diff --git a/hosts/server10/default.nix b/hosts/server10/default.nix
index 07c98a04..e8d39795 100644
--- a/hosts/server10/default.nix
+++ b/hosts/server10/default.nix
@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 
 {
   imports = [
@@ -67,6 +67,7 @@
     keyfile = config.sops.secrets."ceph/osd.4/keyfile".path;
     deviceClass = "ssd";
   } ];
+  skyflake.storage.ceph.package = pkgs.ceph_17_2;
 
   system.stateVersion = "21.11"; # Did you read the comment?
 }
diff --git a/hosts/server7/default.nix b/hosts/server7/default.nix
index 2f06acf7..ab83eb04 100644
--- a/hosts/server7/default.nix
+++ b/hosts/server7/default.nix
@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 
 {
   imports = [
@@ -57,6 +57,7 @@
     keyfile = config.sops.secrets."ceph/osd.6/keyfile".path;
     deviceClass = "ssd";
   } ];
+  skyflake.storage.ceph.package = pkgs.ceph_16_2;
 
   system.stateVersion = "22.11";
 }
diff --git a/hosts/server8/default.nix b/hosts/server8/default.nix
index c4286be3..1a440d9e 100644
--- a/hosts/server8/default.nix
+++ b/hosts/server8/default.nix
@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 
 {
   imports = [
@@ -89,6 +89,7 @@
     keyfile = config.sops.secrets."ceph/osd.2/keyfile".path;
     deviceClass = "hdd";
   } ];
+  skyflake.storage.ceph.package = pkgs.ceph_17_2;
 
   system.stateVersion = "22.11";
 }
diff --git a/hosts/server9/default.nix b/hosts/server9/default.nix
index c8ba14d7..a522cbdf 100644
--- a/hosts/server9/default.nix
+++ b/hosts/server9/default.nix
@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 
 {
   imports = [
@@ -58,6 +58,7 @@
     keyfile = config.sops.secrets."ceph/osd.3/keyfile".path;
     deviceClass = "hdd";
   } ];
+  skyflake.storage.ceph.package = pkgs.ceph_17_2;
 
   system.stateVersion = "21.11";
 
diff --git a/modules/microvm-host.nix b/modules/microvm-host.nix
index e3a94524..20e8faa3 100644
--- a/modules/microvm-host.nix
+++ b/modules/microvm-host.nix
@@ -8,6 +8,14 @@
   };
 
   config = {
+  # TODO: activate when we fixed the ceph
+  # assertions = [
+  #   {
+  #     assertion = config.skyflake.storage.ceph.package != 17;
+  #     message = "Please pin ceph to major version 17!";
+  #   }
+  # ];
+
     # just all the microvms from this flake that are supposed to run on the server
     microvm.autostart =
       builtins.filter (name:
diff --git a/overlays/default.nix b/overlays/default.nix
index 94c1dc63..d3688063 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -18,6 +18,8 @@ with final; {
     lua = lua5_4;
   }).ceph;
 
+  ceph_17 = assert (lib.versions.majorMinor ceph.version) == "17.2"; prev.ceph;
+
   dex-oidc = prev.dex-oidc.override {
     buildGoModule = let
       ver = lib.versions.majorMinor prev.dex-oidc.version;