diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e3485dda..e5e5eb33f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
     - FlipBoard Simon (by @jamisonderek)
   - GPIO/FlipperHTTP: Free Roam (by @jblanked)
   - GPIO/GPS: [NMEA] Nearby Files (by @Stichoza)
+  - GPIO/Sensors: [MH-Z19] CO2 Logger (by @harryob2)
   - iButton: iButton Converter (by @Leptopt1los)
   - Infrared:
     - Hitachi AC Remote (by @dogtopus)
diff --git a/applications/external b/applications/external
index 688ba667e..3eb543782 160000
--- a/applications/external
+++ b/applications/external
@@ -1 +1 @@
-Subproject commit 688ba667ef4d44b2cb75fe3be37c4cb33cd3e00d
+Subproject commit 3eb5437821c4731a319820542c1334f6ad1c9907