diff --git a/cmake/Modules/Packages/MDI.cmake b/cmake/Modules/Packages/MDI.cmake
index 70e2ed78c2..0c6bf81ec1 100644
--- a/cmake/Modules/Packages/MDI.cmake
+++ b/cmake/Modules/Packages/MDI.cmake
@@ -11,8 +11,8 @@ option(DOWNLOAD_MDI "Download and compile the MDI library instead of using an al
 
 if(DOWNLOAD_MDI)
   message(STATUS "MDI download requested - we will build our own")
-  set(MDI_URL "https://github.com/MolSSI-MDI/MDI_Library/archive/v1.4.7.tar.gz" CACHE STRING "URL for MDI tarball")
-  set(MDI_MD5 "eaafc1714816e99fabf2d5cf78dfeabf" CACHE STRING "MD5 checksum for MDI tarball")
+  set(MDI_URL "https://github.com/MolSSI-MDI/MDI_Library/archive/v1.4.9.tar.gz" CACHE STRING "URL for MDI tarball")
+  set(MDI_MD5 "705ddb6b0018a542d39f17cc45c67bd9" CACHE STRING "MD5 checksum for MDI tarball")
   mark_as_advanced(MDI_URL)
   mark_as_advanced(MDI_MD5)
   enable_language(C)
diff --git a/lib/mdi/Install.py b/lib/mdi/Install.py
index 902fa261e2..b039599cb5 100644
--- a/lib/mdi/Install.py
+++ b/lib/mdi/Install.py
@@ -32,12 +32,12 @@ make lib-mdi args="-m mpi" # build MDI lib with same settings as in the mpi Make
 
 # settings
 
-version = "1.4.7"
+version = "1.4.9"
 url = "https://github.com/MolSSI-MDI/MDI_Library/archive/v%s.tar.gz" % version
 
 # known checksums for different MDI versions. used to validate the download.
 checksums = { \
-              '1.4.1' : 'f9505fccd4c79301a619f6452dad4ad9', \
+              '1.4.9' : '705ddb6b0018a542d39f17cc45c67bd9', \
               }
 
 # print error message or help