diff --git a/CHANGELOG.md b/CHANGELOG.md
index 891a4d76..ce274508 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,9 @@ change warranting a new major release:
 ## Changed
 
 - Add `-Wshadow=local` shadowing warnings and fixed all of them
+- Refactored IMTQ handlers to also perform low level I2C communication tasks in separate threads.
+  This avoids the various delays needed for I2C communication with that device inside the ACS PST.
+  (e.g. 1 ms delay between each transfer, or 10 ms integration delay for MGM measurements).
 
 ## Added
 
diff --git a/tmtc b/tmtc
index 802757ba..887e76ba 160000
--- a/tmtc
+++ b/tmtc
@@ -1 +1 @@
-Subproject commit 802757ba72acd2830c0768400b507db616a18e2d
+Subproject commit 887e76baf824735f2adff90a137431e37cdefc6a