diff --git a/Makefile b/Makefile
index b6d080060..b70197109 100644
--- a/Makefile
+++ b/Makefile
@@ -101,19 +101,20 @@ XARGS ?= xargs -P4 -rs8000
 DOT ?= dot
 CLANG = clang
 TMPDIR = o/tmp
-AR = build/bootstrap/ar
-CP = build/bootstrap/cp
-RM = build/bootstrap/rm -f
-GZIP = build/bootstrap/gzip
-ECHO = build/bootstrap/echo
-CHMOD = build/bootstrap/chmod
-TOUCH = build/bootstrap/touch
-PKG = build/bootstrap/package
-MKDEPS = build/bootstrap/mkdeps
-ZIPOBJ = build/bootstrap/zipobj
-ZIPCOPY = build/bootstrap/zipcopy
-PECHECK = build/bootstrap/pecheck
-FIXUPOBJ = build/bootstrap/fixupobj
+AR = $(BOOTSTRAP)/ar.ape
+CP = $(BOOTSTRAP)/cp.ape
+RM = $(BOOTSTRAP)/rm.ape -f
+GZIP = $(BOOTSTRAP)/gzip.ape
+ECHO = $(BOOTSTRAP)/echo.ape
+CHMOD = $(BOOTSTRAP)/chmod.ape
+TOUCH = $(BOOTSTRAP)/touch.ape
+PKG = $(BOOTSTRAP)/package.ape
+MKDEPS = $(BOOTSTRAP)/mkdeps
+ZIPOBJ = $(BOOTSTRAP)/zipobj
+ZIPCOPY = $(BOOTSTRAP)/zipcopy
+PECHECK = $(BOOTSTRAP)/pecheck
+FIXUPOBJ = $(BOOTSTRAP)/fixupobj
+OBJBINCOPY = $(BOOTSTRAP)/objbincopy
 MKDIR = build/bootstrap/mkdir -p
 COMPILE = build/bootstrap/compile -V9 -M2048m -P8192 $(QUOTA)
 
@@ -149,9 +150,10 @@ export MODE
 export SOURCE_DATE_EPOCH
 export TMPDIR
 
-COSMOCC = .cosmocc/3.3.5
+COSMOCC = .cosmocc/3.5.7
+BOOTSTRAP = $(COSMOCC)/bin
 TOOLCHAIN = $(COSMOCC)/bin/$(ARCH)-linux-cosmo-
-DOWNLOAD := $(shell build/download-cosmocc.sh $(COSMOCC) 3.3.5 db78fd8d3f8706e9dff4be72bf71d37a3f12062f212f407e1c33bc4af3780dd0)
+DOWNLOAD := $(shell build/download-cosmocc.sh $(COSMOCC) 3.5.7 596876951b62ad2530c63afc40edd805d751fcb2416e544d249af04ad00bb4ed)
 
 AS = $(TOOLCHAIN)as
 CC = $(TOOLCHAIN)gcc
diff --git a/ape/BUILD.mk b/ape/BUILD.mk
index 3bbf00e60..25542e0d5 100644
--- a/ape/BUILD.mk
+++ b/ape/BUILD.mk
@@ -218,10 +218,10 @@ o/$(MODE)/ape/loader-xnu-clang.asm: ape/loader.c
 	@$(COMPILE) -AOBJECTIFY.c $(CLANG) -DSUPPORT_VECTOR=8 -S -g0 $(APE_LOADER_FLAGS)
 
 o/$(MODE)/ape/ape.elf: o/$(MODE)/ape/ape.elf.dbg
-	@$(COMPILE) -AOBJBINCOPY -w build/bootstrap/objbincopy -f -o $@ $<
+	@$(COMPILE) -AOBJBINCOPY -w $(OBJBINCOPY) -f -o $@ $<
 
 o/$(MODE)/ape/ape.macho: o/$(MODE)/ape/ape.elf.dbg
-	@$(COMPILE) -AOBJBINCOPY -w build/bootstrap/objbincopy -fm -o $@ $<
+	@$(COMPILE) -AOBJBINCOPY -w $(OBJBINCOPY) -fm -o $@ $<
 
