diff --git a/httpaf-async.opam b/httpaf-async.opam
index 647c28f5..ae500fa7 100644
--- a/httpaf-async.opam
+++ b/httpaf-async.opam
@@ -1,3 +1,4 @@
+version: "0.5.0"
 opam-version: "2.0"
 name: "httpaf-async"
 maintainer: "Spiros Eliopoulos <spiros@inhabitedtype.com>"
diff --git a/httpaf.opam b/httpaf.opam
index d4ae80a7..7f4aa4ac 100644
--- a/httpaf.opam
+++ b/httpaf.opam
@@ -1,3 +1,4 @@
+version: "0.5.0"
 opam-version: "2.0"
 maintainer: "Spiros Eliopoulos <spiros@inhabitedtype.com>"
 authors: [ "Spiros Eliopoulos <spiros@inhabitedtype.com>" ]