diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 66cff25f..a39cff53 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -27,15 +27,15 @@ jobs:
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        uses: github/codeql-action/init@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
         with:
           languages: ${{ matrix.language }}
           queries: +security-and-quality
 
       - name: Autobuild
-        uses: github/codeql-action/autobuild@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        uses: github/codeql-action/autobuild@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        uses: github/codeql-action/analyze@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
         with:
           category: "/language:${{ matrix.language }}"
diff --git a/driver_test.go b/driver_test.go
index f2aaf35b..761236f5 100644
--- a/driver_test.go
+++ b/driver_test.go
@@ -1947,6 +1947,13 @@ func TestConcurrent(t *testing.T) {
 		// 	t.Skip(`TODO: "fix commands out of sync. Did you run multiple statements at once?" on MariaDB`)
 		// }
 
+		// Release idle connections after this subtest so subsequent subtests can
+		// use the server's full connection budget.  Without this, the default pool
+		// retains a few idle connections that eat into max_connections, causing
+		// Windows to return a TCP timeout instead of MySQL error 1040 when the
+		// next subtest tries to open connections.
+		defer dbt.db.SetMaxIdleConns(0)
+
 		var max int
 		err := dbt.db.QueryRow("SELECT @@max_connections").Scan(&max)
 		if err != nil {