diff --git a/components/persistent_data/README.md b/components/persistent_data/README.md
index 54de4c3511..2d615a65be 100644
--- a/components/persistent_data/README.md
+++ b/components/persistent_data/README.md
@@ -175,10 +175,11 @@ A version number reused for a different layout therefore loads with
 `layout_mismatch` instead of producing garbage, and a reader without the C++
 type (a Python tool) can compute the same fingerprint from a field spec.
 
-alpaca's own `with_version` option is deliberately not used: its hash folds
-`sizeof(struct)` in, which differs between a 32-bit ESP32 and a 64-bit host
-(a struct of a string, a vector and an integer is 40 bytes on the ESP32, 56 on
-macOS and 64 on Linux), so a file written on one would not load on the other.
+alpaca's own `with_version` option is not used: the fingerprint above covers
+more (enum underlying types, array lengths) and is computable from a field spec
+by a reader without the C++ type. (Before alpaca #56 the alpaca hash also folded
+`sizeof(struct)` in, which differs between a 32-bit ESP32 and a 64-bit host, so
+a file written on one would not have loaded on the other.)
 
 ## Errors
 
diff --git a/components/persistent_data/include/detail/persistent_data_codec.hpp b/components/persistent_data/include/detail/persistent_data_codec.hpp
index b2214f4f10..5e57f10be9 100644
--- a/components/persistent_data/include/detail/persistent_data_codec.hpp
+++ b/components/persistent_data/include/detail/persistent_data_codec.hpp
@@ -42,11 +42,12 @@ namespace espp::persistent_data {
 /// @brief Serialization options used for the payload.
 /// @details `strict` rejects payloads that are shorter than the type;
 ///          `fixed_length_encoding` keeps the encoding independent of the
-///          values stored. alpaca's own `with_version` is deliberately not used:
-///          its hash folds `sizeof(struct)` in, which differs between a 32-bit
-///          ESP32 and a 64-bit host, so a file written on one would not load on
-///          the other. The header's layout fingerprint (see layout::fingerprint)
-///          plays that role portably.
+///          values stored. alpaca's own `with_version` is not used: the header's
+///          layout fingerprint (see layout::fingerprint) plays that role, and it
+///          also encodes enum underlying types and array lengths and can be
+///          computed from a field spec by a reader without the C++ type. (Before
+///          alpaca #56 the alpaca hash also folded `sizeof(struct)` in, which
+///          differs between a 32-bit ESP32 and a 64-bit host.)
 inline constexpr alpaca::options SERIALIZATION_OPTIONS =
     alpaca::options::fixed_length_encoding | alpaca::options::strict;
 
diff --git a/components/serialization/detail/alpaca b/components/serialization/detail/alpaca
index 83a592f0c3..8f022bdb51 160000
--- a/components/serialization/detail/alpaca
+++ b/components/serialization/detail/alpaca
@@ -1 +1 @@
-Subproject commit 83a592f0c3807500f1aaf3b07fd48105a01e2780
+Subproject commit 8f022bdb510600f3e569bf05fc33b11dd7bd27c4