diff --git a/var/spack/repos/builtin/packages/gromacs/package.py b/var/spack/repos/builtin/packages/gromacs/package.py
index 7694aa7f7d..c801dc2b76 100644
--- a/var/spack/repos/builtin/packages/gromacs/package.py
+++ b/var/spack/repos/builtin/packages/gromacs/package.py
@@ -25,6 +25,8 @@ class Gromacs(CMakePackage):
     maintainers = ['junghans', 'marvinbernhardt']
 
     version('master', branch='master')
+    version('2021.5', sha256='eba63fe6106812f72711ef7f76447b12dd1ee6c81b3d8d4d0e3098cd9ea009b6')
+    version('2021.4', sha256='cb708a3e3e83abef5ba475fdb62ef8d42ce8868d68f52dafdb6702dc9742ba1d')
     version('2021.3', sha256='e109856ec444768dfbde41f3059e3123abdb8fe56ca33b1a83f31ed4575a1cc6')
     version('2021.2', sha256='d940d865ea91e78318043e71f229ce80d32b0dc578d64ee5aa2b1a4be801aadb')
     version('2021.1', sha256='bc1d0a75c134e1fb003202262fe10d3d32c59bbb40d714bc3e5015c71effe1e5')