diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e44118b..19c85ba 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
           # - macos-latest    # build issues with `ar` (!!!)
           #- windows-latest   # certificate problem
         ocaml-compiler:
-          - '4.08'
+          - '4.11'
           - '4.14'
           - '5.3'
     runs-on: ${{ matrix.os }}
diff --git a/dune-project b/dune-project
index e141877..a82d686 100644
--- a/dune-project
+++ b/dune-project
@@ -25,7 +25,7 @@
   (odoc :with-doc)
   (tiny_httpd (and (>= 0.19) :with-test))
   (ocaml
-   (>= 4.03))))
+   (>= 4.11))))
 
 (package
  (name ezcurl-lwt)
@@ -37,6 +37,4 @@
    (= :version))
   lwt
   (mdx :with-test)
-  (odoc :with-doc)
-  (ocaml
-   (>= 4.03))))
+  (odoc :with-doc)))
diff --git a/ezcurl-lwt.opam b/ezcurl-lwt.opam
index bc323b3..e79ea2c 100644
--- a/ezcurl-lwt.opam
+++ b/ezcurl-lwt.opam
@@ -15,7 +15,6 @@ depends: [
   "lwt"
   "mdx" {with-test}
   "odoc" {with-doc}
-  "ocaml" {>= "4.03"}
 ]
 build: [
   ["dune" "subst"] {dev}
diff --git a/ezcurl.opam b/ezcurl.opam
index 457e3b0..14e3bb6 100644
--- a/ezcurl.opam
+++ b/ezcurl.opam
@@ -14,7 +14,7 @@ depends: [
   "curl" {>= "0.8"}
   "odoc" {with-doc}
   "tiny_httpd" {>= "0.19" & with-test}
-  "ocaml" {>= "4.03"}
+  "ocaml" {>= "4.11"}
 ]
 build: [
   ["dune" "subst"] {dev}