diff --git a/.github/workflows/copier-update.yaml b/.github/workflows/copier-update.yaml
index 4320a88..9609781 100644
--- a/.github/workflows/copier-update.yaml
+++ b/.github/workflows/copier-update.yaml
@@ -31,7 +31,7 @@ jobs:
       - name: Check for template updates
         id: check
         run: |
-          if ! nix run "$COPIER_FLAKE" -- check-update --quiet .; then
+          if ! nix run --no-write-lock-file "$COPIER_FLAKE" -- check-update --quiet .; then
             echo "update_available=true" >> "$GITHUB_OUTPUT"
           fi
 
@@ -39,7 +39,8 @@ jobs:
         if: steps.check.outputs.update_available == 'true'
         # Intentionally omits --trust so copier skips post-copy tasks (git add, hooks-install, cog commit).
         run: |
-          nix run "$COPIER_FLAKE" -- update --defaults --skip-answered --conflict=inline --context-lines 1 .
+          nix run --no-write-lock-file "$COPIER_FLAKE" -- \
+            update --defaults --skip-answered --conflict=inline --context-lines 1 .
 
       - name: Check for conflict markers
         if: steps.check.outputs.update_available == 'true'
diff --git a/template/{% if hosting_platform == 'github' %}.github{% endif %}/workflows/copier-update.yaml b/template/{% if hosting_platform == 'github' %}.github{% endif %}/workflows/copier-update.yaml
index 4320a88..9609781 100644
--- a/template/{% if hosting_platform == 'github' %}.github{% endif %}/workflows/copier-update.yaml	
+++ b/template/{% if hosting_platform == 'github' %}.github{% endif %}/workflows/copier-update.yaml	
@@ -31,7 +31,7 @@ jobs:
       - name: Check for template updates
         id: check
         run: |
-          if ! nix run "$COPIER_FLAKE" -- check-update --quiet .; then
+          if ! nix run --no-write-lock-file "$COPIER_FLAKE" -- check-update --quiet .; then
             echo "update_available=true" >> "$GITHUB_OUTPUT"
           fi
 
@@ -39,7 +39,8 @@ jobs:
         if: steps.check.outputs.update_available == 'true'
         # Intentionally omits --trust so copier skips post-copy tasks (git add, hooks-install, cog commit).
         run: |
-          nix run "$COPIER_FLAKE" -- update --defaults --skip-answered --conflict=inline --context-lines 1 .
+          nix run --no-write-lock-file "$COPIER_FLAKE" -- \
+            update --defaults --skip-answered --conflict=inline --context-lines 1 .
 
       - name: Check for conflict markers
         if: steps.check.outputs.update_available == 'true'