diff --git a/gencapdefs.py b/gencapdefs.py
index 8c49fc46..a89dcb9d 100644
--- a/gencapdefs.py
+++ b/gencapdefs.py
@@ -135,36 +135,12 @@ CAPDEFS = [
         url="https://ircv3.net/specs/extensions/userhost-in-names-3.2.html",
         standard="IRCv3",
     ),
-    CapDef(
-        identifier="ZNCSelfMessage",
-        name="znc.in/self-message",
-        url="https://wiki.znc.in/Query_buffers",
-        standard="ZNC vendor",
-    ),
-    CapDef(
-        identifier="EventPlayback",
-        name="draft/event-playback",
-        url="https://github.com/ircv3/ircv3-specifications/pull/362",
-        standard="proposed IRCv3",
-    ),
-    CapDef(
-        identifier="ZNCPlayback",
-        name="znc.in/playback",
-        url="https://wiki.znc.in/Playback",
-        standard="ZNC vendor",
-    ),
     CapDef(
         identifier="Multiline",
         name="draft/multiline",
         url="https://github.com/ircv3/ircv3-specifications/pull/398",
         standard="proposed IRCv3",
     ),
-    CapDef(
-        identifier="Chathistory",
-        name="draft/chathistory",
-        url="https://github.com/ircv3/ircv3-specifications/pull/393",
-        standard="proposed IRCv3",
-    ),
     CapDef(
         identifier="AccountRegistration",
         name="draft/account-registration",
diff --git a/irc/caps/defs.go b/irc/caps/defs.go
index 2b315c88..1b8b8b63 100644
--- a/irc/caps/defs.go
+++ b/irc/caps/defs.go
@@ -7,7 +7,7 @@ package caps
 
 const (
 	// number of recognized capabilities:
-	numCapabs = 27
+	numCapabs = 23
 	// length of the uint64 array that represents the bitset:
 	bitsetLen = 1
 )
@@ -45,14 +45,6 @@ const (
 	// https://ircv3.net/specs/extensions/channel-rename
 	ChannelRename Capability = iota
 
-	// Chathistory is the proposed IRCv3 capability named "draft/chathistory":
-	// https://github.com/ircv3/ircv3-specifications/pull/393
-	Chathistory Capability = iota
-
-	// EventPlayback is the proposed IRCv3 capability named "draft/event-playback":
-	// https://github.com/ircv3/ircv3-specifications/pull/362
-	EventPlayback Capability = iota
-
 	// ExtendedMonitor is the draft IRCv3 capability named "draft/extended-monitor":
 	// https://github.com/ircv3/ircv3-specifications/pull/466
 	ExtendedMonitor Capability = iota
@@ -125,8 +117,6 @@ var (
 		"chghost",
 		"draft/account-registration",
 		"draft/channel-rename",
-		"draft/chathistory",
-		"draft/event-playback",
 		"draft/extended-monitor",
 		"draft/languages",
 		"draft/multiline",
diff --git a/irc/config.go b/irc/config.go
index 96b67830..325dda0b 100644
--- a/irc/config.go
+++ b/irc/config.go
@@ -603,7 +603,6 @@ type Config struct {
 		ClientLength     int              `yaml:"client-length"`
 		AutoresizeWindow custime.Duration `yaml:"autoresize-window"`
 		AutoreplayOnJoin int              `yaml:"autoreplay-on-join"`
-		ChathistoryMax   int              `yaml:"chathistory-maxmessages"`
 		ZNCMax           int              `yaml:"znc-maxmessages"`
 		Restrictions     struct {
 			ExpireTime custime.Duration `yaml:"expire-time"`
@@ -1406,8 +1405,6 @@ func LoadConfig(filename string) (config *Config, err error) {
 	// of this detail
 	config.History.ChannelLength = 0
 	config.History.ClientLength = 0
-	config.Server.supportedCaps.Disable(caps.Chathistory)
-	config.Server.supportedCaps.Disable(caps.EventPlayback)
 	config.History.Persistent.Enabled = false
 	config.History.Persistent.UnregisteredChannels = false
 	config.History.Persistent.RegisteredChannels = PersistentDisabled