diff --git a/misc/plover.nix b/misc/plover.nix
index 298247d..e6920a4 100644
--- a/misc/plover.nix
+++ b/misc/plover.nix
@@ -54,7 +54,12 @@ in rec {
     buildPythonPackage rec {
       inherit (tarballs.plover-yaml-dictionary-src.passthru) pname version;
       src = tarballs.plover-yaml-dictionary-src;
-      propagatedBuildInputs = [plover];
+      propagatedBuildInputs = [plover ruamel-yaml];
+    };
+  ruamel-yaml = with python3Packages;
+    buildPythonPackage rec {
+      inherit (tarballs.ruamel-yaml-src.passthru) pname version;
+      src = tarballs.ruamel-yaml-src;
     };
   regenpfeifer-env = pypy3.withPackages (ps: [ps.marisa-trie]);
   wortformliste = pkgs.stdenvNoCC.mkDerivation {
diff --git a/python/tarballs.nix b/python/tarballs.nix
index d7483c2..2e280c6 100644
--- a/python/tarballs.nix
+++ b/python/tarballs.nix
@@ -52,4 +52,10 @@ in rec {
     passthru.pname = "simplefuzzyset";
     passthru.version = "0.0.12";
   };
+  ruamel-yaml-src = fetchurl {
+    url = "https://files.pythonhosted.org/packages/46/a9/6ed24832095b692a8cecc323230ce2ec3480015fbfa4b79941bd41b23a3c/ruamel.yaml-0.17.21.tar.gz";
+    sha256 = "8b7ce697a2f212752a35c1ac414471dc16c424c9573be4926b56ff3f5d23b7af";
+    passthru.pname = "ruamel.yaml";
+    passthru.version = "0.17.21";
+  };
 }
diff --git a/python/update.sh b/python/update.sh
index 81b1ab3..4e0504a 100755
--- a/python/update.sh
+++ b/python/update.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env nix-shell
 #! nix-shell -i bash -p curl jq 
 set -e
-PACKAGES="plover-plugins-manager plover-stroke rtf-tokenize plover-regenpfeifer plover-emoji plover-tapey-tape plover-yaml-dictionary simplefuzzyset"
+PACKAGES="plover-plugins-manager plover-stroke rtf-tokenize plover-regenpfeifer plover-emoji plover-tapey-tape plover-yaml-dictionary simplefuzzyset ruamel.yaml"
 
 cat > tarballs.nix << EOF
 { inputs, pkgs }: let
@@ -15,8 +15,9 @@ for package in $PACKAGES; do
   VERSION=$(echo -E "$JSON" | jq -r '.info.version')
   URL=$(echo "$FILE_INFO" | jq -r '.url')
   SHA256=$(echo "$FILE_INFO" | jq -r '.digests.sha256')
+  sanitized_package=$(echo $package | sed 's/\./-/g')
   cat >> tarballs.nix << EOF
-  $package-src = fetchurl {
+  $sanitized_package-src = fetchurl {
     url = "$URL";
     sha256 = "$SHA256";
     passthru.pname = "$package";