diff --git a/akka-docs/src/main/paradox/_template/projectSpecificFooter.st b/akka-docs/src/main/paradox/_template/projectSpecificFooter.st
new file mode 100644
index 0000000000..a10db6f4e7
--- /dev/null
+++ b/akka-docs/src/main/paradox/_template/projectSpecificFooter.st
@@ -0,0 +1 @@
+<script type="text/javascript" src="$page.base$assets/js/warnOldDocs.js"></script>
diff --git a/akka-docs/src/main/paradox/assets/js/warnOldDocs.js b/akka-docs/src/main/paradox/assets/js/warnOldDocs.js
new file mode 100644
index 0000000000..afa64c4e19
--- /dev/null
+++ b/akka-docs/src/main/paradox/assets/js/warnOldDocs.js
@@ -0,0 +1,186 @@
+jQuery(document).ready(function ($) {
+
+  function initOldVersionWarnings($) {
+    $.get("//akka.io/versions.json", function (akkaVersionsData) {
+      var site = extractCurrentPageInfo();
+      if (site.v === 'snapshot') {
+        showSnapshotWarning(site)
+      } else {
+        var matchingMinor =
+          Object.keys(akkaVersionsData[site.p])
+            .find(function(s) { return site.v.startsWith(s) })
+        if (matchingMinor) {
+          showVersionWarning(site, akkaVersionsData, matchingMinor)
+        }
+      }
+    })
+  }
+
+  function getInstead(akkaVersionsData, project, instead) {
+    if (Array.isArray(instead)) {
+      var found = akkaVersionsData[instead[0]][instead[1]]
+      var proj = instead[0]
+    } else {
+      var found = akkaVersionsData[project][instead]
+      var proj = project
+    }
+    return {"latest": found.latest, "project": proj}
+  }
+
+  function targetUrl(samePage, site, instead) {
+    var page = site.r
+    if (samePage !== true) {
+      // FIXME not valid anymore
+      if (page.substring(0, 5) == 'scala') {
+        page = 'scala.html'
+      } else if (page.substring(0, 4) == 'java') {
+        page = 'java.html'
+      } else {
+        page = 'index.html'
+      }
+    }
+    var project = instead.project
+    if (!project) {
+      project = site.p
+    }
+    return site.b + project + '/' + instead.latest + '/' + page
+  }
+
+  function showWarning(site, visitedVersion, text) {
+    // sneaking the style in here to make life simple
+    $('head').append('<style>' +
+      '.page-content .oldVersion.callout .ack-button {' +
+      '  display: inline-block;' +
+      '  background-color: rgb(255, 83, 75);' +
+      'color: #fff;' +
+      ' text-decoration: none;' +
+      ' padding: 10px;' +
+    '})')
+    var $warningPopup = $('<div class="callout warning oldVersion">').append(text)
+    var $close = $('<a href="#" class="ack-button">✓ Dismiss Warning for a Day</a>')
+      .click(function () {
+        ackVersionForADay(site.p, visitedVersion)
+        $warningPopup.animate({ height: 0 }, 400, "swing", function() {
+          $warningPopup.hide()
+        })
+      })
+
+    $warningPopup
+      .hide()
+      .append($close)
+      .prependTo("#docs")
+      .show()
+  }
+
+  function showVersionWarning(site, akkaVersionsData, series) {
+    var version = site.v,
+      seriesInfo = akkaVersionsData[site.p][series]
+
+
+    if (versionWasAcked(site.p, version)) {
+      // hidden for a day
+    } else if (seriesInfo.outdated) {
+      var instead = getInstead(akkaVersionsData, site.p, seriesInfo.instead)
+      var insteadSeries = targetUrl(false, site, instead)
+      var insteadPage = targetUrl(true, site, instead)
+
+      showWarning(
+        site,
+        version,
+        '<h3 class="callout-title">Old Version</h3>' +
+        '<p><span style="font-weight: bold">This version of Akka (' + site.p + ' / ' + version + ') is outdated and not supported! </span></p>' +
+        '<p>Please upgrade to version <a href="' + insteadSeries + '">' + instead.latest + '</a> as soon as possible.</p>' +
+        '<p id="samePageLink"></p>')
+
+      $.ajax({
+        url: insteadPage,
+        type: 'HEAD',
+        success: function () {
