diff --git a/config/services/murmur.nix b/config/services/murmur.nix
index fc3b72a8..2daff1a6 100644
--- a/config/services/murmur.nix
+++ b/config/services/murmur.nix
@@ -109,9 +109,13 @@ in
 
   # Certs
 
-  network.extraCerts."services_murmur" = "voice.${config.network.dns.domain}";
+  network.extraCerts.services_murmur = "voice.${config.network.dns.domain}";
   users.groups."voice-cert".members = [ "nginx" "murmur" ];
-  security.acme.certs = { "services_murmur" = { group = "voice-cert"; }; };
+  security.acme.certs.services_murmur = {
+    group = "voice-cert";
+    postRun = "systemctl restart murmur";
+    extraDomainNames = [ config.network.dns.domain ];
+  };
 
   # DNS
 
diff --git a/nix/sources.json b/nix/sources.json
index 630e8b50..284ee759 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -89,10 +89,10 @@
         "homepage": null,
         "owner": "kittywitch",
         "repo": "nixexprs",
-        "rev": "2d97bec12deba01402b7189be5116b13b5b5e793",
-        "sha256": "05fngks2g2vgmwlw7amydxmv2zwf2rgzc7xnvf9h1crm99nndzd0",
+        "rev": "0386c0fb902050dbac5de5e7f8a6554d55a46ed5",
+        "sha256": "1fd7ndmwz9wqzvaimrbyzbscfsz8l3j9cqqyyq14xbw78zg4zi8w",
         "type": "tarball",
-        "url": "https://github.com/kittywitch/nixexprs/archive/2d97bec12deba01402b7189be5116b13b5b5e793.tar.gz",
+        "url": "https://github.com/kittywitch/nixexprs/archive/0386c0fb902050dbac5de5e7f8a6554d55a46ed5.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "niv": {
diff --git a/overlays/exprs b/overlays/exprs
index 2d97bec1..0386c0fb 160000
--- a/overlays/exprs
+++ b/overlays/exprs
@@ -1 +1 @@
-Subproject commit 2d97bec12deba01402b7189be5116b13b5b5e793
+Subproject commit 0386c0fb902050dbac5de5e7f8a6554d55a46ed5