diff --git a/containers-data.opam b/containers-data.opam
index cce5f9e3..1861d222 100644
--- a/containers-data.opam
+++ b/containers-data.opam
@@ -10,12 +10,10 @@ build: [
   ["dune" "runtest" "-p" name "-j" jobs] {with-test & arch != "x86_32" & arch != "arm32"}
 ]
 depends: [
-  "ocaml" { >= "4.03.0" }
+  "ocaml" { >= "4.08.0" }
   "dune" { >= "2.0" }
   "containers" { = version }
-  "seq"
-  (("ocaml" {with-test & < "4.08"} & "qcheck-core" {>= "0.17" & with-test})
-  | ("ocaml" {with-test & >= "4.08"} & "qcheck-core" {>= "0.20" & with-test}))
+| "qcheck-core" {>= "0.20" & with-test}
   "iter" { with-test }
   "gen" { with-test }
   "mdx" { with-test }
diff --git a/containers-thread.opam b/containers-thread.opam
index b388c91a..79ea3867 100644
--- a/containers-thread.opam
+++ b/containers-thread.opam
@@ -10,14 +10,13 @@ build: [
   ["dune" "runtest" "-p" name "-j" jobs] {with-test}
 ]
 depends: [
-  "ocaml" { >= "4.03.0" }
+  "ocaml" { >= "4.08.0" }
   "dune" { >= "2.0" }
   "base-threads"
   "dune-configurator"
   "containers" { = version }
   "iter" { with-test }
-  (("ocaml" {with-test & < "4.08"} & "qcheck-core" {>= "0.17" & with-test})
-  | ("ocaml" {with-test & >= "4.08"} & "qcheck-core" {>= "0.18" & with-test}))
+  "qcheck-core" {>= "0.18" & with-test}
   "uutf" { with-test }
   "odoc" { with-doc }
 ]
diff --git a/containers.opam b/containers.opam
index a6fe0098..c473da06 100644
--- a/containers.opam
+++ b/containers.opam
@@ -11,13 +11,11 @@ build: [
   ["dune" "runtest" "-p" name "-j" jobs] {with-test & arch != "x86_32" & arch != "arm32"}
 ]
 depends: [
-  "ocaml" { >= "4.03.0" }
+  "ocaml" { >= "4.08.0" }
   "dune" { >= "2.0" }
   "dune-configurator"
-  "seq" # compat
   "either" # compat
-  (("ocaml" {with-test & < "4.08"} & "qcheck-core" {>= "0.17" & with-test})
-  | ("ocaml" {with-test & >= "4.08"} & "qcheck-core" {>= "0.18" & with-test}))
+| "qcheck-core" {>= "0.18" & with-test}
   "yojson" { with-test }
   "iter" { with-test }
   "gen" { with-test }