diff --git a/.gitignore b/.gitignore
index 2b342e5145..6146d47a3f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,3 +53,6 @@ eden-windows-msvc
 artifacts
 *.AppImage*
 /install*
+
+# Prevent clobbering with upstream docs
+/docs/CPMUtil.md
diff --git a/CMakeModules/CPM.cmake b/CMakeModules/CPM.cmake
index 5544d8eefe..2d97f5493c 100644
--- a/CMakeModules/CPM.cmake
+++ b/CMakeModules/CPM.cmake
@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: Copyright 2025 crueter
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# This is a slightly modified version of CPM.cmake
+
 # CPM.cmake - CMake's missing package manager
 # ===========================================
 # See https://github.com/cpm-cmake/CPM.cmake for usage and update instructions.
diff --git a/tools/shellcheck.sh b/tools/shellcheck.sh
index 719c717cf2..832b7496c7 100755
--- a/tools/shellcheck.sh
+++ b/tools/shellcheck.sh
@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-FileCopyrightText: Copyright 2025 crueter
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # fd is slightly faster on NVMe (the syntax sux though)
diff --git a/tools/update-cpm.sh b/tools/update-cpm.sh
index 8bd8df2b83..6ca23fc2d6 100755
--- a/tools/update-cpm.sh
+++ b/tools/update-cpm.sh
@@ -1,6 +1,16 @@
 #!/bin/sh -e
 
-# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-FileCopyrightText: Copyright 2025 crueter
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-wget -O CMakeModules/CPM.cmake https://github.com/cpm-cmake/CPM.cmake/releases/latest/download/CPM.cmake
+# updates CPMUtil, its docs, and related tools from the latest release
+
+if command -v zstd > /dev/null; then
+    EXT=tar.zst
+else
+    EXT=tar.gz
+fi
+
+wget "https://git.crueter.xyz/CMake/CPMUtil/releases/download/continuous/CPMUtil.$EXT"
+tar xf "CPMUtil.$EXT"
+rm "CPMUtil.$EXT"