diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 9db37954a..ff5ac1db3 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -1,5 +1,34 @@
 = Changelog
 
+== 2.4
+
+=== breaking:
+
+- rename `Random.sample_without_{replacement,duplicates}`
+
+=== Features
+
+- add `CCResult.iter_err`
+- add `CCEqual.{always,never}_eq`
+- add `containersLabels.ml`, generate unlabelled interfaces from labelled ones
+- add `CCEqualLabels`
+- add `CCArray_sliceLabels`
+- add `CCStringLabels`
+- add `CCResult.get_or_failwith`
+- add `CCInt.( ** )` for integer exponentiation
+- add `List.counts`, related to `List.count` (#230)
+
+- migrate to dune
+- migrate to opam2
+- add CODE_OF_CONDUCT.md
+
+=== Fixes
+
+- #235: release memory in vector/ringbuffer (thanks to @copy)
+- remove spurious `Labels` module
+- doc: fix small inaccuracy in comments and API
+- test: improve perf by changing random gens
+
 == 2.3
 
 - feat(vector): add `Vector.{filter,filter_map}_in_place`
diff --git a/containers.opam b/containers.opam
index 4d2d5f4cd..590e4d9d0 100644
--- a/containers.opam
+++ b/containers.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "containers"
-version: "2.3"
+version: "2.4"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 synopsis: "A modular, clean and powerful extension of the OCaml standard library"
diff --git a/src/core/CCInt.mli b/src/core/CCInt.mli
index c57fc9603..398d9c29c 100644
--- a/src/core/CCInt.mli
+++ b/src/core/CCInt.mli
@@ -126,7 +126,7 @@ module Infix : sig
 
   val (/) : t -> t -> t (** @since 2.1 *)
 
-  val ( ** ) : t -> t -> t (** @since NEXT_RELEASE *)
+  val ( ** ) : t -> t -> t (** @since 2.4 *)
 
   val (mod) : t -> t -> t (** @since 2.1 *)
 
diff --git a/src/core/CCList.mli b/src/core/CCList.mli
index 7f4719b29..f2ab25cd5 100644
--- a/src/core/CCList.mli
+++ b/src/core/CCList.mli
@@ -94,7 +94,7 @@ val count : ('a -> bool) -> 'a list -> int
     @since 2.2 with labels *)
 
 val count_true_false : ('a -> bool) -> 'a list -> int * int
-(** @since NEXT_RELEASE *)
+(** @since 2.4 *)
 
 val init : int -> (int -> 'a) -> 'a t
 (** [init len f] is [f 0; f 1; ...; f (len-1)].
diff --git a/src/core/CCListLabels.mli b/src/core/CCListLabels.mli
index 75f34ef51..ce373ff31 100644
--- a/src/core/CCListLabels.mli
+++ b/src/core/CCListLabels.mli
@@ -92,7 +92,7 @@ val count : f:('a -> bool) -> 'a list -> int
     @since 2.2 with labels *)
 
 val count_true_false : f:('a -> bool) -> 'a list -> int * int
-(** @since NEXT_RELEASE *)
+(** @since 2.4 *)
 
 val init : int -> f:(int -> 'a) -> 'a t
 (** [init len ~f] is [f 0; f 1; ...; f (len-1)].
diff --git a/src/core/CCRandom.mli b/src/core/CCRandom.mli
index c52852d58..e609aa462 100644
--- a/src/core/CCRandom.mli
+++ b/src/core/CCRandom.mli
@@ -74,7 +74,7 @@ val sample_without_duplicates:
     generated randomly using [g] with the added constraint that none of the generated
     random values are equal.
     @raise Invalid_argument if [n <= 0].
-    @since NEXT_RELEASE *)
+    @since 2.4 *)
 
 val list_seq : 'a t list -> 'a list t
 (** Build random lists from lists of random generators.
diff --git a/src/core/CCResult.mli b/src/core/CCResult.mli
index 6e4f23331..a5b47bb6f 100644
--- a/src/core/CCResult.mli
+++ b/src/core/CCResult.mli
@@ -75,7 +75,7 @@ val iter : ('a -> unit) -> ('a, _) t -> unit
 
 val iter_err : ('err -> unit) -> (_, 'err) t -> unit
 (** Apply the function in case of [Error].
-    @since NEXT_RELEASE *)
+    @since 2.4 *)
 
 exception Get_error
 
@@ -91,7 +91,7 @@ val get_or : ('a, _) t -> default:'a -> 'a
 val get_or_failwith : ('a, string) t -> 'a
 (** [get_or_failwith e] returns [x] if [e = Ok x], fails otherwise.
     @raise Failure with [msg] if [e = Error msg].
-    @since NEXT_RELEASE *)
+    @since 2.4 *)
 
 val map_or : ('a -> 'b) ->  ('a, 'c) t -> default:'b -> 'b
 (** [map_or f e ~default] returns [f x] if [e = Ok x], [default] otherwise. *)
diff --git a/src/core/CCVector.mli b/src/core/CCVector.mli
index 72f66863c..42f4bd4e6 100644
--- a/src/core/CCVector.mli
+++ b/src/core/CCVector.mli
@@ -280,7 +280,7 @@ val fill_empty_slots_with : ('a, _) t -> 'a -> unit
     array that are not used (ie in the last [capacity v - length v] slots).
     This is useful if you removed some elements from the vector and
     want to be sure they can be GC'd by erasing them from the vector.
-    @since NEXT_RELEASE *)
+    @since 2.4 *)
 
 val of_klist : ?init:('a, rw) t -> 'a klist -> ('a, rw) t
 val to_klist : ('a,_) t -> 'a klist
diff --git a/src/data/CCRingBuffer.ml b/src/data/CCRingBuffer.ml
index 4970b4805..808f1c95e 100644
--- a/src/data/CCRingBuffer.ml
+++ b/src/data/CCRingBuffer.ml
@@ -20,7 +20,7 @@ module Array = struct
 
     val dummy : elt
     (** A dummy element used for empty slots in the array
-        @since NEXT_RELEASE *)
+        @since 2.4 *)
 
     val create : int -> t
     (** Make an array of the given size, filled with dummy elements *)
diff --git a/src/data/CCRingBuffer.mli b/src/data/CCRingBuffer.mli
index bb2b4f2f3..66a568525 100644
--- a/src/data/CCRingBuffer.mli
+++ b/src/data/CCRingBuffer.mli
@@ -28,7 +28,7 @@ module Array : sig
 
     val dummy : elt
     (** A dummy element used for empty slots in the array
-        @since NEXT_RELEASE *)
+        @since 2.4 *)
 
     val create : int -> t
     (** Make an array of the given size, filled with dummy elements. *)