diff --git a/cmake/CompilerFlags.cmake b/cmake/CompilerFlags.cmake
index 68c824b4b..4642bc9ba 100644
--- a/cmake/CompilerFlags.cmake
+++ b/cmake/CompilerFlags.cmake
@@ -9,6 +9,9 @@ if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     # Except for "/*" within comment errors (present in doxygen blocks)
     add_compile_options(-Wno-error=comment)
 
+    # outcome.hpp
+    add_compile_options(-Wno-parentheses)
+
     # Enable PIC
     set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 
diff --git a/external/outcome b/external/outcome
index 595f5ee4e..862506557 160000
--- a/external/outcome
+++ b/external/outcome
@@ -1 +1 @@
-Subproject commit 595f5ee4e5a99d8246a3e162a3304ad99eaf658b
+Subproject commit 862506557820aacdbee6249bd1904abac3907866
diff --git a/libmbsign/include/mbsign/error.h b/libmbsign/include/mbsign/error.h
index b9b23f94f..5a4b0021a 100644
--- a/libmbsign/include/mbsign/error.h
+++ b/libmbsign/include/mbsign/error.h
@@ -61,7 +61,7 @@ inline const std::error_code & make_error_code(const ErrorInfo &ei)
 }
 
 // https://github.com/ned14/outcome/issues/118
-inline void throw_as_system_error_with_payload(const ErrorInfo &ei)
+inline void outcome_throw_as_system_error_with_payload(const ErrorInfo &ei)
 {
     (void) ei;
     OUTCOME_THROW_EXCEPTION(std::system_error(make_error_code(ei)));
diff --git a/libmbutil/include/mbutil/fstab.h b/libmbutil/include/mbutil/fstab.h
index 5d2cbcf76..10cefd6d8 100644
--- a/libmbutil/include/mbutil/fstab.h
+++ b/libmbutil/include/mbutil/fstab.h
@@ -55,7 +55,7 @@ inline const std::error_code & make_error_code(const FstabErrorInfo &ei)
 }
 
 [[noreturn]]
-inline void throw_as_system_error_with_payload(const FstabErrorInfo &ei)
+inline void outcome_throw_as_system_error_with_payload(const FstabErrorInfo &ei)
 {
     (void) ei;
     OUTCOME_THROW_EXCEPTION(std::system_error(make_error_code(ei)));