diff --git a/tools/internal_ci/linux/psm-dualstack.cfg b/tools/internal_ci/linux/psm-dualstack.cfg
index 78e2b9f22882c..a467a611e20a4 100644
--- a/tools/internal_ci/linux/psm-dualstack.cfg
+++ b/tools/internal_ci/linux/psm-dualstack.cfg
@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/psm-interop-test-cpp.sh"
-timeout_mins: 120
+timeout_mins: 240
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"