diff --git a/nixos/doc/manual/release-notes/rl-2305.section.md b/nixos/doc/manual/release-notes/rl-2305.section.md
index abaefac66e3c..22b1fe885cc3 100644
--- a/nixos/doc/manual/release-notes/rl-2305.section.md
+++ b/nixos/doc/manual/release-notes/rl-2305.section.md
@@ -99,6 +99,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - Calling `makeSetupHook` without passing a `name` argument is deprecated.
 
+- The `cosmoc` package has been removed. The upstream scripts in `cosmocc` should be used instead.
+
 - Qt 5.12 and 5.14 have been removed, as the corresponding branches have been EOL upstream for a long time. This affected under 10 packages in nixpkgs, largely unmaintained upstream as well, however, out-of-tree package expressions may need to be updated manually.
 
 - The [services.wordpress.sites.<name>.plugins](#opt-services.wordpress.sites._name_.plugins) and [services.wordpress.sites.<name>.themes](#opt-services.wordpress.sites._name_.themes) options have been converted from sets to attribute sets to allow for consumers to specify explicit install paths via attribute name.
diff --git a/pkgs/development/tools/cosmoc/default.nix b/pkgs/development/tools/cosmoc/default.nix
deleted file mode 100644
index e64cf02e9f7e..000000000000
--- a/pkgs/development/tools/cosmoc/default.nix
+++ /dev/null
@@ -1,41 +0,0 @@
-{ stdenv, lib, cosmopolitan }:
-
-stdenv.mkDerivation {
-  pname = "cosmoc";
-  inherit (cosmopolitan) version;
-
-  doInstallCheck = true;
-  dontUnpack = true;
-  dontBuild = true;
-
-  # compiler arguments based on upstream README.md
-  installPhase = ''
-    runHook preInstall
-    mkdir -p $out/bin
-    cat <<EOF >$out/bin/cosmoc
-    #!${stdenv.shell}
-    exec ${stdenv.cc}/bin/${stdenv.cc.targetPrefix}gcc \
-      -Os -static -nostdlib -nostdinc -fno-pie -no-pie -mno-red-zone \
-      -fno-omit-frame-pointer -pg -mnop-mcount -mno-tls-direct-seg-refs \
-      "\$@" \
-      -fuse-ld=bfd -Wl,-T,${cosmopolitan}/lib/ape.lds -Wl,--gc-sections \
-      -include ${cosmopolitan}/include/cosmopolitan.h \
-      ${cosmopolitan}/lib/{crt.o,ape-no-modify-self.o,cosmopolitan.a}
-    EOF
-    chmod +x $out/bin/cosmoc
-    runHook postInstall
-  '';
-
-  installCheckPhase = ''
-    printf 'main() { printf("hello world\\n"); }\n' >hello.c
-    $out/bin/cosmoc hello.c
-    ./a.out
-  '';
-
-  meta = with lib; {
-    homepage = "https://justine.lol/cosmopolitan/";
-    description = "compiler for Cosmopolitan C programs";
-    license = licenses.mit;
-    maintainers = teams.cosmopolitan.members;
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 91450b149754..9bf74f533f8b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -19293,8 +19293,6 @@ with pkgs;
 
   cog = callPackage ../development/web/cog { };
 
-  cosmoc = callPackage ../development/tools/cosmoc { };
-
   cosmopolitan = callPackage ../development/libraries/cosmopolitan { };
 
   python-cosmopolitan = callPackage ../development/interpreters/python-cosmopolitan { };