diff --git a/src/client/opamArg.mli b/src/client/opamArg.mli
index 9b205ee31a2..3c47a8b0057 100644
--- a/src/client/opamArg.mli
+++ b/src/client/opamArg.mli
@@ -25,6 +25,7 @@ val cli2_0: OpamCLIVersion.t
 val cli2_1: OpamCLIVersion.t
 val cli2_2: OpamCLIVersion.t
 val cli2_3: OpamCLIVersion.t
+val cli2_4: OpamCLIVersion.t
 
 (* [cli_from ?platform ?experimental since] validity flag since [since], and no
    removal version. If [experimental] is true, it is marked as is (warning and
diff --git a/src/client/opamArgTools.ml b/src/client/opamArgTools.ml
index 41eaec82593..6915a8679c1 100644
--- a/src/client/opamArgTools.ml
+++ b/src/client/opamArgTools.ml
@@ -16,6 +16,7 @@ let cli2_0 = OpamCLIVersion.of_string "2.0"
 let cli2_1 = OpamCLIVersion.of_string "2.1"
 let cli2_2 = OpamCLIVersion.of_string "2.2"
 let cli2_3 = OpamCLIVersion.of_string "2.3"
+let cli2_4 = OpamCLIVersion.of_string "2.4"
 
 type subplatform = [ `windows | `unix ]
 type platform = [ `all | subplatform ]
diff --git a/src/client/opamArgTools.mli b/src/client/opamArgTools.mli
index 6b8a093247f..95dfbd817be 100644
--- a/src/client/opamArgTools.mli
+++ b/src/client/opamArgTools.mli
@@ -29,6 +29,7 @@ val cli2_0: OpamCLIVersion.t
 val cli2_1: OpamCLIVersion.t
 val cli2_2: OpamCLIVersion.t
 val cli2_3: OpamCLIVersion.t
+val cli2_4: OpamCLIVersion.t
 
 val mk_flag:
   cli:OpamCLIVersion.Sourced.t -> validity -> section:string -> string list ->