diff --git a/development/scite/StringList.cxx.patch b/development/scite/StringList.cxx.patch
new file mode 100644
index 0000000000..86fa3d2a60
--- /dev/null
+++ b/development/scite/StringList.cxx.patch
@@ -0,0 +1,10 @@
+--- StringList.cxx	2023-07-26 07:50:38.000000000 +0200
++++ StringList.cxx.patched	2023-09-13 10:25:52.002946469 +0200
+@@ -8,6 +8,7 @@
+ #include <cstdlib>
+ #include <cassert>
+ #include <cstring>
++#include <cstddef>
+ 
+ #include <tuple>
+ #include <string>
diff --git a/development/scite/scite.SlackBuild b/development/scite/scite.SlackBuild
index 60c1cedc93..e9f844d85d 100644
--- a/development/scite/scite.SlackBuild
+++ b/development/scite/scite.SlackBuild
@@ -29,7 +29,7 @@
 cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=scite
-VERSION=${VERSION:-5.2.1}
+VERSION=${VERSION:-5.3.7}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
@@ -76,6 +76,9 @@ tar xvf $CWD/${PRGNAM}$(echo $VERSION | tr -d .).tgz
 chown -R root:root lexilla/ scite/ scintilla/
 chmod -R u+w,go+r-w,a-s lexilla/ scite/ scintilla/
 
+# Patch to fix missing cstddef header file.
+patch scite/src/StringList.cxx $CWD/StringList.cxx.patch
+
 cd $TMP/lexilla
 make -C src
 
diff --git a/development/scite/scite.info b/development/scite/scite.info
index 24c5e0729e..c91a649a32 100644
--- a/development/scite/scite.info
+++ b/development/scite/scite.info
@@ -1,10 +1,10 @@
 PRGNAM="scite"
-VERSION="5.2.1"
+VERSION="5.3.7"
 HOMEPAGE="https://scintilla.org/SciTE.html"
-DOWNLOAD="http://downloads.sourceforge.net/project/scintilla/SciTE/5.2.1/scite521.tgz"
-MD5SUM="b92cc64016a2ba4fd0423a75aa6bbc31"
+DOWNLOAD="https://scintilla.org/scite537.tgz"
+MD5SUM="4a4bc59da93deb4b75e5b0e15f2661c5"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""
 REQUIRES=""
-MAINTAINER="DhabyX"
-EMAIL="slack.dhabyx@gmail.com"
+MAINTAINER="rc-05"
+EMAIL="rc_o5@protonmail.com"