diff --git a/README.md b/README.md
index cb9d67d..8861ff2 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ cmake --build --preset attiny85-generated
 Presets cover attiny85/atmega328p in both libavr modes (generated and
 reflect); `ctest` runs the consteval battery over the BCD, the hours
 register's two formats, the weekday and the alarm rate encodings, and holds
-the example to its stated size — **1480 B** on the mega328P and **1238 B**
+the example to its stated size — **1480 B** on the mega328P and **1316 B**
 on the tiny85, byte-identical across the two modes. The legacy
 yazoalfa-based driver lives on the `master` branch.
 
diff --git a/libavr b/libavr
index 43fc479..aec9955 160000
--- a/libavr
+++ b/libavr
@@ -1 +1 @@
-Subproject commit 43fc4796c2670e522233bd95a982a688052b9cf3
+Subproject commit aec9955ad390bb0888eea4f0c21ea7936c7e879f
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index e5cb7e0..8fd0cfc 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -5,7 +5,7 @@ libavr_format_test()
 if(LIBAVR_MCU STREQUAL "atmega328p")
 	libavr_size_claim_test(clock 1480)
 elseif(LIBAVR_MCU STREQUAL "attiny85")
-	libavr_size_claim_test(clock 1238)
+	libavr_size_claim_test(clock 1316)
 endif()
 
 # The README says the two modes emit the same image, and only a tree with