diff --git a/dev-info/index.html b/dev-info/index.html
index c844c37..1848a67 100644
--- a/dev-info/index.html
+++ b/dev-info/index.html
@@ -142,6 +142,6 @@
 <script src="/js/flavors.js"></script>
 <script src="/js/cat.js"></script>
 <script src="/js/heatmap.js"></script>
-<script>ContribHeatmap.render("#contrib", { theme: "trans" });</script>
+<script>ContribHeatmap.render("#contrib", { theme: "forest" });</script>
 
 </html>
\ No newline at end of file
diff --git a/hardware-info/index.html b/hardware-info/index.html
index 6984f03..b57eddb 100644
--- a/hardware-info/index.html
+++ b/hardware-info/index.html
@@ -238,6 +238,5 @@
 <script src="/js/flavors.js"></script>
 <script src="/js/cat.js"></script>
 <script src="/js/heatmap.js"></script>
-<script>ContribHeatmap.render("#contrib", { theme: "trans" });</script>
 
 </html>
\ No newline at end of file
diff --git a/index.html b/index.html
index 0e5b340..0697480 100644
--- a/index.html
+++ b/index.html
@@ -123,6 +123,4 @@
 <script src="/js/flavors.js"></script>
 <script src="/js/cat.js"></script>
 <script src="/js/heatmap.js"></script>
-<script>ContribHeatmap.render("#contrib", { theme: "trans" });</script>
-
 </html>
\ No newline at end of file
diff --git a/js/heatmap.js b/js/heatmap.js
index b09569b..414075e 100644
--- a/js/heatmap.js
+++ b/js/heatmap.js
@@ -1,7 +1,7 @@
 (function (global) {
   "use strict";
 
-  /* ---- core logic (unchanged from the working version) ---- */
+  /* ---- core logic ---- */
   function sundayOf(date) {
     const sunday = new Date(date);
     sunday.setUTCDate(sunday.getUTCDate() - sunday.getUTCDay());
@@ -28,6 +28,19 @@
     }
     return week;
   }
+  // The current week is truncated to "today" (per the viewer's clock) so future
+  // cells don't render. But the data source has its own clock; if it reports a
+  // contribution dated later in the current week than the viewer's clock thinks
+  // "now" is, that day's index lands past the truncated array. Grow the week to
+  // fit any real data point instead of writing off the end (week[idx] undefined).
+  function ensureDay(week, idx) {
+    while (week.length <= idx) {
+      const date = new Date(week[0].date + "T00:00:00Z");
+      date.setUTCDate(date.getUTCDate() + week.length);
+      week.push({ sources: {}, contributions: 0, date: date.toISOString().slice(0, 10) });
+    }
+    return week[idx];
+  }
   function buildHeatmapData(sources) {
     const weeks = new Map();
     for (const sourceName of Object.keys(sources)) {
@@ -39,9 +52,10 @@
         if (day.contributions > 0) {
           const week = weeks.get(key);
           const idx = new Date(day.timestamp * 1000).getUTCDay();
-          week[idx].contributions += day.contributions;
-          if (!week[idx].sources[sourceName]) week[idx].sources[sourceName] = 0;
-          week[idx].sources[sourceName] += day.contributions;
+          const cell = ensureDay(week, idx);
+          cell.contributions += day.contributions;
+          if (!cell.sources[sourceName]) cell.sources[sourceName] = 0;
+          cell.sources[sourceName] += day.contributions;
         }
       }
     }
@@ -259,4 +273,4 @@
   function textSpan(t) { const s = document.createElement("span"); s.textContent = t; return s; }
 
   global.ContribHeatmap = { render };
-})(typeof window !== "undefined" ? window : this);
\ No newline at end of file
+})(typeof window !== "undefined" ? window : this);