diff --git a/.github/scripts/apply-pr-quality-ruleset.sh b/.github/scripts/apply-pr-quality-ruleset.sh
new file mode 100755
index 00000000..6d038966
--- /dev/null
+++ b/.github/scripts/apply-pr-quality-ruleset.sh
@@ -0,0 +1,102 @@
+#!/usr/bin/env bash
+# apply-pr-quality-ruleset.sh — Idempotently create/update the pr-quality ruleset
+#
+# This script creates (or updates) the `pr-quality` repository ruleset that
+# enforces pull-request quality gates on the default branch of
+# petry-projects/markets.
+#
+# Pull-request rule parameters configured (codified standard, source of truth:
+# petry-projects/.github/standards/rulesets/pr-quality.json — see #324):
+#   - required_approving_review_count: 1
+#   - require_code_owner_review: true
+#   - required_review_thread_resolution: true
+#   - dismiss_stale_reviews_on_push: true   (the drifted parameter — issue #324)
+#   - require_last_push_approval: true
+#   - allowed_merge_methods: ["squash"]
+#
+# Standard reference:
+#   https://github.com/petry-projects/.github/blob/main/standards/github-settings.md#pr-quality--standard-ruleset-all-repositories
+#
+# Usage:
+#   GH_TOKEN=<admin-token> bash .github/scripts/apply-pr-quality-ruleset.sh
+#
+# The org-level script (petry-projects/.github/scripts/apply-rulesets.sh) is the
+# canonical tool for managing rulesets across all repos. This script exists as a
+# repo-local reference and fallback for the markets repository specifically.
+
+set -euo pipefail
+
+REPO="petry-projects/markets"
+RULESET_NAME="pr-quality"
+
+if [ -z "${GH_TOKEN:-}" ]; then
+  echo "ERROR: GH_TOKEN is required with administration:write scope" >&2
+  exit 1
+fi
+
+export GH_TOKEN
+
+# Fetch existing rulesets
+EXISTING_ID=$(gh api "repos/$REPO/rulesets" \
+  --jq ".[] | select(.name == \"$RULESET_NAME\") | .id")
+
+PAYLOAD=$(jq -n '{
+  name: "pr-quality",
+  target: "branch",
+  enforcement: "active",
+  conditions: {
+    ref_name: {
+      include: ["~DEFAULT_BRANCH"],
+      exclude: []
+    }
+  },
+  rules: [
+    {
+      type: "pull_request",
+      parameters: {
+        required_approving_review_count: 1,
+        require_code_owner_review: true,
+        required_review_thread_resolution: true,
+        dismiss_stale_reviews_on_push: true,
+        require_last_push_approval: true,
+        allowed_merge_methods: ["squash"]
+      }
+    }
+  ],
+  bypass_actors: [
+    {
+      actor_type: "OrganizationAdmin",
+      bypass_mode: "always"
+    },
+    {
+      actor_id: 3167543,
+      actor_type: "Integration",
+      bypass_mode: "always"
+    }
+  ]
+}')
+
+if [ -n "$EXISTING_ID" ]; then
+  echo "Updating existing $RULESET_NAME ruleset (id=$EXISTING_ID) ..."
+  echo "$PAYLOAD" | gh api -X PUT "repos/$REPO/rulesets/$EXISTING_ID" --input - > /dev/null
+  echo "Done — ruleset updated: https://github.com/$REPO/rules/$EXISTING_ID"
+else
+  echo "Creating $RULESET_NAME ruleset ..."
+  # Capture stderr so a 422 conflict from concurrent creation doesn't terminate the script.
+  # On conflict, re-fetch the ID created by the concurrent run and update instead.
+  if RESULT=$(echo "$PAYLOAD" | gh api -X POST "repos/$REPO/rulesets" --input - 2>&1); then
+    NEW_ID=$(echo "$RESULT" | jq -r '.id')
+    echo "Done — ruleset created: https://github.com/$REPO/rules/$NEW_ID"
+  else
+    EXISTING_ID=$(gh api "repos/$REPO/rulesets" \
+      --jq ".[] | select(.name == \"$RULESET_NAME\") | .id")
+    if [ -z "$EXISTING_ID" ]; then
+      echo "ERROR: POST failed and no existing $RULESET_NAME ruleset found" >&2
+      echo "$RESULT" >&2
+      exit 1
+    fi
+    echo "Concurrent creation detected — updating $RULESET_NAME ruleset (id=$EXISTING_ID) ..."
+    echo "$PAYLOAD" | gh api -X PUT "repos/$REPO/rulesets/$EXISTING_ID" --input - > /dev/null
+    echo "Done — ruleset updated: https://github.com/$REPO/rules/$EXISTING_ID"
+  fi
+fi
diff --git a/.github/scripts/apply-repo-settings.sh b/.github/scripts/apply-repo-settings.sh
index c15cfbdf..773bac90 100755
--- a/.github/scripts/apply-repo-settings.sh
+++ b/.github/scripts/apply-repo-settings.sh
@@ -61,4 +61,8 @@ echo "Applying code-quality required-status-checks ruleset ..."
 
