diff --git a/Misc/NEWS.d/next/Build/2025-08-27-09-52-45.gh-issue-138061.fMVS9w.rst b/Misc/NEWS.d/next/Build/2025-08-27-09-52-45.gh-issue-138061.fMVS9w.rst
new file mode 100644
index 00000000000000..7af79d0b87ef55
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-08-27-09-52-45.gh-issue-138061.fMVS9w.rst
@@ -0,0 +1 @@
+Ensure reproducible builds by making JIT stencil header generation deterministic.
diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py
index 7e261c9f8e297f..c3ce24643fd4a6 100644
--- a/Tools/jit/_targets.py
+++ b/Tools/jit/_targets.py
@@ -71,6 +71,9 @@ def _compute_digest(self) -> str:
         hasher.update(PYTHON_EXECUTOR_CASES_C_H.read_bytes())
         hasher.update((self.pyconfig_dir / "pyconfig.h").read_bytes())
         for dirpath, _, filenames in sorted(os.walk(TOOLS_JIT)):
+            # Exclude cache files from digest computation to ensure reproducible builds.
+            if dirpath.endswith("__pycache__"):
+                continue
             for filename in filenames:
                 hasher.update(pathlib.Path(dirpath, filename).read_bytes())
         return hasher.hexdigest()