diff --git a/README.md b/README.md
index c976890..8907ac4 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ you will need to have installed. If this is not the case, the configuration
 script will warn you. Monicelli is developed with version 6.8, but any
 sufficiently recent release should do just fine.
 
-You will also need to have LLVM development libraries installed, version 3.8.
+You will also need to have LLVM development libraries installed, version 6.0.
 Other versions might or might not work.
 
 Finally, you will need CMake, version 3.0 or higher.
diff --git a/cmake/FindLLVM.cmake b/cmake/FindLLVM.cmake
index 73e497d..118ced0 100644
--- a/cmake/FindLLVM.cmake
+++ b/cmake/FindLLVM.cmake
@@ -15,7 +15,7 @@ execute_process(
   OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
-set(TARGET_LLVM_VERSION "3.8.0")
+set(TARGET_LLVM_VERSION "6.0.0")
 
 if (NOT LLVM_VERSION STREQUAL ${TARGET_LLVM_VERSION})
   message(WARNING "Expected LLVM ${TARGET_LLVM_VERSION}, found ${LLVM_VERSION}, build may fail.")
diff --git a/src/codegen.cpp b/src/codegen.cpp
index 2eba666..9809bea 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -19,6 +19,7 @@
 #include "llvm/IR/Verifier.h"
 #include "llvm/Support/raw_os_ostream.h"
 #include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/Scalar/GVN.h"
 
 #include <vector>
 
@@ -165,7 +166,7 @@ llvm::Value* NestedScopes::lookup(const std::string& name) {
 
 void IRGenerator::declareBuiltins() {
   llvm::FunctionType* printf_type = llvm::TypeBuilder<int(char*, ...), false>::get(context_);
-  auto no_alias = llvm::AttributeSet().addAttribute(context_, 1, llvm::Attribute::NoAlias);
+  auto no_alias = llvm::AttributeList().addAttribute(context_, 1, llvm::Attribute::NoAlias);
 
   module_->getOrInsertFunction("printf", printf_type, no_alias);
   module_->getOrInsertFunction("scanf", printf_type, no_alias);