diff --git a/pkgs/development/python-modules/graphite-web/default.nix b/pkgs/development/python-modules/graphite-web/default.nix
index 05c0c0d745e82..7a78a8f271a49 100644
--- a/pkgs/development/python-modules/graphite-web/default.nix
+++ b/pkgs/development/python-modules/graphite-web/default.nix
@@ -4,6 +4,10 @@
   pkgs,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch,
+
+  # build-system
+  setuptools,
 
   # dependencies
   cairocffi,
@@ -31,16 +35,21 @@
 
 buildPythonPackage {
   pname = "graphite-web";
-  version = "1.1.10-unstable-2025-02-24";
+  version = "1.2.1-pre2";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "graphite-project";
     repo = "graphite-web";
-    rev = "49c28e2015d605ad9ec93524f7076dd924a4731a";
-    hash = "sha256-TxsQPhnI5WhQvKKkDEYZ8xnyg/qf+N9Icej6d6A0jC0=";
+    tag = "1.2.1-pre2";
+    hash = "sha256-2C5iWn5/BoX0OPT/UQO94V1oZ/xiRzgoipp0551dnpM=";
   };
 
+  patches = [
+    # https://github.com/graphite-project/graphite-web/pull/2914
+    ./epoch-django5-localize-via-pytz.patch
+  ];
+
   postPatch = ''
     substituteInPlace webapp/graphite/settings.py \
       --replace-fail \
@@ -54,6 +63,8 @@ buildPythonPackage {
       --replace-fail "test_render_view" "_dont_test_render_view"
   '';
 
+  build-system = [ setuptools ];
+
   dependencies = [
     cairocffi
     django
@@ -89,9 +100,12 @@ buildPythonPackage {
   ];
 
   preCheck =
-    # Start a redis server
+    # Start a redis server on a per-build port. Darwin builds share the host
+    # network (no netns isolation), so concurrent builds would otherwise
+    # collide on the default port 6379. test_redis_tagdb reads TEST_REDIS_PORT.
     ''
-      ${pkgs.valkey}/bin/redis-server &
+      export TEST_REDIS_PORT=$(( ($$ % 20000) + 20000 ))
+      ${pkgs.valkey}/bin/redis-server --port "$TEST_REDIS_PORT" &
       REDIS_PID=$!
     '';
 
diff --git a/pkgs/development/python-modules/graphite-web/epoch-django5-localize-via-pytz.patch b/pkgs/development/python-modules/graphite-web/epoch-django5-localize-via-pytz.patch
new file mode 100644
index 0000000000000..a58abbd376d91
--- /dev/null
+++ b/pkgs/development/python-modules/graphite-web/epoch-django5-localize-via-pytz.patch
@@ -0,0 +1,13 @@
+diff --git a/webapp/graphite/util.py b/webapp/graphite/util.py
+index bb46fa16c..7152cb765 100644
+--- a/webapp/graphite/util.py
++++ b/webapp/graphite/util.py
+@@ -59,7 +59,7 @@ def epoch(dt):
+   if not dt.tzinfo:
+     tb = traceback.extract_stack(None, 2)
+     log.warning('epoch() called with non-timezone-aware datetime in %s at %s:%d' % (tb[0][2], tb[0][0], tb[0][1]))
+-    return calendar.timegm(make_aware(dt, pytz.timezone(settings.TIME_ZONE)).astimezone(pytz.utc).timetuple())
++    return calendar.timegm(pytz.timezone(settings.TIME_ZONE).localize(dt, is_dst=None).astimezone(pytz.utc).timetuple())
+   return calendar.timegm(dt.astimezone(pytz.utc).timetuple())
+ 
+