diff --git a/dune-project b/dune-project
index f0bf3753..dbe3fe81 100644
--- a/dune-project
+++ b/dune-project
@@ -30,7 +30,7 @@
   (fmt (>= 0.8.9))
   logs
   (cmdliner (>= 1.2.0))
-  (tar-unix (>= 2.4.0))
+  (tar-unix (and (>= 2.4.0) (< 3.0.0)))
   (yojson (>= 1.6.0))
   sexplib
   ppx_deriving
diff --git a/obuilder.opam b/obuilder.opam
index d9e94f7d..8e3b9170 100644
--- a/obuilder.opam
+++ b/obuilder.opam
@@ -30,7 +30,7 @@ depends: [
   "fmt" {>= "0.8.9"}
   "logs"
   "cmdliner" {>= "1.2.0"}
-  "tar-unix" {>= "2.4.0"}
+  "tar-unix" {>= "2.4.0" & < "3.0.0"}
   "yojson" {>= "1.6.0"}
   "sexplib"
   "ppx_deriving"