diff --git a/test/known_failures_Linux.json b/test/known_failures_Linux.json
index aabbfbf..648215a 100644
--- a/test/known_failures_Linux.json
+++ b/test/known_failures_Linux.json
@@ -41,6 +41,12 @@
   "csharp-nodejs_json_framed-ip-ssl",
   "csharp-perl_binary_buffered-ip-ssl",
   "csharp-perl_binary_framed-ip-ssl",
+  "csharp-py3_binary_buffered-ip-ssl",
+  "csharp-py3_binary_framed-ip-ssl",
+  "csharp-py3_compact_buffered-ip-ssl",
+  "csharp-py3_compact_framed-ip-ssl",
+  "csharp-py3_json_buffered-ip-ssl",
+  "csharp-py3_json_framed-ip-ssl",
   "erl-cpp_compact_buffered-ip",
   "erl-cpp_compact_buffered-ip-ssl",
   "erl-cpp_compact_framed-ip",