diff --git a/.github/workflows/flake-health-checks.yml b/.github/workflows/flake-health-checks.yml
index b576e2a..c8a5bd8 100644
--- a/.github/workflows/flake-health-checks.yml
+++ b/.github/workflows/flake-health-checks.yml
@@ -9,10 +9,6 @@ jobs:
     health-check:
         name: "Perform Nix flake checks"
         runs-on: ubuntu-latest
-        container:
-            image: ubuntu:latest
-            volumes:
-                - "/nix:/nix"
         steps:
             - uses: DeterminateSystems/nix-installer-action@main
             - name: Setup Attic cache
@@ -28,10 +24,6 @@ jobs:
     build-checks:
         name: "Build nix outputs"
         runs-on: ubuntu-latest
-        container:
-            image: ubuntu:latest
-            volumes:
-                - "/nix:/nix"
         steps:
             - uses: DeterminateSystems/nix-installer-action@main
             - name: Setup Attic cache
diff --git a/systems/palatine-hill/docker/act-runner.nix b/systems/palatine-hill/docker/act-runner.nix
index 97db4fa..dc7fcfd 100644
--- a/systems/palatine-hill/docker/act-runner.nix
+++ b/systems/palatine-hill/docker/act-runner.nix
@@ -24,7 +24,6 @@ in
         "${act_config_path}:/config.yaml"
         "${act_path}/stable-latest-main/data:/data"
         "/var/run/docker.sock:/var/run/docker.sock"
-        "/nix:/nix"
       ];
       environment = {
         CONFIG_FILE = "/config.yaml";
@@ -47,7 +46,6 @@ in
         "${./act_config.yaml}:/config.yaml"
         "${act_path}/stable-latest-1/data:/data"
         "/var/run/docker.sock:/var/run/docker.sock"
-        "/nix:/nix"
       ];
       environment = {
         CONFIG_FILE = "/config.yaml";
@@ -70,7 +68,6 @@ in
         "${act_config_path}:/config.yaml"
         "${act_path}/stable-latest-2/data:/data"
         "/var/run/docker.sock:/var/run/docker.sock"
-        "/nix:/nix"
       ];
       environment = {
         CONFIG_FILE = "/config.yaml";
diff --git a/systems/palatine-hill/docker/act_config.yaml b/systems/palatine-hill/docker/act_config.yaml
index f66fa4c..bb4f7ec 100644
--- a/systems/palatine-hill/docker/act_config.yaml
+++ b/systems/palatine-hill/docker/act_config.yaml
@@ -79,8 +79,7 @@ container:
     # If you want to allow any volume, please use the following configuration:
     # valid_volumes:
     #   - '**'
-    valid_volumes:
-        - /nix
+    valid_volumes: []
     # overrides the docker client host with the specified one.
     # If it's empty, act_runner will find an available docker host automatically.
     # If it's "-", act_runner will find an available docker host automatically, but the docker host won't be mounted to the job containers and service containers.