diff --git a/pkgs/development/libraries/c-blosc/2.nix b/pkgs/development/libraries/c-blosc/2.nix
index e295c7ad6708..424f30b6547a 100644
--- a/pkgs/development/libraries/c-blosc/2.nix
+++ b/pkgs/development/libraries/c-blosc/2.nix
@@ -14,13 +14,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "c-blosc2";
-  version = "2.19.1";
+  version = "2.21.1";
 
   src = fetchFromGitHub {
     owner = "Blosc";
     repo = "c-blosc2";
     rev = "v${finalAttrs.version}";
-    sha256 = "sha256-t+zh89VFVnqYzxqZh13hS6iieSqbG+DTPzI4aXwY8os=";
+    sha256 = "sha256-Ra/LhLV78Gr2rXIKZIFx3+oJ+Fk03tfmguoGL4P9J5c=";
   };
 
   # https://github.com/NixOS/nixpkgs/issues/144170
diff --git a/pkgs/development/python-modules/blosc2/default.nix b/pkgs/development/python-modules/blosc2/default.nix
index a1cb18bb5633..d62178ee476b 100644
--- a/pkgs/development/python-modules/blosc2/default.nix
+++ b/pkgs/development/python-modules/blosc2/default.nix
@@ -32,14 +32,14 @@
 
 buildPythonPackage rec {
   pname = "blosc2";
-  version = "3.6.1";
+  version = "3.7.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "Blosc";
     repo = "python-blosc2";
     tag = "v${version}";
-    hash = "sha256-MSGuG9Vqniz6gie0je84XNTHLZaZho9tmqELMKoDh/U=";
+    hash = "sha256-mA7/8i77wtl9b6IT4Wp/uFDYp/IacnPnAsRoXe64+z4=";
   };
 
   nativeBuildInputs = [
@@ -75,6 +75,11 @@ buildPythonPackage rec {
   ]
   ++ lib.optionals runTorchTests [ torch ];
 
+  disabledTests = [
+    # attempts external network requests
+    "test_with_remote"
+  ];
+
   passthru.c-blosc2 = c-blosc2;
 
   meta = with lib; {