diff --git a/dhall-bash-simple.nix b/dhall-bash-simple.nix
index 128bf6e..c4e805d 100644
--- a/dhall-bash-simple.nix
+++ b/dhall-bash-simple.nix
@@ -8,11 +8,11 @@ pkgs.stdenv.mkDerivation rec {
   name = "dhall-bash-simple";
 
   src = if pkgs.stdenv.isDarwin
-  then pkgs.fetchurl {
+  then pkgs.fetchzip {
     url = release.dhall-bash-darwin.url;
     sha256 = release.dhall-bash-darwin.hash;
   }
-  else pkgs.fetchurl {
+  else pkgs.fetchzip {
     url = release.dhall-bash-linux.url;
     sha256 = release.dhall-bash-linux.hash;
   };
diff --git a/dhall-json-simple.nix b/dhall-json-simple.nix
index fe473c5..9992f0d 100644
--- a/dhall-json-simple.nix
+++ b/dhall-json-simple.nix
@@ -8,11 +8,11 @@ pkgs.stdenv.mkDerivation rec {
   name = "dhall-json-simple";
 
   src = if pkgs.stdenv.isDarwin
-  then pkgs.fetchurl {
+  then pkgs.fetchzip {
     url = release.dhall-json-darwin.url;
     sha256 = release.dhall-json-darwin.hash;
     }
-  else pkgs.fetchurl {
+  else pkgs.fetchzip {
     url = release.dhall-json-linux.url;
     sha256 = release.dhall-json-linux.hash;
   };
diff --git a/dhall-lsp-simple.nix b/dhall-lsp-simple.nix
index af18b90..18acfaa 100644
--- a/dhall-lsp-simple.nix
+++ b/dhall-lsp-simple.nix
@@ -8,11 +8,11 @@ pkgs.stdenv.mkDerivation rec {
   name = "dhall-lsp-simple";
 
   src = if pkgs.stdenv.isDarwin
-  then pkgs.fetchurl {
+  then pkgs.fetchzip {
     url = release.dhall-lsp-server-darwin.url;
     sha256 = release.dhall-lsp-server-darwin.hash;
   }
-  else pkgs.fetchurl {
+  else pkgs.fetchzip {
     url = release.dhall-lsp-server-linux.url;
     sha256 = release.dhall-lsp-server-linux.hash;
   };
diff --git a/dhall-nix-simple.nix b/dhall-nix-simple.nix
index 55e60e2..b7449aa 100644
--- a/dhall-nix-simple.nix
+++ b/dhall-nix-simple.nix
@@ -8,11 +8,11 @@ pkgs.stdenv.mkDerivation rec {
   name = "dhall-nix-simple";
 
   src = if pkgs.stdenv.isDarwin
-  then pkgs.fetchurl {
+  then pkgs.fetchzip {
     url = release.dhall-nix-darwin.url;
     sha256 = release.dhall-nix-darwin.hash;
   }
-  else pkgs.fetchurl {
+  else pkgs.fetchzip {
     url = release.dhall-nix-linux.url;
     sha256 = release.dhall-nix-linux.hash;
   };
diff --git a/dhall-simple.nix b/dhall-simple.nix
index aff8646..738058b 100644
--- a/dhall-simple.nix
+++ b/dhall-simple.nix
@@ -8,11 +8,11 @@ pkgs.stdenv.mkDerivation rec {
   name = "dhall-simple";
 
   src = if pkgs.stdenv.isDarwin
-  then pkgs.fetchurl {
+  then pkgs.fetchzip {
     url = release.dhall-darwin.url;
     sha256 = release.dhall-darwin.hash;
   }
-  else pkgs.fetchurl {
+  else pkgs.fetchzip {
     url = release.dhall-linux.url;
     sha256 = release.dhall-linux.hash;
   };
diff --git a/dhall-yaml-simple.nix b/dhall-yaml-simple.nix
index 6f10172..279b60f 100644
--- a/dhall-yaml-simple.nix
+++ b/dhall-yaml-simple.nix
@@ -8,11 +8,11 @@ pkgs.stdenv.mkDerivation rec {
   name = "dhall-yaml-simple";
 
