diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bf415cb5..9640d766 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,6 +10,7 @@ on:
 
 env:
   UBSAN_OPTIONS: print_stacktrace=1
+  ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
 
 jobs:
   posix:
diff --git a/test/optional_test_constructors.cpp b/test/optional_test_constructors.cpp
index e3483a69..60e6bb15 100644
--- a/test/optional_test_constructors.cpp
+++ b/test/optional_test_constructors.cpp
@@ -27,7 +27,7 @@ struct MyBool
 struct MyExplicitBool
 {
   bool b;
-  MyExplicitBool (bool b) : b(b) {}
+  explicit MyExplicitBool (bool b) : b(b) {}
   operator bool() const { return b; };
 };