diff --git a/tools/flex/Makefile b/tools/flex/Makefile
index 60ca240af6..f170be53da 100644
--- a/tools/flex/Makefile
+++ b/tools/flex/Makefile
@@ -7,11 +7,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=flex
-PKG_VERSION:=2.6.1
+PKG_VERSION:=2.6.3
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/westes/flex/releases/download/v$(PKG_VERSION)/
-PKG_HASH:=2c7a412c1640e094cb058d9b2fe39d450186e09574bebb7aa28f783e3799103f
+PKG_HASH:=68b2742233e747c462f781462a2a1e299dc6207401dac8f0bbb316f48565c2aa
 
 HOST_BUILD_PARALLEL:=1
 
diff --git a/tools/flex/patches/100-disable-tests-docs.patch b/tools/flex/patches/100-disable-tests-docs.patch
index d6e289d5b3..f298bc911d 100644
--- a/tools/flex/patches/100-disable-tests-docs.patch
+++ b/tools/flex/patches/100-disable-tests-docs.patch
@@ -1,6 +1,6 @@
 --- a/Makefile.am
 +++ b/Makefile.am
-@@ -45,10 +45,7 @@
+@@ -45,10 +45,7 @@ EXTRA_DIST = \
  SUBDIRS = \
  	lib \
  	src \