diff --git a/nixos/tests/slipshow.nix b/nixos/tests/slipshow.nix
index 40e0f0be620e..abbbc6361e88 100644
--- a/nixos/tests/slipshow.nix
+++ b/nixos/tests/slipshow.nix
@@ -25,11 +25,9 @@
       start_all()
 
       # it may take around a minute to compile the file and serve it
-      machine.succeed("slipshow serve /etc/slipshow/bbslides.md &>/dev/null &")
+      machine.succeed("slipshow serve -p 6000 /etc/slipshow/bbslides.md &>/dev/null &")
 
-      # slipshow serves defaultly on :8080 and unfortunately cannot
-      # be changed currently
-      machine.wait_for_open_port(8080)
-      machine.succeed("curl -i 0.0.0.0:8080")
+      machine.wait_for_open_port(6000)
+      machine.succeed("curl -i 0.0.0.0:6000")
     '';
 }
diff --git a/pkgs/by-name/sl/slipshow/package.nix b/pkgs/by-name/sl/slipshow/package.nix
index 66d644eb5cb7..7a68b342ad61 100644
--- a/pkgs/by-name/sl/slipshow/package.nix
+++ b/pkgs/by-name/sl/slipshow/package.nix
@@ -9,13 +9,13 @@
 
 ocamlPackages.buildDunePackage rec {
   pname = "slipshow";
-  version = "0.6.0";
+  version = "0.7.0";
 
   src = fetchFromGitHub {
     owner = "panglesd";
     repo = "slipshow";
     tag = "v${version}";
-    hash = "sha256-cmBq9RYjvl355+tV+Nf7XmDzgbOqusCjVrqoC34R5CI=";
+    hash = "sha256-HV4qUp/da0GjZ/KSaE4L/qxdosnOTRcC83zIRigxFSY=";
   };
 
   postPatch = ''
@@ -40,6 +40,7 @@ ocamlPackages.buildDunePackage rec {
     lwt
     magic-mime
     ppx_blob
+    ppx_deriving_yojson
     ppx_sexp_value
     sexplib
   ];