diff --git a/flake.lock b/flake.lock
index c200916e..b915924a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -22,11 +22,11 @@
     },
     "emacs-overlay": {
       "locked": {
-        "lastModified": 1624844986,
-        "narHash": "sha256-pJGGyKRLuzChQX4oA5xfyA1QlV7mCWqxu4PmMR6Nk08=",
+        "lastModified": 1624872305,
+        "narHash": "sha256-wc4wPDbcWteZ1jLWWGHydRPLDeWn1Fi4oMJWT4jqvhI=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "b24988a9d1a15c66cf5d7ffec33eb7196f339886",
+        "rev": "6cd4feac20992a8e5ead1fdf16bcdcb59b50f118",
         "type": "github"
       },
       "original": {
@@ -74,11 +74,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1624690077,
-        "narHash": "sha256-46hCcih4CjjX3S3MGbIn0nRE7io1VjXRMQ33Uos1azY=",
+        "lastModified": 1624862928,
+        "narHash": "sha256-fhfEE1RzGGL9cxhJvViU7HMUBLVtSqO1BYyDPuRjUb4=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "2274a926925c288e197d87723705153547727567",
+        "rev": "4f3bc6aa7f333627e86d52dbef6d9686ca296b35",
         "type": "github"
       },
       "original": {
diff --git a/modules/mail-client.nix b/modules/mail-client.nix
index a15a32e4..68127d23 100644
--- a/modules/mail-client.nix
+++ b/modules/mail-client.nix
@@ -82,6 +82,11 @@ in
   };
 
   config = lib.mkIf config.chvp.mail-client.enable {
+    nixpkgs.overlays = [
+      (self: super: {
+        khal = super.khal.overrideAttrs (old: { doInstallCheck = false; });
+      })
+    ];
     chvp.zfs.homeLinks = [
       { path = "mail"; type = "data"; }
       { path = ".cache/mu"; type = "cache"; }