diff --git a/src/flex.mk b/src/flex.mk
index 8847e243..5f242e20 100644
--- a/src/flex.mk
+++ b/src/flex.mk
@@ -3,8 +3,8 @@
 
 PKG             := flex
 $(PKG)_IGNORE   :=
-$(PKG)_VERSION  := 2.5.37
-$(PKG)_CHECKSUM := db4b140f2aff34c6197cab919828cc4146aae218
+$(PKG)_VERSION  := 2.5.39
+$(PKG)_CHECKSUM := 267794c709d5c50f2dcb48ff5d8dcbbfe40f953e
 $(PKG)_SUBDIR   := flex-$($(PKG)_VERSION)
 $(PKG)_FILE     := flex-$($(PKG)_VERSION).tar.bz2
 $(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/project/flex/$($(PKG)_FILE)