diff --git a/Makefile b/Makefile
index c87f00c59..70e3c882f 100644
--- a/Makefile
+++ b/Makefile
@@ -29,10 +29,6 @@ opam-create-switch: ## Create opam switch
 
 .PHONY: opam-install-test
 opam-install-test: ## Install test dependencies
-	opam pin add js_of_ocaml-compiler --dev-repo -y
-	opam pin add js_of_ocaml --dev-repo -y
-	opam pin add merlin-lib git+https://github.com/voodoos/merlin#5.1.1-upgrade
-	opam pin add merlin git+https://github.com/voodoos/merlin#5.1.1-upgrade
 	opam pin add melange.dev . --with-test -y
 	opam pin add melange-playground.dev . --with-test -y
 
diff --git a/melange.opam b/melange.opam
index 5a74f3026..5573c9351 100644
--- a/melange.opam
+++ b/melange.opam
@@ -36,3 +36,9 @@ build: [
   ]
 ]
 dev-repo: "git+https://github.com/melange-re/melange.git"
+pin-depends: [
+  [ "js_of_ocaml-compiler.dev" "https://github.com/ocsigen/js_of_ocaml/archive/31e5d22f96435e511c8bd6e2a6d43f7c5fb13dec.tar.gz" ]
+  [ "js_of_ocaml.dev" "https://github.com/ocsigen/js_of_ocaml/archive/31e5d22f96435e511c8bd6e2a6d43f7c5fb13dec.tar.gz" ]
+  [ "merlin-lib.dev" "https://github.com/voodoos/merlin/archive/15491d05db13ec6beaf3c84632914c29b674270d.tar.gz" ]
+  [ "merlin.dev" "https://github.com/voodoos/merlin/archive/15491d05db13ec6beaf3c84632914c29b674270d.tar.gz" ]
+]
diff --git a/melange.opam.template b/melange.opam.template
new file mode 100644
index 000000000..47b6ba86b
--- /dev/null
+++ b/melange.opam.template
@@ -0,0 +1,6 @@
+pin-depends: [
+  [ "js_of_ocaml-compiler.dev" "https://github.com/ocsigen/js_of_ocaml/archive/31e5d22f96435e511c8bd6e2a6d43f7c5fb13dec.tar.gz" ]
+  [ "js_of_ocaml.dev" "https://github.com/ocsigen/js_of_ocaml/archive/31e5d22f96435e511c8bd6e2a6d43f7c5fb13dec.tar.gz" ]
+  [ "merlin-lib.dev" "https://github.com/voodoos/merlin/archive/15491d05db13ec6beaf3c84632914c29b674270d.tar.gz" ]
+  [ "merlin.dev" "https://github.com/voodoos/merlin/archive/15491d05db13ec6beaf3c84632914c29b674270d.tar.gz" ]
+]