diff --git a/scripts/lobby.gd b/scripts/lobby.gd
index 33b258b..66282a3 100644
--- a/scripts/lobby.gd
+++ b/scripts/lobby.gd
@@ -38,8 +38,6 @@ func option_sel(button_name, option):
 
 func _ready():
 
-	my_info.version = [0,0,0] # Semantic versioning: [0].[1].[2]
-
 	randomize()
 
 	get_node("GameBrowser/Play").connect("pressed", self, "connect_global_server")
@@ -136,8 +134,14 @@ func collect_info():
 		my_info.hero = get_node("PlayerSettings/HeroSelect").get_selected_id()
 	if not "is_right_team" in my_info:
 		my_info.is_right_team = false # Server assigns team, wait for that
+	my_info.version = version
 
 remote func register_player(new_peer, info):
+	var p_version = info.version.split(".")
+	var version_split = util.version.split(".")
+	if p_version[0] != version_split[0]:
+		# TODO: Fail gracefully
+		return
 	player_info[new_peer] = info
 	render_player_list()
 	if (get_tree().is_network_server()):
diff --git a/scripts/util.gd b/scripts/util.gd
index 3f49fa8..bd547fe 100644
--- a/scripts/util.gd
+++ b/scripts/util.gd
@@ -1,5 +1,15 @@
 extends Node
 
+# Semantic versioning, more or less
+# Major: Server cannot accept requests (i.e. new hero, or network protocol change)
+# Minor: Gameplay was significantly changed, but these can still technically play together (i.e. master-only scope added)
+	# These are things a server admin might choose to reject if it was decided to be significant
+# Patch: Anything else: Bugfixes, UI changes, etc
+# Currently 0.0.0 which means API, gameplay, etc can change suddenly and frequently
+# Don't rely on it for anything
+# 1.0.0 will be the reddit release
+var version = "0.0.0"
+
 func get_master_player():
 	var path = "/root/Level/Players/%d" % get_tree().get_network_unique_id()
 	if has_node(path):
@@ -10,7 +20,7 @@ func get_master_player():
 func is_friendly(player):
 	var mp = get_master_player()
 	if mp:
-		return player.player_info.is_right_team == get_master_player().player_info.is_right_team
+		return player.player_info.is_right_team == mp.player_info.is_right_team
 	else:
 		return true # Doesn't matter, we're headless