diff --git a/ansible/roles/docker/files/daemon.json b/ansible/roles/docker/files/daemon.json
index 39cfead..123edbc 100644
--- a/ansible/roles/docker/files/daemon.json
+++ b/ansible/roles/docker/files/daemon.json
@@ -2,7 +2,5 @@
     "metrics-addr" : "0.0.0.0:9323",
     "experimental" : true,
     "mtu": 1450,
-    "network-control-plane-mtu": 1450,
-    "ipv6": true,
-    "fixed-cidr-v6": "fd00::/80"
+    "network-control-plane-mtu": 1450
 }
diff --git a/stacks/matrix.yml b/stacks/matrix.yml
index 1a1454d..59987b1 100644
--- a/stacks/matrix.yml
+++ b/stacks/matrix.yml
@@ -94,7 +94,7 @@ services:
       - 'signald:/signald'
 
   signald:
-    image: 'signald/signald:latest'
+    image: 'signald/signald:0.16.1'
 
     deploy:
       mode: 'replicated'