diff --git a/.gitmodules b/.gitmodules
index dcb71ab..e91e301 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -22,6 +22,6 @@
 [submodule "sysa/tcc-0.9.27"]
 	path = sysa/tcc-0.9.27
 	url = git://repo.or.cz/tinycc.git
-[submodule "sysa/sed-1.18"]
-	path = sysa/sed-1.18
-	url = git://git.savannah.gnu.org/sed/sed-history.git
+[submodule "sysa/sed-4.0.7"]
+	path = sysa/sed-4.0.7
+	url = https://git.savannah.gnu.org/git/sed/sed-history.git
diff --git a/rootfs.sh b/rootfs.sh
index 09007c8..f570fe7 100755
--- a/rootfs.sh
+++ b/rootfs.sh
@@ -75,9 +75,9 @@ popd
 
 mkdir -p ../sources
 
-# sed 1.18
-cp sed-1.18.kaem tmp/after
-cp -r sed-1.18 tmp/after
+# sed 4.0.7
+cp sed-4.0.7.kaem tmp/after
+cp -r sed-4.0.7 tmp/after
 
 # General cleanup
 find tmp -name .git -exec rm -rf \;
diff --git a/sysa/after.kaem.run b/sysa/after.kaem.run
index 9c80b03..05e3ca0 100755
--- a/sysa/after.kaem.run
+++ b/sysa/after.kaem.run
@@ -49,6 +49,6 @@ kaem --file mes.kaem
 kaem --file tcc.kaem
 
 # Part 7: sed
-cd sed-1.18
-kaem --file ../sed-1.18.kaem
+cd sed-4.0.7
+kaem --file ../sed-4.0.7.kaem
 cd ..
diff --git a/sysa/sed-1.18 b/sysa/sed-1.18
deleted file mode 160000
index cff4df5..0000000
--- a/sysa/sed-1.18
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit cff4df55786bae5f4f0c042a13d30cd1a962040c
diff --git a/sysa/sed-1.18.kaem b/sysa/sed-1.18.kaem
deleted file mode 100755
index 43596da..0000000
--- a/sysa/sed-1.18.kaem
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/sh
-
-set -ex
-
-# Variables
-bindir=/after/bin
-
-# Compile
-tcc -c getopt1.c
-tcc -c getopt.c
-tcc -c regex.c
-tcc -c utils.c
-tcc -c -Dalloca alloca.c
-tcc -c -DHAVE_BCOPY sed.c
-
-# Link
-tcc -static -o ${bindir}/sed alloca.o getopt1.o getopt.o regex.o sed.o utils.o
diff --git a/sysa/sed-4.0.7 b/sysa/sed-4.0.7
new file mode 160000
index 0000000..b8fb156
--- /dev/null
+++ b/sysa/sed-4.0.7
@@ -0,0 +1 @@
+Subproject commit b8fb156db0eedfd28db3340b418591e8fcab08bc
diff --git a/sysa/sed-4.0.7.kaem b/sysa/sed-4.0.7.kaem
new file mode 100755
index 0000000..dade234
--- /dev/null
+++ b/sysa/sed-4.0.7.kaem
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+set -ex
+
+# Variables
+bindir=/after/bin
+
+catm config.h
+
+# Compile
+
+## libsed.a
+cd lib
+
+tcc -c getopt1.c
+tcc -c -I .. getopt.c
+tcc -c -I .. -DENABLE_NLS=0 utils.c
+cp regex_.h regex.h
+tcc -c -I . regex.c
+tcc -c obstack.c
+tcc -c strverscmp.c
+tcc -c getline.c
+tcc -c -DHAVE_FCNTL_H mkstemp.c
+
+tcc -ar cr libsed.a getopt1.o getopt.o utils.o regex.o obstack.o strverscmp.o getline.o mkstemp.o
+cd ..
+
+## sed
+tcc -c -I . -I lib -DSED_FEATURE_VERSION=\"4.0\" sed/compile.c
+tcc -c -I . -I lib sed/execute.c
+tcc -c -I . -I lib sed/regex.c
+tcc -c -I . -I lib sed/fmt.c
+tcc -c -I . -I lib -DPACKAGE=\"sed\" -DVERSION=\"4.0.7\" sed/sed.c
+
+# Link
+tcc -static -o ${bindir}/sed -L lib lib/libsed.a compile.o execute.o regex.o fmt.o sed.o -lsed
+