diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b82b05fe..afb8d1680 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,7 +86,7 @@ include(FetchContent)
 FetchContent_Declare(
         fmt
         GIT_REPOSITORY https://github.com/fmtlib/fmt.git
-        GIT_TAG 10.0.0
+        GIT_TAG 10.1.1
 )
 
 FetchContent_Declare(
diff --git a/core/include/gnuradio-4.0/annotated.hpp b/core/include/gnuradio-4.0/annotated.hpp
index 42f707ea9..773ebab1b 100644
--- a/core/include/gnuradio-4.0/annotated.hpp
+++ b/core/include/gnuradio-4.0/annotated.hpp
@@ -359,13 +359,13 @@ struct fmt::formatter<gr::Annotated<T, description, Arguments...>> {
     fmt::formatter<Type> value_formatter;
 
     template<typename FormatContext>
-    auto
+    constexpr auto
     parse(FormatContext &ctx) {
         return value_formatter.parse(ctx);
     }
 
     template<typename FormatContext>
-    auto
+    constexpr auto
     format(const gr::Annotated<T, description, Arguments...> &annotated, FormatContext &ctx) {
         // TODO: add switch for printing only brief and/or meta-information
         return value_formatter.format(annotated.value, ctx);
diff --git a/core/test/qa_Settings.cpp b/core/test/qa_Settings.cpp
index 65bca8276..f293fcd85 100644
--- a/core/test/qa_Settings.cpp
+++ b/core/test/qa_Settings.cpp
@@ -25,13 +25,13 @@ auto boost::ut::cfg<boost::ut::override> = boost::ut::runner<boost::ut::reporter
 template<typename T>
 struct fmt::formatter<std::complex<T>> {
     template<typename ParseContext>
-    auto
+    constexpr auto
     parse(ParseContext &ctx) {
         return std::begin(ctx);
     }
 
     template<typename FormatContext>
-    auto
+    constexpr auto
     format(const std::complex<T> value, FormatContext &ctx) const {
         return fmt::format_to(ctx.out(), "({}+{}i)", value.real(), value.imag());
     }