diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40622385..d88cf5ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,8 @@ will consitute of a breaking change warranting a new major release:
   equal or above v4. However, this software version is compatible to both v3 and v4 of the firmware.
 - The firmware version variables are global statics inititalized early during the program
   runtime now. This makes it possible to check the firmware version earlier.
+- The TCS controller will now always command heaters OFF when being blind for thermal
+  components (no sensors available), irrespective of current switch state.
 
 ## Fixed
 
diff --git a/tmtc b/tmtc
index 6d5bde40..069f84d2 160000
--- a/tmtc
+++ b/tmtc
@@ -1 +1 @@
-Subproject commit 6d5bde40db69534a8cea923f96145bdeb62b79af
+Subproject commit 069f84d2207c03e8d334cfce3f7dd530babe17b0