diff --git a/dune-project b/dune-project
index e6f6ab9..4d033d2 100644
--- a/dune-project
+++ b/dune-project
@@ -24,7 +24,7 @@
    (qcheck :with-test)
    (qcheck-alcotest :with-test)
    ppx_expect
-   (mdx (and :with-test (= 2.5.0)))
+   (mdx (= 2.5.0))
    (ocamlformat :with-dev-setup)
    (ocp-indent :with-dev-setup)
    (merlin :with-dev-setup)
diff --git a/yocaml.opam b/yocaml.opam
index 37db8b4..4a7a290 100644
--- a/yocaml.opam
+++ b/yocaml.opam
@@ -18,7 +18,7 @@ depends: [
   "qcheck" {with-test}
   "qcheck-alcotest" {with-test}
   "ppx_expect"
-  "mdx" {with-test & = "2.5.0"}
+  "mdx" {= "2.5.0"}
   "ocamlformat" {with-dev-setup}
   "ocp-indent" {with-dev-setup}
   "merlin" {with-dev-setup}