diff --git a/cmake/Modules/Packages/KIM.cmake b/cmake/Modules/Packages/KIM.cmake
index 42b7bb884d..91a48eb3a7 100644
--- a/cmake/Modules/Packages/KIM.cmake
+++ b/cmake/Modules/Packages/KIM.cmake
@@ -34,8 +34,8 @@ if(DOWNLOAD_KIM)
   enable_language(C)
   enable_language(Fortran)
   ExternalProject_Add(kim_build
-    URL https://s3.openkim.org/kim-api/kim-api-2.2.0.txz
-    URL_MD5 e7f944e1593cffd7444679a660607f6c
+    URL https://s3.openkim.org/kim-api/kim-api-2.2.1.txz
+    URL_MD5 ae1ddda2ef7017ea07934e519d023dca
     BINARY_DIR build
     CMAKE_ARGS ${CMAKE_REQUEST_PIC}
                -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
diff --git a/lib/kim/Install.py b/lib/kim/Install.py
index 3ebcb8e237..ae4b356ba9 100644
--- a/lib/kim/Install.py
+++ b/lib/kim/Install.py
@@ -18,13 +18,14 @@ parser = ArgumentParser(prog='Install.py',
 # settings
 
 thisdir = fullpath('.')
-version = "2.2.0"
+version = "2.2.1"
 
 # known checksums for different KIM-API versions. used to validate the download.
 checksums = { \
         '2.1.2' : '6ac52e14ef52967fc7858220b208cba5', \
         '2.1.3' : '6ee829a1bbba5f8b9874c88c4c4ebff8', \
         '2.2.0' : 'e7f944e1593cffd7444679a660607f6c', \
+        '2.2.1' : 'ae1ddda2ef7017ea07934e519d023dca', \
         }