diff --git a/environments/prod/files/publishing-requirements.txt b/environments/prod/files/publishing-requirements.txt
index 8e882477b..c70bb27d4 100644
--- a/environments/prod/files/publishing-requirements.txt
+++ b/environments/prod/files/publishing-requirements.txt
@@ -30,7 +30,7 @@ repoze.lru==0.7
 requests==2.18.4
 rhaptos.cnxmlutils==1.3.0
 sanction==0.4.1
-tinycss2==0.5
+tinycss2==0.6.0
 translationstring==1.3
 tzlocal==1.4
 venusian==1.1.0
diff --git a/environments/staging/files/publishing-requirements.txt b/environments/staging/files/publishing-requirements.txt
index 8e882477b..c70bb27d4 100644
--- a/environments/staging/files/publishing-requirements.txt
+++ b/environments/staging/files/publishing-requirements.txt
@@ -30,7 +30,7 @@ repoze.lru==0.7
 requests==2.18.4
 rhaptos.cnxmlutils==1.3.0
 sanction==0.4.1
-tinycss2==0.5
+tinycss2==0.6.0
 translationstring==1.3
 tzlocal==1.4
 venusian==1.1.0