diff --git a/debian/changelog b/debian/changelog
index 29a64280..3be534fe 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+davical (1.1.12-2.1) unstable; urgency=medium
+
+  * Non-maintainer upload
+  * Add support for PHPUnit 10 (Closes: #1039746)
+
+ -- David Prévot <taffit@debian.org>  Tue, 14 Jan 2025 13:45:14 +0100
+
 davical (1.1.12-2) unstable; urgency=medium
 
   * Cherry-pick two bug fixes from upstream:
diff --git a/debian/patches/0003-Add-support-for-phpunit-10.patch b/debian/patches/0003-Add-support-for-phpunit-10.patch
new file mode 100644
index 00000000..db1cb1f1
--- /dev/null
+++ b/debian/patches/0003-Add-support-for-phpunit-10.patch
@@ -0,0 +1,114 @@
+From: Athos Ribeiro <athoscribeiro@gmail.com>
+Date: Thu, 6 Jul 2023 16:28:53 -0300
+Subject: Add support for phpunit 10
+
+In phpunit 10, global states are no longer preserved by default [1].
+
+* https://bugs.debian.org/1039746
+
+[1] https://github.com/sebastianbergmann/phpunit/blob/10.0.0/ChangeLog-10.0.md#changed
+
+Origin: upstream, https://gitlab.com/davical-project/davical/-/commit/0502860a9543567e35bf4a770315c03220672c31
+Bug: https://gitlab.com/davical-project/davical/-/merge_requests/115
+Bug-Debian: https://bugs.debian.org/1039746
+---
+ testing/phpunit/ExpansionTest.php | 16 ++++++++++++++++
+ testing/phpunit/RangeTest.php     | 16 ++++++++++++++++
+ 2 files changed, 32 insertions(+)
+
+diff --git a/testing/phpunit/ExpansionTest.php b/testing/phpunit/ExpansionTest.php
+index 5a71318..7e5bf84 100644
+--- a/testing/phpunit/ExpansionTest.php
++++ b/testing/phpunit/ExpansionTest.php
+@@ -143,6 +143,10 @@ final class ExpansionTest extends TestCase
+     '20190124T000000Z/20190124T010000Z',
+   ];
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testUnmodifiedCal() {
+     global $base_cal;
+ 
+@@ -152,6 +156,10 @@ final class ExpansionTest extends TestCase
+     );
+   }
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testTueRenamed() {
+     global $tuesday_renamed_cal;
+ 
+@@ -161,6 +169,10 @@ final class ExpansionTest extends TestCase
+     );
+   }
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testTueRenamedSwapped() {
+     global $tuesday_renamed_cal_order_swapped;
+ 
+@@ -170,6 +182,10 @@ final class ExpansionTest extends TestCase
+     );
+   }
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testCalWithCount() {
+     global $count_cal;
+ 
+diff --git a/testing/phpunit/RangeTest.php b/testing/phpunit/RangeTest.php
+index 5b865d5..7c68d7a 100644
+--- a/testing/phpunit/RangeTest.php
++++ b/testing/phpunit/RangeTest.php
+@@ -12,6 +12,10 @@ $c->rrule_loop_limit = 100;
+ 
+ final class RangeTest extends TestCase
+ {
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testGetVCalendarRange() {
+     $cal = new vCalendar("BEGIN:VCALENDAR
+ PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
+@@ -48,6 +52,10 @@ END:VCALENDAR");
+     self::assertEquals("20190102T072000Z", (string) $range->until->UTC());
+   }
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testGetVCalendarRangeTwoDayAllDay() {
+     $cal = new vCalendar("BEGIN:VCALENDAR
+ PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
+@@ -70,6 +78,10 @@ END:VCALENDAR");
+     self::assertEquals("20190109T200000Z", (string) $range->until->UTC());
+   }
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testGetVCalendarRangeFloating() {
+     // When interpreted as being in Greece, this event crosses the daylight savings boundary!
+     // TODO deal with how that affects all-day events...
+@@ -94,6 +106,10 @@ END:VCALENDAR");
+     self::assertEquals("20181210T130000Z", (string) $range->until->UTC());
+   }
+ 
++  /**
++   * @runInSeparateProcess
++   * @preserveGlobalState enabled
++   */
+   public function testGetVCalendarRangeAllDayAcrossDST() {
+     // When interpreted as being in Greece, this event crosses the daylight savings boundary!
+ 
diff --git a/debian/patches/series b/debian/patches/series
index 94012acc..688fa630 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1,2 +1,3 @@
 1-use-.-to-concat-strings.patch
 2-add-missing-space-to-sql.patch
+0003-Add-support-for-phpunit-10.patch
diff --git a/debian/tests/phpunit b/debian/tests/phpunit
index af88450b..fa264d7a 100755
--- a/debian/tests/phpunit
+++ b/debian/tests/phpunit
@@ -4,5 +4,5 @@
 set -e
 
 # 2) phpunit tests
-phpunit --include-path "/usr/share/davical:/usr/share/awl" testing/phpunit
+phpunit --do-not-cache-result --include-path "/usr/share/davical:/usr/share/awl" testing/phpunit