diff --git a/Makefile b/Makefile
index 83899fc..29ce59f 100644
--- a/Makefile
+++ b/Makefile
@@ -25,14 +25,14 @@ MRUBY_CFLAGS ?= -I./libs/mruby/build/host/include
 MRUBY_LIBS ?= -L./libs/mruby/build/host/lib -lmruby
 
 CFLAGS_DEBUG :=\
-	-std=c++20 -Wall -Wextra -static \
+	-std=c++26 -Wall -Wextra -static \
 	-O0 -fno-inline -gsplit-dwarf \
-	-g -fno-omit-frame-pointer \
+	-g -fno-omit-frame-pointer -ffast-math \
 	-I./include -I./libs/unicode_width
 
 CFLAGS_RELEASE :=\
-	-std=c++20 -O3 -march=x86-64 -mtune=generic -fno-rtti \
-	-fvisibility=hidden -static \
+	-std=c++26 -O3 -march=x86-64 -mtune=generic -fno-rtti \
+	-fvisibility=hidden -static -ffast-math \
 	-fomit-frame-pointer -DNDEBUG -s \
 	-I./include -I./libs/unicode_width