diff --git a/pkgs/development/compilers/crystal2nix/default.nix b/pkgs/development/compilers/crystal2nix/default.nix
index b1f36b02090..3a53525b477 100644
--- a/pkgs/development/compilers/crystal2nix/default.nix
+++ b/pkgs/development/compilers/crystal2nix/default.nix
@@ -2,13 +2,13 @@
 
 crystal.buildCrystalPackage rec {
   pname = "crystal2nix";
-  version = "0.1.1";
+  version = "0.3.0";
 
   src = fetchFromGitHub {
     owner = "peterhoeg";
     repo = "crystal2nix";
     rev = "v${version}";
-    sha256 = "sha256-LKZychkhWy/rVdrP3Yo6g8CL1pGdiZlBykzFjnWh0fg=";
+    hash = "sha256-gb2vgKWVXwYWfUUcFvOLFF0qB4CTBekEllpyKduU1Mo=";
   };
 
   format = "shards";
@@ -25,8 +25,7 @@ crystal.buildCrystalPackage rec {
   # temporarily off. We need the checks to execute the wrapped binary
   doCheck = false;
 
-  # it requires an internet connection when run
-  doInstallCheck = false;
+  doInstallCheck = true;
 
   meta = with lib; {
     description = "Utility to convert Crystal's shard.lock files to a Nix file";
diff --git a/pkgs/development/compilers/crystal2nix/shards.nix b/pkgs/development/compilers/crystal2nix/shards.nix
index abfc0f93072..728aefb8050 100644
--- a/pkgs/development/compilers/crystal2nix/shards.nix
+++ b/pkgs/development/compilers/crystal2nix/shards.nix
@@ -1,14 +1,12 @@
 {
-  json_mapping = {
-    owner = "crystal-lang";
-    repo = "json_mapping.cr";
-    rev = "v0.1.0";
-    sha256 = "1qq5vs2085x7cwmp96rrjns0yz9kiz1lycxynfbz5psxll6b8p55";
+  spectator = {
+    url = "https://gitlab.com/arctic-fox/spectator.git";
+    rev = "v0.10.5";
+    sha256 = "1fgjz5vg59h4m25v4fjklimcdn62ngqbchm00kw1160ggjpgpzw2";
   };
-  yaml_mapping = {
-    owner = "crystal-lang";
-    repo = "yaml_mapping.cr";
-    rev = "v0.1.0";
-    sha256 = "02spz1521g59ar6rp0znnr01di766kknbjxjnygs39yn0cmpzqc1";
+  version_from_shard = {
+    url = "https://github.com/hugopl/version_from_shard.git";
+    rev = "v1.2.5";
+    sha256 = "0xizj0q4rd541rwjbx04cjifc2gfx4l5v6q2y7gmd0ndjmkgb8ik";
   };
 }