 APE_LOADER_LDFLAGS =				\
 	-static					\
diff --git a/build/bootstrap/ar b/build/bootstrap/ar
deleted file mode 100755
index 0a671a3b1..000000000
Binary files a/build/bootstrap/ar and /dev/null differ
diff --git a/build/bootstrap/chmod b/build/bootstrap/chmod
deleted file mode 100755
index e42818495..000000000
Binary files a/build/bootstrap/chmod and /dev/null differ
diff --git a/build/bootstrap/cp b/build/bootstrap/cp
deleted file mode 100755
index de2d52a67..000000000
Binary files a/build/bootstrap/cp and /dev/null differ
diff --git a/build/bootstrap/echo b/build/bootstrap/echo
deleted file mode 100755
index 6ce62f8bd..000000000
Binary files a/build/bootstrap/echo and /dev/null differ
diff --git a/build/bootstrap/fixupobj b/build/bootstrap/fixupobj
deleted file mode 100755
index b59b55a5b..000000000
Binary files a/build/bootstrap/fixupobj and /dev/null differ
diff --git a/build/bootstrap/gzip b/build/bootstrap/gzip
deleted file mode 100755
index 09bd2306b..000000000
Binary files a/build/bootstrap/gzip and /dev/null differ
diff --git a/build/bootstrap/mkdeps b/build/bootstrap/mkdeps
deleted file mode 100755
index 30b5e5f06..000000000
Binary files a/build/bootstrap/mkdeps and /dev/null differ
diff --git a/build/bootstrap/objbincopy b/build/bootstrap/objbincopy
deleted file mode 100755
index 8cce21b7c..000000000
Binary files a/build/bootstrap/objbincopy and /dev/null differ
diff --git a/build/bootstrap/package b/build/bootstrap/package
deleted file mode 100755
index 1c7db4131..000000000
Binary files a/build/bootstrap/package and /dev/null differ
diff --git a/build/bootstrap/pecheck b/build/bootstrap/pecheck
deleted file mode 100755
index 6536a79bf..000000000
Binary files a/build/bootstrap/pecheck and /dev/null differ
diff --git a/build/bootstrap/rm b/build/bootstrap/rm
deleted file mode 100755
index 85f08d8b8..000000000
Binary files a/build/bootstrap/rm and /dev/null differ
diff --git a/build/bootstrap/touch b/build/bootstrap/touch
deleted file mode 100755
index 7b6bc4943..000000000
Binary files a/build/bootstrap/touch and /dev/null differ
diff --git a/build/bootstrap/zipcopy b/build/bootstrap/zipcopy
deleted file mode 100755
index 8023194c7..000000000
Binary files a/build/bootstrap/zipcopy and /dev/null differ
diff --git a/build/bootstrap/zipobj b/build/bootstrap/zipobj
deleted file mode 100755
index 019751ea1..000000000
Binary files a/build/bootstrap/zipobj and /dev/null differ
diff --git a/build/sanitycheck b/build/sanitycheck
index 7808571f4..2ed283ee5 100755
--- a/build/sanitycheck
+++ b/build/sanitycheck
@@ -31,7 +31,7 @@ if [ ! -f /proc/sys/fs/binfmt_misc/status ]; then
   exit 0
 fi
 
-if ! build/bootstrap/echo.com -n; then
+if ! build/bootstrap/echo -n; then
   cat <<'EOF' >&2
 
 ERROR
diff --git a/test/libc/mem/BUILD.mk b/test/libc/mem/BUILD.mk
index 44385da00..ec48d8263 100644
--- a/test/libc/mem/BUILD.mk
+++ b/test/libc/mem/BUILD.mk
@@ -85,7 +85,7 @@ o/$(MODE)/test/libc/mem/prog/life.elf:				\
 		o/$(MODE)/tool/build/assimilate			\
 		o/$(MODE)/test/libc/mem/prog/life
 	@$(COMPILE) -wACP -T$@					\
-		build/bootstrap/cp				\
+		$(CP)						\
 		o/$(MODE)/test/libc/mem/prog/life		\
 		o/$(MODE)/test/libc/mem/prog/life.elf
 	@$(COMPILE) -wAASSIMILATE -T$@				\
@@ -116,7 +116,7 @@ o/$(MODE)/test/libc/mem/prog/sock.elf:				\
 		o/$(MODE)/tool/build/assimilate			\
 		o/$(MODE)/test/libc/mem/prog/sock
 	@$(COMPILE) -wACP -T$@					\
-		build/bootstrap/cp				\
+		$(CP)						\
 		o/$(MODE)/test/libc/mem/prog/sock		\
 		o/$(MODE)/test/libc/mem/prog/sock.elf
 	@$(COMPILE) -wAASSIMILATE -T$@				\
diff --git a/tool/cosmocc/package.sh b/tool/cosmocc/package.sh
index 0ad1fc091..2b97b477c 100755
--- a/tool/cosmocc/package.sh
+++ b/tool/cosmocc/package.sh
@@ -88,6 +88,7 @@ make -j64 m=$ARM64 \
   o/$ARM64/tool/build/package.dbg \
   o/$ARM64/tool/build/rm.dbg \
   o/$ARM64/tool/build/touch.dbg \
+  o/$ARM64/tool/build/mkdir.dbg \
   o/$ARM64/tool/build/sha256sum.dbg \
   o/$ARM64/tool/build/resymbol.dbg \
   o/$ARM64/third_party/make/make.dbg \
@@ -174,7 +175,8 @@ cp -f o/$AMD64/ape/ape.macho "$OUTDIR/bin/ape-x86_64.macho"
 cp -f o/$ARM64/ape/ape.elf "$OUTDIR/bin/ape-aarch64.elf"
 
 for x in assimilate march-native mktemper fixupobj zipcopy apelink pecheck mkdeps zipobj \
-         ar chmod cocmd cp echo gzip objbincopy package rm touch sha256sum resymbol; do
+         ar chmod cocmd cp echo gzip objbincopy package rm touch mkdir compile sha256sum \
+         resymbol; do
   ape $APELINK \
     -l o/$AMD64/ape/ape.elf \
     -l o/$ARM64/ape/ape.elf \
@@ -184,7 +186,7 @@ for x in assimilate march-native mktemper fixupobj zipcopy apelink pecheck mkdep
     o/$ARM64/tool/build/$x.dbg
 done
 
-for x in ar chmod cp echo gzip package rm touch sha256sum; do
+for x in ar chmod cp echo gzip package rm touch mkdir compile sha256sum; do
   mv "$OUTDIR/bin/$x" "$OUTDIR/bin/$x.ape"
 done