diff --git a/CHANGELOG.md b/CHANGELOG.md
index e323611..0d3bb52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.4.3
+
+- **openkal 0.25 and the implementations of its family are admitted.** The
+  requirements are ranges over both families: openkal `>=0.24.0, <0.26.0`,
+  openkal-linux `>=0.25.0, <0.27.0`, openkal-macos `>=0.22.0, <0.24.0`,
+  openkal-windows `>=0.20.0, <0.22.0`, openkal-emscripten `>=0.13.0, <0.15.0`.
+  A graph that holds the 0.24 family builds as before, and one that holds the
+  0.25 family --- the implementations' own tests, which reach this package
+  through mtest while the package under test stands for itself --- resolves too.
+  Nothing this library calls changed; it states no newer mcpp than before.
+
 ## 0.4.2
 
 - **Which names changed (`fs::watcher`).** A watcher holds names --- files and
diff --git a/mcpp.toml b/mcpp.toml
index 4ff7318..f4a463d 100644
--- a/mcpp.toml
+++ b/mcpp.toml
@@ -1,7 +1,7 @@
 [package]
 namespace   = "mcpplibs"
 name        = "os"
-version     = "0.4.2"
+version     = "0.4.3"
 description = "mcpplibs.os: a C++ operating-system library over openkal --- processes, files, environment, terminals, directories and local IPC, with compile-time platform constants and a few platform modules."
 license     = "Apache-2.0"
 authors     = ["mcpplibs"]
@@ -12,23 +12,23 @@ repo        = "https://github.com/mcpplibs/os"
 # own C and C++ runtime. A program that wants the standalone arrangement, or
 # the image arrangement of `<arch>-openkal`, selects it in its own manifest.
 [dependencies]
-openkal = "^0.24.0"
+openkal = ">=0.24.0, <0.26.0"
 
 [target.linux.dependencies]
-openkal-linux = "^0.25.0"
+openkal-linux = ">=0.25.0, <0.27.0"
 
 [target.macos.dependencies]
-openkal-macos = "^0.22.0"
+openkal-macos = ">=0.22.0, <0.24.0"
 
 [target.windows.dependencies]
-openkal-windows = "^0.20.0"
+openkal-windows = ">=0.20.0, <0.22.0"
 
 # Emscripten (`wasm32-emscripten`): openkal written above the C library, with
 # twelve of openkal's fifteen interfaces. `openkal.process', `openkal.exec' and
 # `openkal.space' are absent, so a program that starts one fails at link
 # naming the symbol; `openkal.task' is present in a `-pthread' link only.
 [target.'cfg(os = "emscripten")'.dependencies]
-openkal-emscripten = "^0.13.0"
+openkal-emscripten = ">=0.13.0, <0.15.0"
 
 [targets.os]
 kind = "lib"