diff --git a/ansible-nix/tasks/setup-postgres.yml b/ansible-nix/tasks/setup-postgres.yml
index 8bc8057fa..785ae9117 100644
--- a/ansible-nix/tasks/setup-postgres.yml
+++ b/ansible-nix/tasks/setup-postgres.yml
@@ -33,7 +33,7 @@
 #     password: ''
 
 - name: create postgres user
-  shell: useradd -m -r -s /bin/bash -d /home/postgres postgres -G postgres,ssl-cert
+  shell: useradd -m -r -s /bin/bash -d /home/postgres postgres -g postgres,ssl-cert
   args:
     executable: /bin/bash
   become: yes
diff --git a/common-nix.vars.pkr.hcl b/common-nix.vars.pkr.hcl
index 843a5be67..ec1eaca00 100644
--- a/common-nix.vars.pkr.hcl
+++ b/common-nix.vars.pkr.hcl
@@ -1 +1 @@
-postgres-version = "15.6.1.36-nix-staged"
+postgres-version = "15.6.1.37-nix-staged"