diff --git a/scripts/alphanet_constants.patch b/scripts/alphanet_constants.patch
index 89cdb7214..eaabb8b3c 100644
--- a/scripts/alphanet_constants.patch
+++ b/scripts/alphanet_constants.patch
@@ -1,25 +1,22 @@
 diff --git a/src/proto_alpha/lib_protocol/src/constants_repr.ml b/src/proto_alpha/lib_protocol/src/constants_repr.ml
-index 7aedfb62..c9e3881d 100644
+index 8ccaaee8..b88c1ae7 100644
 --- a/src/proto_alpha/lib_protocol/src/constants_repr.ml
 +++ b/src/proto_alpha/lib_protocol/src/constants_repr.ml
-@@ -64,15 +64,14 @@ type constants = {
- let read_public_key s = Ed25519.Public_key.of_hex_exn (`Hex s)
+@@ -68,12 +68,12 @@ let read_public_key s = Ed25519.Public_key.of_hex_exn (`Hex s)
  
  let default = {
--  cycle_length = 2048l ;
--  voting_period_length = 32768l ;
-+  cycle_length = 128l ;
-+  voting_period_length = 1024l ;
-   time_before_reward =
-     Period_repr.of_seconds_exn
--      (* One year in seconds *)
--      Int64.(mul 365L (mul 24L 3600L)) ;
-+      Int64.(mul 6L 3600L) ; (* 6 hours *)
-   slot_durations =
+   preserved_cycles = 5 ;
+-  blocks_per_cycle = 4096l ;
+-  blocks_per_commitment = 32l ;
+-  blocks_per_roll_snapshot = 256l ;
+-  blocks_per_voting_period = 32768l ;
++  blocks_per_cycle = 128l ;
++  blocks_per_commitment = 8l ;
++  blocks_per_roll_snapshot = 32l ;
++  blocks_per_voting_period = 1024l ;
+   time_between_blocks =
 -    List.map Period_repr.of_seconds_exn [ 60L ] ;
--  first_free_baking_slot = 16 ;
 +    List.map Period_repr.of_seconds_exn [ 60L ; 30L ; 20L ; 10L ] ;
-+  first_free_baking_slot = 16 ;
-   max_signing_slot = 15 ;
+   first_free_baking_slot = 16 ;
+   endorsers_per_block = 32 ;
    max_gas = 40_000 ;
-   proof_of_work_threshold =
diff --git a/scripts/alphanet_version b/scripts/alphanet_version
index 895f33ea0..e29ac90f8 100644
--- a/scripts/alphanet_version
+++ b/scripts/alphanet_version
@@ -1 +1 @@
-2018-03-09T13:05:42Z
+2018-03-18T17:36:14Z
diff --git a/src/bin_node/node_run_command.ml b/src/bin_node/node_run_command.ml
index fbc02a131..8c989d58b 100644
--- a/src/bin_node/node_run_command.ml
+++ b/src/bin_node/node_run_command.ml
@@ -11,10 +11,10 @@ open Logging.Node.Main
 
 let genesis : State.Chain.genesis = {
   time =
-    Time.of_notation_exn "2018-03-09T13:05:42Z" ;
+    Time.of_notation_exn "2018-03-18T17:36:14Z" ;
   block =
     Block_hash.of_b58check_exn
-      "BLockGenesisGenesisGenesisGenesisGenesis1962feAyDRw" ;
+      "BLockGenesisGenesisGenesisGenesisGenesisd83c5erKDpS" ;
   protocol =
     Protocol_hash.of_b58check_exn
       "ProtoGenesisGenesisGenesisGenesisGenesisGenesk612im" ;
diff --git a/src/lib_shell/distributed_db_message.ml b/src/lib_shell/distributed_db_message.ml
index 20eed6f08..aaa9a563e 100644
--- a/src/lib_shell/distributed_db_message.ml
+++ b/src/lib_shell/distributed_db_message.ml
@@ -170,7 +170,7 @@ let encoding =
 
 let versions =
   let open P2p_version in
-  [ { name = "TEZOS_2018-03-09T13:05:42Z" ;
+  [ { name = "TEZOS_2018-03-18T17:36:14Z" ;
       major = 0 ;
       minor = 0 ;
     }