diff --git a/pkgs/o/os.lua b/pkgs/o/os.lua
index 6bb851a5..e7f12c89 100644
--- a/pkgs/o/os.lua
+++ b/pkgs/o/os.lua
@@ -17,8 +17,19 @@ package = {
     repo        = "https://github.com/mcpplibs/os",
     type        = "package",
 
+    extensions = {
+        autoupdate = {
+            tag = "${version}",
+            url = "https://github.com/mcpplibs/os/archive/refs/tags/${tag}.tar.gz",
+        },
+    },
+
     xpm = {
         linux = {
+            ["0.1.1"] = {
+                url    = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.1.tar.gz",
+                sha256 = "c5abfb625ded0d5d837b799722c836c302460251d47081fef7a57a2a12e6b2b9",
+            },
             ["0.1.0"] = {
                 url    = {
                     GLOBAL = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.0.tar.gz",
@@ -28,6 +39,10 @@ package = {
             },
         },
         macosx = {
+            ["0.1.1"] = {
+                url    = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.1.tar.gz",
+                sha256 = "c5abfb625ded0d5d837b799722c836c302460251d47081fef7a57a2a12e6b2b9",
+            },
             ["0.1.0"] = {
                 url    = {
                     GLOBAL = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.0.tar.gz",
@@ -37,6 +52,10 @@ package = {
             },
         },
         windows = {
+            ["0.1.1"] = {
+                url    = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.1.tar.gz",
+                sha256 = "c5abfb625ded0d5d837b799722c836c302460251d47081fef7a57a2a12e6b2b9",
+            },
             ["0.1.0"] = {
                 url    = {
                     GLOBAL = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.0.tar.gz",
diff --git a/tests/examples/os/mcpp.toml b/tests/examples/os/mcpp.toml
index 90a02f63..ba244646 100644
--- a/tests/examples/os/mcpp.toml
+++ b/tests/examples/os/mcpp.toml
@@ -6,7 +6,7 @@ name    = "os-tests"
 version = "0.1.0"
 
 [dependencies.mcpplibs]
-os = "0.1.0"
+os = "0.1.1"
 
 [indices]
 mcpplibs = { path = "../../.." }
diff --git a/tests/examples/os/tests/os.cpp b/tests/examples/os/tests/os.cpp
index 978a1610..76cdc9d3 100644
--- a/tests/examples/os/tests/os.cpp
+++ b/tests/examples/os/tests/os.cpp
@@ -21,6 +21,12 @@ int main(int argc, char** argv) {
     check(!os::fs::publish(file, "second").has_value(), "a published name is not replaced");
     check(os::fs::read(file).value_or("") == "first", "and keeps what was published first");
 
+    // 0.1.1: a name the Windows code page cannot spell, both ways (UTF-8 throughout).
+    const std::string name = "\xE4\xB8\xAD\xE6\x96\x87 \xD0\xBA\xD0\xB8\xD1\x80.txt";
+    const auto wide = dir / os::fs::from_utf8(name);
+    check(os::fs::write(wide, "ok").has_value() && os::fs::read(wide).value_or("") == "ok", "a file whose name is not ASCII");
+    check(os::fs::utf8(wide.filename()) == name, "and its name reads back as UTF-8");
+
     const char sep = os::conventions().path_list_separator;
     const auto parts = os::env::split_list(std::string("a") + sep + sep + "b");
     check(parts.size() == 2, "a list of directories splits at the host's separator");