diff --git a/pkgs/development/tools/language-servers/pylyzer/default.nix b/pkgs/development/tools/language-servers/pylyzer/default.nix
index 38a138340fc9..afef2176a669 100644
--- a/pkgs/development/tools/language-servers/pylyzer/default.nix
+++ b/pkgs/development/tools/language-servers/pylyzer/default.nix
@@ -6,20 +6,21 @@
 , python3
 , makeWrapper
 , darwin
+, which
 }:
 
 rustPlatform.buildRustPackage rec {
   pname = "pylyzer";
-  version = "0.0.27";
+  version = "0.0.28";
 
   src = fetchFromGitHub {
     owner = "mtshiba";
     repo = "pylyzer";
     rev = "v${version}";
-    hash = "sha256-RtfRYycHSDaOE71tTtChdMJKyRyTqracHw4p94heFwU=";
+    hash = "sha256-+i35dkYtvGrjN3KWtCfr6W4TkNmV0T8CF+WcaodPbX4=";
   };
 
-  cargoHash = "sha256-Ggvcg96j9LlhDy0BMJzNDXE1Qtf04svt2ezXmkq3aUA=";
+  cargoHash = "sha256-y/CZDh7TURi6VBko+/3U2HQ41asn1IWJF/1WPD0DyT4=";
 
   nativeBuildInputs = [
     git
@@ -42,6 +43,10 @@ rustPlatform.buildRustPackage rec {
     cp -r $HOME/.erg/ $out/lib/erg
   '';
 
+  nativeCheckInputs = [
+    which
+  ];
+
   checkFlags = [
     # this test causes stack overflow
     # > thread 'exec_import' has overflowed its stack