diff --git a/default.bazelrc b/default.bazelrc
index 42d4f712..0d526964 100644
--- a/default.bazelrc
+++ b/default.bazelrc
@@ -1,6 +1,6 @@
-# Use C++17.
-build --cxxopt=-std=c++17
-build --host_cxxopt=-std=c++17
+# Use C++20.
+build --cxxopt=-std=c++20
+build --host_cxxopt=-std=c++20
 
 # Use Python 3.
 build --python_path=/usr/bin/python3