diff --git a/.gitignore b/.gitignore
index 6fc5ccf9..cd2ff8ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@
 !.nvmrc
 !.pre-commit-config.yaml
 !.prettierignore
+!.python-version
 !.renovate-shared.json*
 !.reuse
 
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d2e41dec..0da880bf 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,9 +11,8 @@ ci:
 
 default_language_version:
   node: lts
-  # 2024-07-23: Kali Linux python3 is 3.11.9, which apparently is incompatible
-  # with the rest of this config.
-  python: python3.12
+  # Remember .python-version !
+  python: 3.12.4
   ruby: .ruby-version
 
 repos:
diff --git a/.python-version b/.python-version
new file mode 100644
index 00000000..455808f8
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.12.4