diff --git a/var/spack/repos/builtin/packages/py-nbconvert/package.py b/var/spack/repos/builtin/packages/py-nbconvert/package.py
index 419deb7b1c..3419f14a17 100644
--- a/var/spack/repos/builtin/packages/py-nbconvert/package.py
+++ b/var/spack/repos/builtin/packages/py-nbconvert/package.py
@@ -14,6 +14,7 @@ class PyNbconvert(PythonPackage):
     url      = "https://github.com/jupyter/nbconvert/archive/4.2.0.tar.gz"
 
     version('5.6.0', sha256='21a69fe5756a3af8e76dcc105217cc3bea4d8f23dbff5727d9fd1e4388b53beb')
+    version('5.5.0', sha256='93721d772361d1cd59502dacfb76c4122359b1c321cea1882451532a2db02d59')
     version('4.2.0', sha256='32394be5a20f39f99fabfb9b2f2625df17f1c2a6699182ca41598e98e7cc9610')
     version('4.1.0', sha256='459f23381411fd1ff9ec5ed71fcd56b8c080d97b3a1e47dae1c5c391f9a47266')
     version('4.0.0', sha256='00e25eeca90523ba6b774b289073631ef5ac65bb2de9774e9b7f29604516265c')