diff --git a/mk/main.mk b/mk/main.mk
index 6b409eebc74c8..9cd30be6531d1 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -13,7 +13,7 @@
 ######################################################################
 
 # The version number
-CFG_RELEASE_NUM=1.17.0
+CFG_RELEASE_NUM=1.16.0
 
 # An optional number to put after the label, e.g. '.2' -> '-beta.2'
 # NB Make sure it starts with a dot to conform to semver pre-release
diff --git a/src/stage0.txt b/src/stage0.txt
index 4be9e3e57baac..1235fec0c699a 100644
--- a/src/stage0.txt
+++ b/src/stage0.txt
@@ -12,5 +12,5 @@
 # tarball for a stable release you'll likely see `1.x.0-$date` where `1.x.0` was
 # released on `$date`
 
-rustc: beta-2016-12-20
-cargo: bfee18f73287687c543bda8c35e4e33808792715
+rustc: 1.15.0-2017-01-31
+cargo: 6e0c18cccc8b0c06fba8a8d76486f81a792fb420