diff --git a/dune-project b/dune-project
index 5c32ef3df..155175330 100644
--- a/dune-project
+++ b/dune-project
@@ -26,10 +26,11 @@
 
 (package
  (name lwt_ppx)
+ (version dev)
  (synopsis "PPX syntax for Lwt, providing something similar to async/await from JavaScript")
  (depends
   (ocaml (>= 4.08))
-  (ppxlib (>= 0.16.0))
+  (ppxlib (and (>= 0.16.0) (< 0.36)))
   (ppx_let :with-test)
   (bisect_ppx :with-test)
   lwt))
@@ -46,6 +47,7 @@
 
 (package
  (name lwt)
+ (version dev)
  (synopsis "Promises and event-driven I/O")
  (description "A promise is a value that may become determined in the future.
 
diff --git a/lwt.opam b/lwt.opam
index 6019f80d1..8380e6d5a 100644
--- a/lwt.opam
+++ b/lwt.opam
@@ -1,5 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
+version: "dev"
 synopsis: "Promises and event-driven I/O"
 description: """
 A promise is a value that may become determined in the future.
diff --git a/lwt_ppx.opam b/lwt_ppx.opam
index 57b2c210f..ad6249c2b 100644
--- a/lwt_ppx.opam
+++ b/lwt_ppx.opam
@@ -1,5 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
+version: "dev"
 synopsis:
   "PPX syntax for Lwt, providing something similar to async/await from JavaScript"
 maintainer: [
@@ -13,7 +14,7 @@ bug-reports: "https://github.com/ocsigen/lwt/issues"
 depends: [
   "dune" {>= "2.7"}
   "ocaml" {>= "4.08"}
-  "ppxlib" {>= "0.16.0"}
+  "ppxlib" {>= "0.16.0" & < "0.36"}
   "ppx_let" {with-test}
   "bisect_ppx" {with-test}
   "lwt"