diff --git a/python-HyperKitty.changes b/python-HyperKitty.changes
index a4a4c43..2850f1b 100644
--- a/python-HyperKitty.changes
+++ b/python-HyperKitty.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Mar 11 13:19:11 UTC 2025 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Add reproducible.patch for reproducible builds
+
 -------------------------------------------------------------------
 Thu Nov  7 11:33:38 UTC 2024 - Markéta Machová <mmachova@suse.com>
 
diff --git a/python-HyperKitty.spec b/python-HyperKitty.spec
index b9057c6..f4fc262 100644
--- a/python-HyperKitty.spec
+++ b/python-HyperKitty.spec
@@ -92,6 +92,7 @@ Patch0:         hyperkitty-settings.patch
 Patch98:        gl-mr300-add-opengraph-metadata.patch
 # PATCH-FIX-UPSTREAM gl-mr470-introduce-feed-filtering.patch gl#mailman/hyperkitty#470
 Patch99:        gl-mr470-introduce-feed-filtering.patch
+Patch100:       reproducible.patch
 #
 BuildRequires:  %{python_module Django >= %{django_min_version} with %python-Django < %{django_max_version}}
 BuildRequires:  %{python_module Whoosh}
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..1e1cb66
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,27 @@
+https://gitlab.com/mailman/hyperkitty/-/merge_requests/656
+
+From 3961ea048f00da1004bbfe22f43ea2a494279d49 Mon Sep 17 00:00:00 2001
+From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
+Date: Mon, 16 Dec 2024 16:08:45 +0100
+Subject: [PATCH] Use content based hashing
+
+for deterministic .css files
+Without this patch, the mode defaulted to `mtime`
+and caused variations between builds.
+
+Fixes #527
+
+This patch was done while working on reproducible builds for openSUSE, sponsored by the NLnet NGI0 fund.
+
+diff --git a/example_project/settings.py b/example_project/settings.py
+index ec7f742..1c53df6 100644
+--- a/build_static_files/settings.py
++++ b/build_static_files/settings.py
+@@ -304,6 +304,7 @@ SOCIALACCOUNT_PROVIDERS = {
+ # django-compressor
+ # https://pypi.python.org/pypi/django_compressor
+ #
++COMPRESS_CSS_HASHING_METHOD = 'content'
+ COMPRESS_PRECOMPILERS = (
+    ('text/x-scss', 'sassc -t compressed {infile} {outfile}'),
+    ('text/x-sass', 'sassc -t compressed {infile} {outfile}'),