diff --git a/mate/Dockerfile b/mate/Dockerfile
index b27c7ef..171f77e 100644
--- a/mate/Dockerfile
+++ b/mate/Dockerfile
@@ -22,6 +22,7 @@ RUN \
     adwaita-icon-theme \
     papirus-icon-theme \
     thunderbird \
+    seamonkey \
     code && \
   echo "**** cleanup ****" && \
   dnf autoremove -y && \
diff --git a/xfce/Dockerfile b/xfce/Dockerfile
index d976311..f5f895e 100644
--- a/xfce/Dockerfile
+++ b/xfce/Dockerfile
@@ -22,6 +22,7 @@ RUN \
     adwaita-icon-theme \
     papirus-icon-theme \
     thunderbird \
+    seamonkey \
     code && \
   echo "**** cleanup ****" && \
   dnf autoremove -y && \