diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 44a00d0b5..b620d6372 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -33,8 +33,8 @@ jobs:
               with:
                   claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
 
-                  # Optional: Specify model (defaults to Claude Sonnet 4, uncomment for Claude Opus 4)
-                  # model: "claude-opus-4-20250514"
+                  # Pin the model so a retired default cannot break the workflow
+                  claude_args: "--model claude-sonnet-5"
 
                   # Direct prompt for automated review (no @claude mention needed)
                   prompt: |
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index 38466bff5..cba067f8f 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -32,7 +32,7 @@ jobs:
 
             - name: Run Claude Code
               id: claude
-              uses: anthropics/claude-code-action@beta
+              uses: anthropics/claude-code-action@v1
               with:
                   claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
 
@@ -40,8 +40,8 @@ jobs:
                   additional_permissions: |
                       actions: read
 
-                  # Optional: Specify model (defaults to Claude Sonnet 4, uncomment for Claude Opus 4)
-                  # model: "claude-opus-4-20250514"
+                  # Pin the model so a retired default cannot break the workflow
+                  claude_args: "--model claude-sonnet-5"
 
                   # Optional: Customize the trigger phrase (default: @claude)
                   # trigger_phrase: "/claude"