diff --git a/tools/internal_ci/linux/psm-csm.cfg b/tools/internal_ci/linux/psm-csm.cfg
index bc44a745869..3ffc9b0582a 100644
--- a/tools/internal_ci/linux/psm-csm.cfg
+++ b/tools/internal_ci/linux/psm-csm.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: 180
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"