diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 0f30ba63..d662c91b 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -30,10 +30,6 @@ jobs:
           - cxx: g++-10
             build_type: Debug
             std: 17
-          - cxx: g++-11
-            build_type: Debug
-            std: 20
-            install: sudo apt install g++-11
           - cxx: clang++-8
             build_type: Debug
             std: 17
diff --git a/test/xchar-test.cc b/test/xchar-test.cc
index cbc961d3..312e632b 100644
--- a/test/xchar-test.cc
+++ b/test/xchar-test.cc
@@ -183,12 +183,6 @@ TEST(xchar_test, format_custom_char) {
 }
 #endif
 
-// Convert a char8_t string to std::string. Otherwise GTest will insist on
-// inserting `char8_t` NTBS into a `char` stream which is disabled by P1423.
-template <typename S> std::string from_u8str(const S& str) {
-  return std::string(str.begin(), str.end());
-}
-
 TEST(xchar_test, format_to) {
   auto buf = std::vector<wchar_t>();
   fmt::format_to(std::back_inserter(buf), L"{}{}", 42, L'\0');