diff --git a/README.md b/README.md
index a09c29d..790a100 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Please see [the official Gluon repository](https://github.com/freifunk-gluon/glu
 
 #### Gluon versions used for specific Hamburg Freifunk Firmware builds
 
+- 0.5.1: v2014.3.1
 - 0.5: v2014.3
 - 0.4.2: v2014.2
  - note: no gluon fork used anymore
diff --git a/site.mk b/site.mk
index 072cd29..b57efa6 100644
--- a/site.mk
+++ b/site.mk
@@ -19,7 +19,7 @@ GLUON_SITE_PACKAGES := \
 	haveged
 
 
-DEFAULT_GLUON_RELEASE := 0.5
+DEFAULT_GLUON_RELEASE := 0.5.1
 
 # Allow overriding the release number from the command line
 GLUON_RELEASE ?= $(DEFAULT_GLUON_RELEASE)