diff --git a/NEWS.md b/NEWS.md
index b85a178..657df4d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,9 @@
 # pkgcache (development version)
 
+* pkgcache now detects the `macos.binary.arm64` package type that R-devel
+  (4.7.0) uses on macOS arm64, and looks for binaries in
+  `bin/macos/arm64/contrib/<x.y>`, where CRAN now serves them.
+
 * Binary packages from a PPM `manylinux` repository now have the correct
   platform, e.g. `aarch64-unknown-linux-gnu-manylinux-2.28`. Similarly,
   `ppm_platforms()` now reports the correct glibc version of `manylinux`
diff --git a/R/platform.R b/R/platform.R
index 52f4e72..d56cdc7 100644
--- a/R/platform.R
+++ b/R/platform.R
@@ -53,6 +53,10 @@
 #'   - `aarch64-apple-darwin23-mac.binary.sonoma-arm64`: macOS Sonoma on
 #'     arm64. (This is the same as `aarch64-apple-darwin23`, which pkgcache
 #'     already knows about, so `current_r_platform()` uses the shorter form.)
+#'   - `aarch64-apple-darwin23-macos.binary.arm64`: macOS on arm64, as built
+#'     by R-devel (4.7.0). Unlike the `mac.binary.*` types above this one is
+#'     kept in the platform name, because its binaries live in
+#'     `bin/macos/arm64/contrib/<x.y>`.
 #'
 #'   A package type on its own, without a platform triple, is not a valid
 #'   platform name.
@@ -214,6 +218,16 @@ pkg_type_system_for_os <- function(os) {
   )
 }
 
+# All `<system>` names a package type may use for an OS name. macOS has two:
+# `macosx` for the classic `mac.binary*` types, and `macos` for the
+# `macos.binary.*` types that R-devel (4.7.0) uses on arm64, which serve
+# binaries from `bin/macos/<build>/contrib/<x.y>`.
+
+pkg_type_systems_for_os <- function(os) {
+  sys <- pkg_type_system_for_os(os)
+  if (!is.na(sys) && sys == "macosx") c("macosx", "macos") else sys
+}
+
 # The custom package type of the current R, or NULL
 
 current_r_custom_pkg_type <- function(os) {
@@ -222,7 +236,7 @@ current_r_custom_pkg_type <- function(os) {
     return(NULL)
   }
   pt <- parse_pkg_type(type)
-  if (!identical(pt$system, pkg_type_system_for_os(os))) {
+  if (!pt$system %in% pkg_type_systems_for_os(os)) {
     return(NULL)
   }
   type
diff --git a/man/current_r_platform.Rd b/man/current_r_platform.Rd
index d65a1e2..8b7d6c5 100644
--- a/man/current_r_platform.Rd
+++ b/man/current_r_platform.Rd
@@ -94,6 +94,10 @@ built with clang.
 \item \code{aarch64-apple-darwin23-mac.binary.sonoma-arm64}: macOS Sonoma on
 arm64. (This is the same as \code{aarch64-apple-darwin23}, which pkgcache
 already knows about, so \code{current_r_platform()} uses the shorter form.)
+\item \code{aarch64-apple-darwin23-macos.binary.arm64}: macOS on arm64, as built
+by R-devel (4.7.0). Unlike the \verb{mac.binary.*} types above this one is
+kept in the platform name, because its binaries live in
+\verb{bin/macos/arm64/contrib/<x.y>}.
 }
 
 A package type on its own, without a platform triple, is not a valid
diff --git a/tests/testthat/test-platform.R b/tests/testthat/test-platform.R
index 9966ffe..e05daff 100644
--- a/tests/testthat/test-platform.R
+++ b/tests/testthat/test-platform.R
@@ -106,6 +106,28 @@ test_that("current_r_custom_pkg_type", {
   # the package type must belong to the platform
   expect_null(current_r_custom_pkg_type("darwin23"))
   expect_null(current_r_custom_pkg_type(NA_character_))
+
+  # R-devel (4.7.0) on macOS arm64, `<system>` is `macos`, not `macosx`
+  fake(
+    current_r_custom_pkg_type,
+    "current_r_pkg_type",
+    "macos.binary.arm64"
+  )
+  expect_equal(
+    current_r_custom_pkg_type("darwin23"),
+    "macos.binary.arm64"
+  )
+  expect_null(current_r_custom_pkg_type("mingw32"))
+  expect_null(current_r_custom_pkg_type(NA_character_))
+})
+
+test_that("pkg_type_systems_for_os", {
+  # macOS accepts both the classic and the R-devel spelling
+  expect_equal(pkg_type_systems_for_os("darwin23"), c("macosx", "macos"))
+  expect_equal(pkg_type_systems_for_os("darwin17.0"), c("macosx", "macos"))
+  expect_equal(pkg_type_systems_for_os("mingw32"), "windows")
+  expect_equal(pkg_type_systems_for_os("linux-gnu"), "linux")
+  expect_equal(pkg_type_systems_for_os(NA_character_), NA_character_)
 })
 
 test_that("default_platforms", {
@@ -227,6 +249,14 @@ test_that("get_all_package_dirs, custom binary package types", {
     )$contriburl,
     "bin/macosx/sonoma-arm64/contrib/4.7"
   )
+  # R-devel (4.7.0) on macOS arm64 moved to `bin/macos/arm64`
+  expect_equal(
+    get_all_package_dirs(
+      "aarch64-apple-darwin23-macos.binary.arm64",
+      "4.7.0"
+    )$contriburl,
+    "bin/macos/arm64/contrib/4.7"
+  )
   # a package type without a `<build>` part
   expect_equal(
     get_all_package_dirs(