 "$SCRIPT_DIR/apply-code-quality-ruleset.sh"
 
+echo "Applying pr-quality required-review ruleset ..."
+
+"$SCRIPT_DIR/apply-pr-quality-ruleset.sh"
+
 echo "Done — repository settings applied: https://github.com/$REPO/settings"
diff --git a/.github/scripts/tests/apply-pr-quality-ruleset.bats b/.github/scripts/tests/apply-pr-quality-ruleset.bats
new file mode 100644
index 00000000..ca67c5fe
--- /dev/null
+++ b/.github/scripts/tests/apply-pr-quality-ruleset.bats
@@ -0,0 +1,49 @@
+#!/usr/bin/env bats
+# Tests for apply-pr-quality-ruleset.sh — static content assertions, no live API calls.
+#
+# The pull_request rule parameters asserted below are the codified standard
+# (petry-projects/.github/standards/rulesets/pr-quality.json), the source of
+# truth referenced by issue #324.
+
+SCRIPT="$(cd "$(dirname "$BATS_TEST_FILENAME")/.." && pwd)/apply-pr-quality-ruleset.sh"
+
+@test "script exists and is executable" {
+  [ -f "$SCRIPT" ]
+  [ -x "$SCRIPT" ]
+}
+
+@test "script uses set -euo pipefail" {
+  grep -q 'set -euo pipefail' "$SCRIPT"
+}
+
+@test "script targets petry-projects/markets repo" {
+  grep -qE '^REPO="petry-projects/markets"$' "$SCRIPT"
+}
+
+@test "script declares the pr-quality ruleset" {
+  grep -qE '^[[:space:]]+name[[:space:]]*:[[:space:]]*"pr-quality"' "$SCRIPT"
+}
+
+@test "script sets dismiss_stale_reviews_on_push to true (issue #324)" {
+  grep -qE '^[[:space:]]+dismiss_stale_reviews_on_push[[:space:]]*:[[:space:]]*true[[:space:]]*,?[[:space:]]*$' "$SCRIPT"
+}
+
+@test "script requires one approving review" {
+  grep -qE '^[[:space:]]+required_approving_review_count[[:space:]]*:[[:space:]]*1[[:space:]]*,?[[:space:]]*$' "$SCRIPT"
+}
+
+@test "script requires code owner review" {
+  grep -qE '^[[:space:]]+require_code_owner_review[[:space:]]*:[[:space:]]*true[[:space:]]*,?[[:space:]]*$' "$SCRIPT"
+}
+
+@test "script requires review thread resolution" {
+  grep -qE '^[[:space:]]+required_review_thread_resolution[[:space:]]*:[[:space:]]*true[[:space:]]*,?[[:space:]]*$' "$SCRIPT"
+}
+
+@test "script requires last push approval" {
+  grep -qE '^[[:space:]]+require_last_push_approval[[:space:]]*:[[:space:]]*true[[:space:]]*,?[[:space:]]*$' "$SCRIPT"
+}
+
+@test "script allows only the squash merge method" {
+  grep -qE '^[[:space:]]+allowed_merge_methods[[:space:]]*:[[:space:]]*\[[[:space:]]*"squash"[[:space:]]*\][[:space:]]*$' "$SCRIPT"
+}
diff --git a/.github/scripts/tests/apply-repo-settings.bats b/.github/scripts/tests/apply-repo-settings.bats
index c9aa4156..6ab7c21c 100755
--- a/.github/scripts/tests/apply-repo-settings.bats
+++ b/.github/scripts/tests/apply-repo-settings.bats
@@ -33,3 +33,7 @@ SCRIPT="$(cd "$(dirname "$BATS_TEST_FILENAME")/.." && pwd)/apply-repo-settings.s
 @test "script wires in code-quality ruleset application (issue #375)" {
   grep -q 'apply-code-quality-ruleset.sh' "$SCRIPT"
 }
+
+@test "script wires in pr-quality ruleset application (issue #324)" {
+  grep -q 'apply-pr-quality-ruleset.sh' "$SCRIPT"
+}
diff --git a/.github/workflows/apply-repo-settings.yml b/.github/workflows/apply-repo-settings.yml
index 51d95e01..3f462fa4 100644
--- a/.github/workflows/apply-repo-settings.yml
+++ b/.github/workflows/apply-repo-settings.yml
@@ -17,6 +17,7 @@ on:
     paths:
       - .github/scripts/apply-repo-settings.sh
       - .github/scripts/apply-code-quality-ruleset.sh
+      - .github/scripts/apply-pr-quality-ruleset.sh
       - .github/workflows/apply-repo-settings.yml
 
 permissions: {}