diff --git a/lib/cluster_build.ml b/lib/cluster_build.ml
index f9156f3..782648e 100644
--- a/lib/cluster_build.ml
+++ b/lib/cluster_build.ml
@@ -107,9 +107,9 @@ module Op = struct
       let base = Spec.base_to_string base in
       match ty with
       | `Opam (`List_revdeps { opam_version }, pkg) ->
-          Opam_build.revdeps ~for_docker ~opam_version ~base ~variant ~pkg
+          Opam_build.revdeps ~for_docker ~opam_version ~base ~variant pkg
       | `Opam (`Build { revdep; lower_bounds; with_tests; opam_version }, pkg) ->
-          Opam_build.spec ~for_docker ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_tests ~pkg
+          Opam_build.spec ~for_docker ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_tests pkg
     in
     Current.Job.write job
       (Fmt.str "@.\
diff --git a/lib/local_build.ml b/lib/local_build.ml
index 7a013a8..e88b3aa 100644
--- a/lib/local_build.ml
+++ b/lib/local_build.ml
@@ -77,6 +77,7 @@ module Op = struct
     master : Current_git.Commit.t;
     urgent : ([`High | `Low] -> bool) option;
     base : Spec.base;
+    test_config : Integration_test.t option;
   }
 
   let id = "ci-build"
@@ -138,7 +139,7 @@ module Op = struct
       end
     | _ -> Lwt_result.return ""
 
-  let build { config; master = _; urgent = _; base } job
+  let build { config; master = _; urgent = _; base; test_config } job
       { Key.commit; ty; variant } =
     let { docker_context; pool; build_timeout } = config in
     let os = match Variant.os variant with
@@ -148,9 +149,9 @@ module Op = struct
       let base = Spec.base_to_string base in
       match ty with
       | `Opam (`List_revdeps { opam_version }, pkg) ->
-          Opam_build.revdeps ~for_docker:true ~opam_version ~base ~variant ~pkg
+          Opam_build.revdeps ~test_config ~for_docker:true ~opam_version ~base ~variant pkg
       | `Opam (`Build { revdep; lower_bounds; with_tests; opam_version }, pkg) ->
-          Opam_build.spec ~for_docker:true ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_tests ~pkg
+          Opam_build.spec ~for_docker:true ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_tests pkg
     in
     let base =
       match base with
@@ -209,7 +210,7 @@ let v ?test_config ~label ~spec ~base ~master ~urgent commit =
   and> commit = Git.fetch commit
   and> master
   and> urgent in
-  let t = { Op.config = local_builder; master; urgent; base } in
+  let t = { Op.config = local_builder; master; urgent; base; test_config } in
   match test_config with
   | None ->
     BC.get t { commit; ty; variant }
@@ -236,7 +237,7 @@ let list_revdeps ?test_config ~variant ~opam_version ~pkgopt ~base ~master ~afte
   and> commit = Git.fetch commit
   and> master
   and> () = after in
-  let t = { Op.config = local_builder; master; urgent; base } in
+  let t = { Op.config = local_builder; master; urgent; base; test_config } in
   let ty = `Opam (`List_revdeps {Spec.opam_version}, pkg) in
   let f () =
     BC.get t { commit; ty; variant }
diff --git a/lib/opam_build.ml b/lib/opam_build.ml
index fea3a9b..1a3b5db 100644
--- a/lib/opam_build.ml
+++ b/lib/opam_build.ml
@@ -117,7 +117,7 @@ let setup_repository ~variant ~for_docker ~opam_version =
   (* TODO: MacOS seems to have a bug in (copy ...) so I am forced to remove the (workdir ...) here.
      Otherwise the "opam pin" after the "opam repository set-url" will fail (cannot find the new package for some reason) *)
   run "%s -f %s/bin/opam-%s %s/bin/opam" ln prefix opam_version_str prefix ::
-  run ~network "opam init --reinit%s -ni" opamrc :: (* TODO: Remove ~network when https://github.com/ocurrent/ocaml-dockerfile/pull/132 is merged *)
+  run "opam init --reinit%s -ni" opamrc ::
   run "uname -rs && opam exec -- ocaml -version && opam --version" ::
   env "OPAMDOWNLOADJOBS" "1" :: (* Try to avoid github spam detection *)
   env "OPAMERRLOGLEN" "0" :: (* Show the whole log if it fails *)
@@ -137,7 +137,7 @@ let set_personality ~variant =
   else
     []
 
