diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4a755a59..49c287ce 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,7 +17,7 @@ jobs:
             #- macos-latest
             #- windows-latest
         ocaml-compiler:
-          - 4.04
+          - 4.05
           - 4.14
 
     runs-on: ${{ matrix.os }}
diff --git a/tiny_httpd.opam b/tiny_httpd.opam
index 083cad56..367c6d12 100644
--- a/tiny_httpd.opam
+++ b/tiny_httpd.opam
@@ -14,7 +14,7 @@ depends: [
   "base-threads"
   "result"
   "seq"
-  "ocaml" { >= "4.04.0" }
+  "ocaml" { >= "4.05.0" }
   "odoc" {with-doc}
   "conf-libcurl" {with-test}
   "qcheck-core" {with-test & >= "0.9" }
diff --git a/tiny_httpd_camlzip.opam b/tiny_httpd_camlzip.opam
index 93be4bd0..a6ca34f9 100644
--- a/tiny_httpd_camlzip.opam
+++ b/tiny_httpd_camlzip.opam
@@ -13,7 +13,7 @@ depends: [
   "dune" { >= "2.0" }
   "camlzip" {>= "1.06"}
   "tiny_httpd" { = version }
-  "ocaml" { >= "4.04.0" }
+  "ocaml" { >= "4.05.0" }
   "odoc" {with-doc}
 ]
 tags: [ "http" "thread" "server" "gzip" "camlzip" ]