diff --git a/cerberus-absint.opam b/cerberus-absint.opam
index e69de29bb..d26f3f6e1 100644
--- a/cerberus-absint.opam
+++ b/cerberus-absint.opam
@@ -0,0 +1 @@
+opam-version: "2.0"
\ No newline at end of file
diff --git a/cerberus-ocaml.opam b/cerberus-ocaml.opam
index e69de29bb..d26f3f6e1 100644
--- a/cerberus-ocaml.opam
+++ b/cerberus-ocaml.opam
@@ -0,0 +1 @@
+opam-version: "2.0"
\ No newline at end of file
diff --git a/rustic.opam b/rustic.opam
index e69de29bb..d26f3f6e1 100644
--- a/rustic.opam
+++ b/rustic.opam
@@ -0,0 +1 @@
+opam-version: "2.0"
\ No newline at end of file