diff --git a/doc/release-notes/release-notes-1.1.0.md b/doc/release-notes/release-notes-1.1.0.md
index ba8a39c48..37f803e6f 100644
--- a/doc/release-notes/release-notes-1.1.0.md
+++ b/doc/release-notes/release-notes-1.1.0.md
@@ -1,6 +1,14 @@
 Notable changes
 ===============
 
+Overwinter network upgrade
+--------------------------
+
+The activation height for the Overwinter network upgrade on mainnet is included
+in this release. Overwinter will activate on mainnet at height 347500, which is
+expected to be mined on the 25th of June 2018. Please upgrade to this release,
+or any subsequent release, in order to follow the Overwinter network upgrade.
+
 `-mempooltxinputlimit` deprecation
 ----------------------------------
 
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 4806dcfc5..ae9d82d52 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -102,8 +102,7 @@ public:
         consensus.vUpgrades[Consensus::UPGRADE_TESTDUMMY].nActivationHeight =
             Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;
         consensus.vUpgrades[Consensus::UPGRADE_OVERWINTER].nProtocolVersion = 170005;
-        consensus.vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight =
-            Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;
+        consensus.vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight = 347500;
 
         /**
          * The message start string should be awesome! ⓩ❤
diff --git a/src/version.h b/src/version.h
index 258534aa6..bf8c518d8 100644
--- a/src/version.h
+++ b/src/version.h
@@ -9,7 +9,7 @@
  * network protocol versioning
  */
 
-static const int PROTOCOL_VERSION = 170004;
+static const int PROTOCOL_VERSION = 170005;
 
 //! initial proto version, to be increased after version/verack negotiation
 static const int INIT_PROTO_VERSION = 209;