diff --git a/dune-project b/dune-project
index 64cc649..d6718c6 100644
--- a/dune-project
+++ b/dune-project
@@ -1,3 +1,5 @@
 (lang dune 1.11)
-(implicit_transitive_deps true) ; Change to false once in a while to see what we are really using
-                                ; Too fragile to turn off by default though
+
+; Change to false once in a while to see what we are really using
+; Too fragile to turn off by default though
+(implicit_transitive_deps true)
diff --git a/opam-health-check.opam b/opam-health-check.opam
index 425aa64..5f29ff3 100644
--- a/opam-health-check.opam
+++ b/opam-health-check.opam
@@ -12,7 +12,7 @@ tags: ["opam" "check"]
 build: ["dune" "build" "-p" name "-j" jobs]
 depends: [
   "ocaml" {>= "4.10.0"}
-  "dune" {>= "1.0"}
+  "dune" {>= "1.11"}
   "tyxml" {>= "4.3.0"}
   "cohttp"
   "cohttp-lwt"
@@ -26,7 +26,7 @@ depends: [
   "mirage-crypto-rng" {>= "0.11.0"}
   "mirage-crypto-rng-lwt" {>= "0.11.0"}
   "cmdliner" {>= "1.1.0"}
-  "prometheus-app"
+  "prometheus-app" {>= "1.2"}
   "fpath"
   "fmt" {>= "0.8.7"}
   "re" {>= "1.7.2"}
@@ -46,8 +46,8 @@ depends: [
   "lwt"
   "lwt_ppx"
   "uri"
-  "docker_hub" {>= "0.1.0"}
-  "memtrace"
+  "docker_hub" {>= "0.1.0" & < "0.2.0"}
+  "memtrace" {>= "0.2.3"}
   "tls-lwt" {>= "0.16.0"} # activate conduit with TLS for slack webhooks
   "conf-libev" # Required for lwt to avoid hitting the limits of select(2)
   "conf-pixz" # TODO: Make it a library