-let spec ~for_docker ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_tests ~pkg =
+let spec ~for_docker ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_tests pkg =
   let opam_install = opam_install ~variant ~opam_version in
   let revdep = match revdep with
     | None -> []
@@ -159,11 +159,23 @@ let spec ~for_docker ~opam_version ~base ~variant ~revdep ~lower_bounds ~with_te
     @ tests
   )
 
-let revdeps ~for_docker ~opam_version ~base ~variant ~pkg =
+(* If we are integration-testing the revdeps, we replace the
+   existing opam-repository with a dummy one. However, this
+   removes the required base compiler packages. This command
+   pins them to keep them around.
+   Related: https://github.com/ocaml/opam/issues/5895 *)
+let keep_installed = function
+  | Some Integration_test.List_revdeps -> [
+      Obuilder_spec.run "for pkg in $(opam list -s --installed) ; do opam pin --current \"$pkg\" ; done"
+    ]
+  | _ -> []
+
+let revdeps ?(test_config=None) ~for_docker ~opam_version ~base ~variant pkg =
   let open Obuilder_spec in
   let pkg = Filename.quote (OpamPackage.to_string pkg) in
   Obuilder_spec.stage ~from:base (
     setup_repository ~variant ~for_docker ~opam_version
+    @ keep_installed test_config
     @ [
       run "echo '@@@OUTPUT' && \
            opam list -s --color=never --depends-on %s --coinstallable-with %s --installable --all-versions --depopts && \
diff --git a/lib/opam_build.mli b/lib/opam_build.mli
index e6619ac..c8e2906 100644
--- a/lib/opam_build.mli
+++ b/lib/opam_build.mli
@@ -6,13 +6,14 @@ val spec :
   revdep:OpamPackage.t option ->
   lower_bounds:bool ->
   with_tests:bool ->
-  pkg:OpamPackage.t ->
+  OpamPackage.t ->
   Obuilder_spec.t
 
 val revdeps :
+  ?test_config:Integration_test.t option ->
   for_docker:bool ->
   opam_version:[`V2_0 | `V2_1 | `Dev] ->
   base:string ->
   variant:Variant.t ->
-  pkg:OpamPackage.t ->
+  OpamPackage.t ->
   Obuilder_spec.t
diff --git a/test/patches/a-1-insignificant-change.patch b/test/patches/a-1-insignificant-change.patch
new file mode 100644
index 0000000..a69100f
--- /dev/null
+++ b/test/patches/a-1-insignificant-change.patch
@@ -0,0 +1,26 @@
+diff --git a/packages/a-1/a-1.0.0.1/opam b/packages/a-1/a-1.0.0.1/opam
+index 5246a83..c17a1ba 100644
+--- a/packages/a-1/a-1.0.0.1/opam
++++ b/packages/a-1/a-1.0.0.1/opam
+@@ -1,7 +1,7 @@
+ opam-version: "2.0"
+ synopsis: "Synopsis"
+ description: "Description"
+-maintainer: "Maintainer"
++maintainer: "Another maintainer"
+ author: "Author"
+ license: "Apache-2.0"
+ homepage: "https://github.com/ocurrent/opam-repo-ci"
+diff --git a/packages/a-1/a-1.0.0.2/opam b/packages/a-1/a-1.0.0.2/opam
+index 5246a83..c018682 100644
+--- a/packages/a-1/a-1.0.0.2/opam
++++ b/packages/a-1/a-1.0.0.2/opam
+@@ -1,7 +1,7 @@
+ opam-version: "2.0"
+ synopsis: "Synopsis"
+ description: "Description"
+-maintainer: "Maintainer"
++maintainer: "Someone else"
+ author: "Author"
+ license: "Apache-2.0"
+ homepage: "https://github.com/ocurrent/opam-repo-ci"
diff --git a/test/revdeps-correct.t b/test/revdeps.t
similarity index 93%
rename from test/revdeps-correct.t
rename to test/revdeps.t
index ce18371..4f27d46 100644
--- a/test/revdeps-correct.t
+++ b/test/revdeps.t
@@ -7,4 +7,5 @@
   $ git add .
   $ git commit -qm a-1-update
   $ opam-repo-ci-local --repo="." --branch=new-branch --revdeps-only
-  Ok ()
+  b.0.0.1
+  b.0.0.2