diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
--- a/clang/CMakeLists.txt
+++ b/clang/CMakeLists.txt
@@ -131,7 +131,7 @@
   set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX} )
 
   if(LLVM_INCLUDE_TESTS)
-    find_package(Python3 REQUIRED COMPONENTS Interpreter)
+    find_package(Python3 3.6 REQUIRED COMPONENTS Interpreter)
 
     # Check prebuilt llvm/utils.
     if(EXISTS ${LLVM_TOOLS_BINARY_DIR}/FileCheck${CMAKE_EXECUTABLE_SUFFIX}
diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
--- a/lld/CMakeLists.txt
+++ b/lld/CMakeLists.txt
@@ -57,7 +57,7 @@
   include(CheckAtomic)
 
   if(LLVM_INCLUDE_TESTS)
-    find_package(Python3 REQUIRED COMPONENTS Interpreter)
+    find_package(Python3 3.6 REQUIRED COMPONENTS Interpreter)
 
     # Check prebuilt llvm/utils.
     if(EXISTS ${LLVM_TOOLS_BINARY_DIR}/FileCheck${CMAKE_EXECUTABLE_SUFFIX}
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -697,7 +697,7 @@
 
 include(HandleLLVMOptions)
 
-find_package(Python3 REQUIRED COMPONENTS Interpreter)
+find_package(Python3 3.6 REQUIRED COMPONENTS Interpreter)
 
 ######
 
diff --git a/mlir/CMakeLists.txt b/mlir/CMakeLists.txt
--- a/mlir/CMakeLists.txt
+++ b/mlir/CMakeLists.txt
@@ -79,7 +79,7 @@
 
 if(MLIR_BINDINGS_PYTHON_ENABLED)
   include(MLIRDetectPythonEnv)
-  find_package(Python3 COMPONENTS Interpreter Development NumPy REQUIRED)
+  find_package(Python3 3.6 COMPONENTS Interpreter Development NumPy REQUIRED)
   message(STATUS "Found python include dirs: ${Python3_INCLUDE_DIRS}")
   message(STATUS "Found python libraries: ${Python3_LIBRARIES}")
   message(STATUS "Found numpy v${Python3_NumPy_VERSION}: ${Python3_NumPy_INCLUDE_DIRS}")