diff --git a/python-websockets.changes b/python-websockets.changes
index e00786b..3f5384f 100644
--- a/python-websockets.changes
+++ b/python-websockets.changes
@@ -2,6 +2,8 @@
 Tue May  6 09:28:40 UTC 2025 - Daniel Garcia <daniel.garcia@suse.com>
 
 - Skip flaky tests for s390x
+- Increase WEBSOCKETS_TESTS_TIMEOUT_FACTOR to 50 to fix flaky tests in
+  different architectures, bsc#1242254
 
 -------------------------------------------------------------------
 Fri Feb 14 12:10:52 UTC 2025 - Nico Krapp <nico.krapp@suse.com>
diff --git a/python-websockets.spec b/python-websockets.spec
index f315a4d..7370119 100644
--- a/python-websockets.spec
+++ b/python-websockets.spec
@@ -56,7 +56,7 @@ export CFLAGS="%{optflags}"
 
 %check
 # Test execution speed depends on BS load and architecture, relax
-export WEBSOCKETS_TESTS_TIMEOUT_FACTOR=10
+export WEBSOCKETS_TESTS_TIMEOUT_FACTOR=50
 # Disable flaky tests gh#python-websockets/websockets#1322
 donttest="test_close_waits_for_close_frame"
 # Disable broken tests with openssl 3.2 and python < 3.11
@@ -69,6 +69,7 @@ donttest+=" or test_decompress_max_size"
 donttest+=" or test_encode_decode_fragmented_binary_frame"
 donttest+=" or test_encode_decode_fragmented_text_frame"
 donttest+=" or test_remote_no_context_takeove"
+donttest+=" or test_writing_in_send_context_fails"
 %endif
 
 %pytest_arch -v -k "not ($donttest)" tests