diff --git a/CHANGELOG.md b/CHANGELOG.md
index 07828f1da..27db3fdec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+2021-10-04 v1.5.1
+=================
+
+Nimbus `v1.5.1` is a `high-urgency` release for all users who have already upgraded to `v1.5.0`. It fixes a deposit contract syncing issue manifesting as the warning message "Eth1 chain not synced". Under specific circumstances, such a failure to sync the Eth1 chain may result in missed Eth2 block proposals, so affected users are advised to upgrade as soon as possible.
+
+For anyone still running Nimbus v1.4.x or earlier, migrating to v1.5.1 continues to be a `medium-urgency` but *mandatory* upgrade that must be installed **before October 27th**.
+
+
 2021-10-04 v1.5.0
 =================
 
diff --git a/beacon_chain/version.nim b/beacon_chain/version.nim
index d60b2886e..41c684132 100644
--- a/beacon_chain/version.nim
+++ b/beacon_chain/version.nim
@@ -15,7 +15,7 @@ when not defined(nimscript):
 const
   versionMajor* = 1
   versionMinor* = 5
-  versionBuild* = 0
+  versionBuild* = 1
 
   versionBlob* = "stateofus" # Single word - ends up in the default graffitti