diff --git a/lldb/include/lldb/lldb-enumerations.h b/lldb/include/lldb/lldb-enumerations.h
--- a/lldb/include/lldb/lldb-enumerations.h
+++ b/lldb/include/lldb/lldb-enumerations.h
@@ -490,6 +490,7 @@
   eLanguageTypeFortran18 = 0x002d,
   eLanguageTypeAda2005 = 0x002e,
   eLanguageTypeAda2012 = 0x002f,
+  eLanguageTypeMojo = 0x0030,
 
   // Vendor Extensions
   // Note: Language::GetNameForLanguageType
diff --git a/lldb/source/Target/Language.cpp b/lldb/source/Target/Language.cpp
--- a/lldb/source/Target/Language.cpp
+++ b/lldb/source/Target/Language.cpp
@@ -209,6 +209,7 @@
     {"fortran18", eLanguageTypeFortran18},
     {"ada2005", eLanguageTypeAda2005},
     {"ada2012", eLanguageTypeAda2012},
+    {"mojo", eLanguageTypeMojo},
     // Vendor Extensions
     {"assembler", eLanguageTypeMipsAssembler},
     // Now synonyms, in arbitrary order
@@ -463,7 +464,7 @@
   // The base implementation does a simple contains comparision:
   if (path.empty())
     return false;
-  return demangled.GetStringRef().contains(path);                                         
+  return demangled.GetStringRef().contains(path); 
 }
 
 DumpValueObjectOptions::DeclPrintingHelper Language::GetDeclPrintingHelper() {
diff --git a/llvm/include/llvm-c/DebugInfo.h b/llvm/include/llvm-c/DebugInfo.h
--- a/llvm/include/llvm-c/DebugInfo.h
+++ b/llvm/include/llvm-c/DebugInfo.h
@@ -125,6 +125,7 @@
   LLVMDWARFSourceLanguageFortran18,
   LLVMDWARFSourceLanguageAda2005,
   LLVMDWARFSourceLanguageAda2012,
+  LLVMDWARFSourceLanguageMojo,
   // Vendor extensions:
   LLVMDWARFSourceLanguageMips_Assembler,
   LLVMDWARFSourceLanguageGOOGLE_RenderScript,
diff --git a/llvm/include/llvm/BinaryFormat/Dwarf.h b/llvm/include/llvm/BinaryFormat/Dwarf.h
--- a/llvm/include/llvm/BinaryFormat/Dwarf.h
+++ b/llvm/include/llvm/BinaryFormat/Dwarf.h
@@ -263,6 +263,7 @@
   case DW_LANG_Fortran18:
   case DW_LANG_Ada2005:
   case DW_LANG_Ada2012:
+  case DW_LANG_Mojo:
     result = false;
     break;
   }
@@ -329,6 +330,7 @@
   case DW_LANG_C17:
   case DW_LANG_Ada2005:
   case DW_LANG_Ada2012:
+  case DW_LANG_Mojo:
     result = false;
     break;
   }
@@ -393,6 +395,7 @@
   case DW_LANG_Fortran18:
   case DW_LANG_Ada2005:
   case DW_LANG_Ada2012:
+  case DW_LANG_Mojo:
     return false;
   }
   llvm_unreachable("Unknown language kind.");
diff --git a/llvm/include/llvm/BinaryFormat/Dwarf.def b/llvm/include/llvm/BinaryFormat/Dwarf.def
--- a/llvm/include/llvm/BinaryFormat/Dwarf.def
+++ b/llvm/include/llvm/BinaryFormat/Dwarf.def
@@ -925,6 +925,7 @@
 HANDLE_DW_LANG(0x002d, Fortran18, 0, 0, DWARF)
 HANDLE_DW_LANG(0x002e, Ada2005, 0, 0, DWARF)
 HANDLE_DW_LANG(0x002f, Ada2012, 0, 0, DWARF)
+HANDLE_DW_LANG(0x0030, Mojo, 0, 0, DWARF)
 // Vendor extensions:
 HANDLE_DW_LANG(0x8001, Mips_Assembler, std::nullopt, 0, MIPS)
 HANDLE_DW_LANG(0x8e57, GOOGLE_RenderScript, 0, 0, GOOGLE)
diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -150,7 +150,7 @@
     DICompileUnit::DebugNameTableKind NameTableKind, bool RangesBaseAddress,
     StringRef SysRoot, StringRef SDK) {
 
-  assert(((Lang <= dwarf::DW_LANG_Ada2012 && Lang >= dwarf::DW_LANG_C89) ||
+  assert(((Lang <= dwarf::DW_LANG_Mojo && Lang >= dwarf::DW_LANG_C89) ||
           (Lang <= dwarf::DW_LANG_hi_user && Lang >= dwarf::DW_LANG_lo_user)) &&
          "Invalid Language tag");