diff --git a/var/spack/repos/builtin/packages/cdo/package.py b/var/spack/repos/builtin/packages/cdo/package.py
index 7b1929b7da5..4096176dbb6 100644
--- a/var/spack/repos/builtin/packages/cdo/package.py
+++ b/var/spack/repos/builtin/packages/cdo/package.py
@@ -17,6 +17,7 @@ class Cdo(AutotoolsPackage):
 
     maintainers = ['skosukhin']
 
+    version('1.9.9', sha256='959b5b58f495d521a7fd1daa84644888ec87d6a0df43f22ad950d17aee5ba98d', url='https://code.mpimet.mpg.de/attachments/download/23323/cdo-1.9.9.tar.gz')
     version('1.9.8', sha256='f2660ac6f8bf3fa071cf2a3a196b3ec75ad007deb3a782455e80f28680c5252a', url='https://code.mpimet.mpg.de/attachments/download/20826/cdo-1.9.8.tar.gz')
     version('1.9.7.1', sha256='3771952e065bcf935d43e492707370ed2a0ecb59a06bea24f9ab69d77943962c',
             url='https://code.mpimet.mpg.de/attachments/download/20124/cdo-1.9.7.1.tar.gz')