diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 506ae9df..a70fd23e 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -1,5 +1,20 @@
 = Changelog
 
+== 0.21
+
+- (breaking) make default `start`/`stop` arguments empty in printers (#82)
+
+- add `CCFormat.{with_color_sf,fprintf_dyn_color,sprintf_dyn_color}`
+- add `CCFormat.Dump` for easy debugging (see #82)
+- add `CCArray.Sub.to_list`
+- add `CCArray.{sorted,sort_indices,sort_ranking}` (closes #81)
+
+- handle '\r` in CCSexpM (fixes #83)
+- add alias `Containers.IO`
+- bugfixes in `CCArray.Sub`
+- bugfix + tests for `CCArray.Sub.sub`
+- disable parallel build to support cygwin
+
 == 0.20
 
 - bugfix in `CCArray.equal`
diff --git a/_oasis b/_oasis
index 82ecf65e..4ca0a03c 100644
--- a/_oasis
+++ b/_oasis
@@ -1,6 +1,6 @@
 OASISFormat: 0.4
 Name:        containers
-Version:     0.20
+Version:     0.21
 Homepage:    https://github.com/c-cube/ocaml-containers
 Authors:     Simon Cruanes
 License:     BSD-2-clause
diff --git a/src/core/CCArray.ml b/src/core/CCArray.ml
index 427ccf7b..f881489e 100644
--- a/src/core/CCArray.ml
+++ b/src/core/CCArray.ml
@@ -53,14 +53,14 @@ module type S = sig
 
   val sorted : ('a -> 'a -> int) -> 'a t -> 'a array
   (** [sorted cmp a] makes a copy of [a] and sorts it with [cmp].
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val sort_indices : ('a -> 'a -> int) -> 'a t -> int array
   (** [sort_indices cmp a] returns a new array [b], with the same length as [a],
       such that [b.(i)] is the index of the [i]-th element of [a] in [sort cmp a].
       In other words, [map (fun i -> a.(i)) (sort_indices a) = sorted cmp a].
       [a] is not modified.
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array
   (** [sort_ranking cmp a] returns a new array [b], with the same length as [a],
@@ -72,7 +72,7 @@ module type S = sig
 
       Without duplicates, we also have
       [lookup_exn a.(i) (sorted a) = (sorted_ranking a).(i)]
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val find : ('a -> 'b option) -> 'a t -> 'b option
   (** [find f a] returns [Some y] if there is an element [x] such
diff --git a/src/core/CCArray.mli b/src/core/CCArray.mli
index 44f7cc7b..11be5ebd 100644
--- a/src/core/CCArray.mli
+++ b/src/core/CCArray.mli
@@ -55,14 +55,14 @@ module type S = sig
 
   val sorted : ('a -> 'a -> int) -> 'a t -> 'a array
   (** [sorted cmp a] makes a copy of [a] and sorts it with [cmp].
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val sort_indices : ('a -> 'a -> int) -> 'a t -> int array
   (** [sort_indices cmp a] returns a new array [b], with the same length as [a],
       such that [b.(i)] is the index of the [i]-th element of [a] in [sort cmp a].
       In other words, [map (fun i -> a.(i)) (sort_indices a) = sorted cmp a].
       [a] is not modified.
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array
   (** [sort_ranking cmp a] returns a new array [b], with the same length as [a],
@@ -74,7 +74,7 @@ module type S = sig
 
       Without duplicates, we also have
       [lookup_exn a.(i) (sorted a) = (sorted_ranking a).(i)]
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val find : ('a -> 'b option) -> 'a t -> 'b option
   (** [find f a] returns [Some y] if there is an element [x] such
@@ -249,7 +249,7 @@ module Sub : sig
 
   val to_list : 'a t -> 'a list
   (** Convert directly to a list
-      @since NEXT_RELEASE *)
+      @since 0.21 *)
 
   val full : 'a array -> 'a t
   (** Slice that covers the full array *)
diff --git a/src/core/CCFormat.mli b/src/core/CCFormat.mli
index ec7c6efd..98ddcc46 100644
--- a/src/core/CCFormat.mli
+++ b/src/core/CCFormat.mli
@@ -145,7 +145,7 @@ val with_color_sf : string -> ('a, t, unit, string) format4 -> 'a
       CCFormat.with_color_sf "red" "%a" CCFormat.Dump.(list int) [1;2;3] |> print_endline;;
     ]}
     {b status: experimental}
-    @since NEXT_RELEASE *)
+    @since 0.21 *)
 
 (** {2 IO} *)
 
@@ -175,7 +175,7 @@ val sprintf_dyn_color : colors:bool -> ('a, t, unit, string) format4 -> 'a
       CCFormat.sprintf_dyn_color ~colors:false "@{<Red>%a@}"
         CCFormat.Dump.(list int) [1;2;3] |> print_endline;;
     ]}
-    @since NEXT_RELEASE *)
+    @since 0.21 *)
 
 val fprintf : t -> ('a, t, unit ) format -> 'a
 (** Alias to {!Format.fprintf}
@@ -183,7 +183,7 @@ val fprintf : t -> ('a, t, unit ) format -> 'a
 
 val fprintf_dyn_color : colors:bool -> t -> ('a, t, unit ) format -> 'a
 (** Similar to {!fprintf} but enable/disable colors depending on [colors]
-    @since NEXT_RELEASE *)
+    @since 0.21 *)
 
 val ksprintf :
   f:(string -> 'b) ->
@@ -214,7 +214,7 @@ val to_file : string -> ('a, t, unit, unit) format4 -> 'a
         [| [1, true; 2, false]; []; [42, false] |];;
     ]}
 
-    @since NEXT_RELEASE *)
+    @since 0.21 *)
 
 module Dump : sig
   type 'a t = 'a printer
diff --git a/src/core/containers.ml b/src/core/containers.ml
index 829c1f11..470bae8f 100644
--- a/src/core/containers.ml
+++ b/src/core/containers.ml
@@ -82,7 +82,7 @@ module Int64 = CCInt64
 (** @since 0.13 *)
 
 module IO = CCIO
-(** @since NEXT_RELEASE *)
+(** @since 0.21 *)
 
 module Char = struct
   include Char