+          $('#samePageLink').html('<a href="' + insteadPage + '">Click here to go to the same page on the ' + instead.latest + ' version of the docs.</a>');
+        }
+      });
+    } else if (version != seriesInfo.latest) {
+      showWarning(
+        site,
+        version,
+        '<h3 class="callout-title">Outdated version</h3>' +
+        '<p>You are browsing the docs for Akka ' + version + ', however the latest release in this series is: ' +
+          '<a href="' + targetUrl(true, site, seriesInfo) + '">' + seriesInfo.latest + '</a>. <br/></p>');
+    }
+  }
+
+  function showSnapshotWarning(site) {
+    if (!versionWasAcked(site.p, 'snapshot')) {
+      var instead = {'latest': 'current'};
+      var insteadSeries = targetUrl(false, site, instead);
+      var insteadPage = targetUrl(true, site, instead);
+
+      showWarning(
+        site,
+        'snapshot',
+        '<h3 class="callout-title">Snapshot docs</h3>' +
+        '<p><span style="font-weight: bold">You are browsing the snapshot documentation, which most likely does not correspond to the artifacts you are using! </span></p>' +
+        '<p>We recommend that you head over to <a href="' + insteadSeries + '">the latest stable version</a> instead.</p>' +
+        '<p id="samePageLink"></p>')
+      $.ajax({
+        url: insteadPage,
+        type: 'HEAD',
+        success: function () {
+          $('#samePageLink').html('<a href="' + insteadPage + '">Click here to go to the same page on the latest stable version of the docs.</a>');
+        }
+      })
+    }
+  }
+
+
+  function extractCurrentPageInfo() {
+    var path = window.location.pathname,
+      base = '' + window.location
+
+    // strip off leading /docs/
+    path = path.substring(path.indexOf("akka"))
+    base = base.substring(0, base.indexOf(path))
+    var projectEnd = path.indexOf("/")
+    var versionEnd = path.indexOf("/", projectEnd + 1)
+    var project = path.substring(0, projectEnd)
+    var version = path.substring(projectEnd + 1, versionEnd)
+    var rest = path.substring(versionEnd + 1)
+    return {"b": base, "p": project, "v": version, "r": rest}
+  }
+
+
+// --- ack outdated versions ---
+
+  function ackVersionCookieName(project, version) {
+    return "ack-" + project + "-" + version
+  }
+
+  function ackVersionForADay(project, version) {
+    function setCookie(cname, cvalue, exdays) {
+      var d = new Date()
+      d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000))
+      var expires = "expires=" + d.toUTCString()
+      document.cookie = cname + "=" + cvalue + "; " + expires
+    }
+
+    setCookie(ackVersionCookieName(project, version), 'true', 1)
+  }
+
+  function versionWasAcked(project, version) {
+    function getCookie(cname) {
+      var name = cname + "="
+      var ca = document.cookie.split(';')
+      for (var i = 0; i < ca.length; i++) {
+        var c = ca[i];
+        while (c.charAt(0) == ' ') c = c.substring(1)
+        if (c.indexOf(name) == 0) return c.substring(name.length, c.length)
+      }
+      return ""
+    }
+
+    return getCookie(ackVersionCookieName(project, version)) === 'true';
+  }
+
+
+  initOldVersionWarnings($)
+})
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 2794c2fab8..c24fa9b19c 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -18,7 +18,7 @@ addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.3.4")
 addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.2.2-RC2")
 addSbtPlugin("io.spray" % "sbt-boilerplate" % "0.6.1")
 addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.3.1")
-addSbtPlugin("com.lightbend.akka" % "sbt-paradox-akka" % "0.8")
+addSbtPlugin("com.lightbend.akka" % "sbt-paradox-akka" % "0.9")
 addSbtPlugin("com.lightbend" % "sbt-whitesource" % "0.1.12")
 addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "0.9.3")
 addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.9.0") // for advanced PR validation features