diff --git a/ssh/.ssh/config b/ssh/.ssh/config
index 7c870e0..98a3aea 100644
--- a/ssh/.ssh/config
+++ b/ssh/.ssh/config
@@ -3,18 +3,31 @@ AddKeysToAgent yes
 
 Host github.com
     User git
+    IdentitiesOnly yes
+    IdentityFile ~/.ssh/id_ed25519_github
 
-Host *.home.tensixtyone.com
+Host heroku.com
+    User git
+    IdentitiesOnly yes
+    IdentityFile ~/.ssh/id_ed25519_heroku
+
+Host *.doofnet.uk
     ForwardAgent yes
 
 Host *.tensixtyone.com
     ForwardAgent yes
+    IdentitiesOnly yes
+    IdentityFile ~/.ssh/id_ed25519_tensixtyone
 
 Host dimension.sh
     ForwardAgent yes
+    IdentitiesOnly yes
+    IdentityFile ~/.ssh/id_ed25519_dimension
 
 Host *.dimension.sh
     ForwardAgent yes
+    IdentitiesOnly yes
+    IdentityFile ~/.ssh/id_ed25519_dimension
 
 Host *
     ForwardAgent no