diff --git a/pkgs/data/fonts/rictydiminished-with-firacode/default.nix b/pkgs/data/fonts/rictydiminished-with-firacode/default.nix
index 8b6c3749962a..bf19fb8238ff 100644
--- a/pkgs/data/fonts/rictydiminished-with-firacode/default.nix
+++ b/pkgs/data/fonts/rictydiminished-with-firacode/default.nix
@@ -1,32 +1,40 @@
-{ stdenv, fetchgit, fontforge, python3 }:
+{ stdenv, fetchgit, fontforge, python2, python3 }:
 
 stdenv.mkDerivation rec {
   pname = "rictydiminished-with-firacode";
-  version = "0.0.1";
+  version = "1.2.0";
+
   src = fetchgit {
     url = "https://github.com/hakatashi/RictyDiminished-with-FiraCode.git";
-    rev = "refs/tags/${version}";
-    sha256 = "12lhb0k4d8p4lzw9k6hlsxpfpc15zfshz1h5cbaa88sb8n5jh360";
+    rev = version;
+    sha256 = "1vlzx5dsx6j9d9q84pdnwcxjy7mr1sv8sacx0zgfxhxnj66n1gnn";
     fetchSubmodules = true;
   };
 
-  buildPhase = ''
+  postPatch = ''
+    # Make builds more reproducible
     substituteInPlace apply-feature.py --replace \
       'ricty = ttLib.TTFont(options.in_font)' \
       'ricty = ttLib.TTFont(options.in_font, recalcTimestamp=False)'
     substituteInPlace build-py3.py --replace \
       'datetime.date.today()' \
       'datetime.date.fromtimestamp(float(os.environ["SOURCE_DATE_EPOCH"]))'
-
-    make
   '';
 
   installPhase = ''
+    runHook preInstall
+
     install -m444 -Dt $out/share/fonts/rictydiminished-with-firacode *.ttf
+
+    runHook postInstall
   '';
 
   nativeBuildInputs = [
-    fontforge
+    # Python 3 not supported by parts of the build system
+    # https://github.com/hakatashi/RictyDiminished-with-FiraCode/pull/3
+    (fontforge.override {
+      python = python2;
+    })
     (python3.withPackages (ps: [
       ps.jinja2
       ps.py3to2
@@ -35,7 +43,7 @@ stdenv.mkDerivation rec {
   ];
 
   meta = with stdenv.lib; {
-    homepage = https://github.com/hakatashi/RictyDiminished-with-FiraCode;
+    homepage = "https://github.com/hakatashi/RictyDiminished-with-FiraCode";
     description = "The best Japanese programming font meets the awesone ligatures of Firacode";
     license = licenses.ofl;
     platforms = platforms.all;