diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..d3c826a
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,5 @@
+nodejs 24.13.0
+actionlint 1.7.10
+shellcheck 0.11.0
+python 3.14.3
+poetry 2.3.2
diff --git a/.tool-versions.asdf b/.tool-versions.asdf
new file mode 100644
index 0000000..4921076
--- /dev/null
+++ b/.tool-versions.asdf
@@ -0,0 +1,2 @@
+# define the .asdf-version to use here
+0.18.0