diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 693d796..7f4e4b6 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Setup Deno
         uses: denoland/setup-deno@v1
         with:
-          deno-version: 1.x.x
+          deno-version: 1.38.5
 
       - name: Check types
         run: deno check mod.ts
@@ -33,5 +33,8 @@ jobs:
       - name: Test
         run: deno task test
 
+      - name: Ensure output directories exist
+        run: mkdir -p bin/macos bin/macos-arm bin/linux bin/windows
+
       - name: Build
         run: deno task compile
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 62ee1a3..b76425a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -26,7 +26,7 @@ jobs:
       - name: Setup Deno
         uses: denoland/setup-deno@v1
         with:
-          deno-version: 1.x.x
+          deno-version: 1.38.5
 
       - name: Install semantic release
         run: |
diff --git a/commands/machine/schemas.ts b/commands/machine/schemas.ts
index 12ef40c..a498e4a 100644
--- a/commands/machine/schemas.ts
+++ b/commands/machine/schemas.ts
@@ -5,8 +5,10 @@ export const MachineAutoSnapshotFrequencySchema = z.enum([
   "daily",
   "weekly",
   "monthly",
-]);
+]).optional();
 
-export const MachineRestorePointFrequencySchema = z.enum(["shutdown"]);
+export const MachineRestorePointFrequencySchema = z.enum(["shutdown"])
+  .optional();
 
-export const MachinePublicIpTypeSchema = z.enum(["static", "dynamic", "none"]);
+export const MachinePublicIpTypeSchema = z.enum(["static", "dynamic", "none"])
+  .optional();