function fetchJson($ch, $path) {
+    $curlopt = [
+        CURLOPT_URL => $path,
+    ] + DEFAULT_CURLOPTS;
+
+    curl_setopt_array($ch, $curlopt);
+
+    $response = curl_exec($ch);
+
+    $data = json_decode($response, true);
+
+    if ($data === null) {
+        return null;
+    }
+
+    return $data;
+}
+
+function fetchJsonPaged($ch, $path, $sep, $callback, $perPage=100) {
+    $results = [];
+    $page = 1;
+
+    $curlopt = [
+        CURLOPT_HEADER => 1,
+    ] + DEFAULT_CURLOPTS;
+
+    while ($page !== null) {
+        $curlopt[CURLOPT_URL] = $path . $sep . 'per_page=' . $perPage . '&page=' . $page;
+
+        curl_setopt_array($ch, $curlopt);
+
+        $response = curl_exec($ch);
+
+        $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
+        $header = substr($response, 0, $header_size);
+        $body = substr($response, $header_size);
+
+        $data = json_decode($body, true);
+
+        if ($data === null) {
+            break;
+        }
+
+        foreach ($data as $item) {
+            $result = $callback($item);
+            if ($result === null) {
+                continue;
+            }
+
+            $results[] = $result;
+        }
+
+        preg_match('/^Link:(.*?)&page=([0-9]+)>; rel="next"/im', $header, $matches);
+
+        if ($matches) {
+            $page = $matches[2];
+        } else {
+            $page = null;
+        }
+    }
+
+    return $results;
+}
+
+function getGithubIssueAges($ch, $repo, $resolvedIssuesMilestone) {
+    $githubApiPath = 'https://api.github.com/repos/' . $repo . '/';
+
+    $milestones = fetchJsonPaged($ch, $githubApiPath . 'milestones?state=all', '&', function($item) use ($resolvedIssuesMilestone) {
+        if ($item['title'] === $resolvedIssuesMilestone) {
+            return $item;
+        }
+
+        return null;
+    });
+
+    if (empty($milestones[0])) {
+        return null;
+    }
+
+    $path = $githubApiPath . 'issues?milestone=' . $milestones[0]['number'] . '&state=closed';
+
+    $issueAges = fetchJsonPaged($ch, $path, '&', function($item) {
+        if (empty($item['closed_at']) || !empty($item['pull_request'])) {
+            return null;
+        }
+
+        $created = DateTime::createFromFormat(DateTime::ISO8601, $item['created_at']);
+        $closed = DateTime::createFromFormat(DateTime::ISO8601, $item['closed_at']);
+
+        if ($created === false || $closed === false) {
+            return null;
+        }
+
+        $interval = $created->diff($closed);
+        return (int) $interval->format('%a');
+    });
+
+    return $issueAges;
+}
+
+function getIssuesData($ch, $issuesRepository, $resolvedIssuesMilestone) {
+    $parsed = parse_url($issuesRepository);
+
+    if ($parsed === false) {
+        return null;
+    }
+
+    $repo = trim(preg_replace('/\.git$/', '', $parsed['path']), '/');
+
+    switch ($parsed['host']) {
+        case 'github.com':
+            $issueAges = getGithubIssueAges($ch, $repo, $resolvedIssuesMilestone);
+        break;
+        default:
+            return null;
+    }
+
+    sort($issueAges);
+
+    $numIssues = count($issueAges);
+
+    if ($numIssues == 0) {
+        return null;
+    }
+
+    if ($numIssues % 2 === 0) {
+        $median = ($issueAges[($numIssues/2)-1] + $issueAges[$numIssues/2]) / 2;
+    } else {
+        $median = $issueAges[intdiv($numIssues, 2)];
+    }
+
+    return [
+        'medianAge' => $median,
+        'meanAge' => round(array_sum($issueAges) / $numIssues, 1),
+        'numIssues' => $numIssues,
+    ];
+}
+
 // changed files YML
 $file = $args['distChangedFilesFile'];
 
@@ -175,6 +324,30 @@ function directoryStructureSort($a, $b) {
     }
 }
 
+// resolved issue YML
+$resolvedIssuesYml = '';
+
+$ch = curl_init();
+
+$issuesData = getIssuesData($ch, $args['issuesRepository'], $args['resolvedIssuesMilestone']);
+
+if ($issuesData !== null) {
+    $resolvedIssuesYml .= <<<YML
+resolved_issues_number: "{$issuesData['numIssues']}"
+resolved_issues_age_median: "{$issuesData['medianAge']}"
+resolved_issues_age_mean: "{$issuesData['meanAge']}"
+
+YML;
+}
+
+$resolvedIssuesYml .= <<<YML
+resolved_issues_link: {$args['resolvedIssuesLink']}"
+
+
+YML;
+
+curl_close($ch);
+
 // packages YML
 $distSetPackageSize = round(filesize($args['buildDirectory'] . '/' . $args['distSetName'].'.zip') / 1024 / 1024, 2);
 $updateSetPackageSize = round(filesize($args['buildDirectory'] . '/' . $args['updateSetName'].'.zip') / 1024 / 1024, 2);
@@ -242,7 +415,7 @@ function directoryStructureSort($a, $b) {
         filesize: "{$updateSetPackageSize} MB"
         checksums:
 {$updateSetPackageChecksumsYml}
-{$changedLanguageFilesNumberYml}{$changedFilesYml}{$removedFilesYml}{$changedTemplatesYml}
+{$resolvedIssuesYml}{$changedLanguageFilesNumberYml}{$changedFilesYml}{$removedFilesYml}{$changedTemplatesYml}
 ---
 YML;