diff --git a/repos/base/mk/global.mk b/repos/base/mk/global.mk
index 75cfaff415..4bf5f6943d 100644
--- a/repos/base/mk/global.mk
+++ b/repos/base/mk/global.mk
@@ -195,7 +195,7 @@ CC_ADA_OPT += $(filter-out -fno-builtin-cos -fno-builtin-sin \
 # We substitute '.' characters by '_' to allow a source-file-specific
 # C++ standard option for files with more than one dot in their name.
 #
-CC_CXX_OPT_STD ?= -std=gnu++17
+CC_CXX_OPT_STD ?= -std=gnu++20
 CC_CXX_OPT += $(lastword $(CC_CXX_OPT_STD) $(CC_CXX_OPT_STD_$(subst .,_,$*)))
 
 #