diff --git a/bindings/matrix-sdk-ffi/changelog.d/6763.changed.md b/bindings/matrix-sdk-ffi/changelog.d/6763.changed.md
new file mode 100644
index 000000000..f0c3ce8a9
--- /dev/null
+++ b/bindings/matrix-sdk-ffi/changelog.d/6763.changed.md
@@ -0,0 +1,2 @@
+[**breaking**] `ClientBuildError::WellKnownLookupFailed` inner type is now
+`Box`ed to reduce the error enum's size.
diff --git a/crates/matrix-sdk/changelog.d/6763.changed.md b/crates/matrix-sdk/changelog.d/6763.changed.md
new file mode 100644
index 000000000..811b02dd4
--- /dev/null
+++ b/crates/matrix-sdk/changelog.d/6763.changed.md
@@ -0,0 +1,3 @@
+[**breaking**] `QRCodeGrantLoginError::UnexpectedMessage`'s `received` field
+type and `ClientBuildError::AutoDiscovery`'s inner type are now `Box`ed to
+reduce the error enums' sizes.