   src = if pkgs.stdenv.isDarwin
-  then pkgs.fetchurl {
+  then pkgs.fetchzip {
     url = release.dhall-yaml-darwin.url;
     sha256 = release.dhall-yaml-darwin.hash;
   }
-  else pkgs.fetchurl {
+  else pkgs.fetchzip {
     url = release.dhall-yaml-linux.url;
     sha256 = release.dhall-yaml-linux.hash;
   };
diff --git a/fetch.py b/fetch.py
index 2bea7f4..974aeb0 100755
--- a/fetch.py
+++ b/fetch.py
@@ -17,7 +17,9 @@ def prefetch_binaries(release):
     for a in release['assets']:
         if "linux" in a['name'] or "macos" in a['name']:
             print(a['name'], file=sys.stderr)
-            hash = sub.check_output(["nix-prefetch-url", a['browser_download_url']]).strip().decode()
+            hash = sub.check_output([
+                "nix-prefetch-url", '--unpack', a['browser_download_url']
+            ]).strip().decode()
             res += [{
                 'name': a['name'],
                 'url': a['browser_download_url'],
diff --git a/release.json b/release.json
index 323a97b..cd2e499 100644
--- a/release.json
+++ b/release.json
@@ -2,61 +2,61 @@
   "dhall-linux": {
     "name": "dhall-1.33.1-x86_64-linux.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-1.33.1-x86_64-linux.tar.bz2",
-    "hash": "02gnhkphsjk0qzr8k0lqjxcn7lqkrp27gybi7mkg1s92zgj7643f"
+    "hash": "1790lxfnqh0wisqksvmfxxcm3yfzd04qhdbyvzlcpwwn2mzdn6bp"
   },
   "dhall-darwin": {
     "name": "dhall-1.33.1-x86_64-macos.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-1.33.1-x86_64-macos.tar.bz2",
-    "hash": "07gkfx0fb9975m6x6pvw63llxqpk7nblnvvaph7adyj1vlvmsbza"
+    "hash": "0z3mi9mqnnj4r4rfcqs8r3v9sd3wmk37f23ff6iyznv16303s61g"
   },
   "dhall-bash-linux": {
     "name": "dhall-bash-1.0.31-x86_64-linux.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-bash-1.0.31-x86_64-linux.tar.bz2",
-    "hash": "0hhx7948ljg39qxzrgicx5r6ba20ir22s5gjxdc85irbllrvx2j6"
+    "hash": "1l0ry39vvmn0ync0zfwk951wdinrg82fl7r0c8cyv2c7w1z2skzz"
   },
   "dhall-bash-darwin": {
     "name": "dhall-bash-1.0.31-x86_64-macos.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-bash-1.0.31-x86_64-macos.tar.bz2",
-    "hash": "14nbphx9rw95c8s4b198y8s0fyky27y3rfanyhnsx8rlw9s3fd9n"
+    "hash": "1f8557hl3nadx5wbm07ba7x3a95dfl5py5dipvpm93lp4nxm6icm"
   },
   "dhall-json-linux": {
     "name": "dhall-json-1.7.0-x86_64-linux.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-json-1.7.0-x86_64-linux.tar.bz2",
-    "hash": "1v2ss7fz3prmm4riv9fdcwpphgk56nj8kdc3c6ca6d9d947cg7yc"
+    "hash": "1rahjjkpih3qhhqcwdd632p2vd9h53lihpcw62sy26i71scy8iih"
   },
   "dhall-json-darwin": {
     "name": "dhall-json-1.7.0-x86_64-macos.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-json-1.7.0-x86_64-macos.tar.bz2",
-    "hash": "0z684x9gaz2k5sl87r8xw9l7hm0hif4yn44mca8a6fb28sgf5f48"
+    "hash": "1gd6lpjwk1by25v282gm5x3srvqw2hk6zflfgp4g288chrvnisqv"
   },
   "dhall-lsp-server-linux": {
     "name": "dhall-lsp-server-1.0.8-x86_64-linux.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-lsp-server-1.0.8-x86_64-linux.tar.bz2",
-    "hash": "0pnsf811cpy74s147i0ww7d3b8k03q83ims6q7ii1nam3cigk089"
+    "hash": "04ipl3n7azrz3cngk1hfpkcgrk3djlwyypds7pnld4b4f66kjxbw"
   },
   "dhall-lsp-server-darwin": {
     "name": "dhall-lsp-server-1.0.8-x86_64-macos.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-lsp-server-1.0.8-x86_64-macos.tar.bz2",
-    "hash": "1fnhz2f3r17qf8lahk3isc9g094simjviigwcm1dmkxmb14lk0ac"
+    "hash": "14s6bpfji3bcz1m708zpiscmrlj4zzxmd3h0ighk9q90ka93v2ws"
   },
   "dhall-nix-linux": {
     "name": "dhall-nix-1.1.15-x86_64-linux.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-nix-1.1.15-x86_64-linux.tar.bz2",
-    "hash": "1klfh2hvz62sfdhaxhb5k8qwb6rs64gd3hch2mjz9hjbnza23bk2"
+    "hash": "0r0q30ppgypgzc9a32zr65ql3q0a6i6889h4p2vgm6ra04h78qx1"
   },
   "dhall-nix-darwin": {
     "name": "dhall-nix-1.1.15-x86_64-macos.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-nix-1.1.15-x86_64-macos.tar.bz2",
-    "hash": "0q1lq78cscdwg9in173z7yqkdk1zslhygj02z2yyfqypad59a1rh"
+    "hash": "1hyjcy2p3zwlnb4jdsg6cpp1p5p6510zhpaf87dq6by0s5hs5rbz"
   },
   "dhall-yaml-linux": {
     "name": "dhall-yaml-1.2.0-x86_64-linux.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-yaml-1.2.0-x86_64-linux.tar.bz2",
-    "hash": "0mnqn6by839v1n2ccb33qxdh7jga0x5xq3kkwdsnic6q7fgcsds6"
+    "hash": "0y5qqv6hw9akv0lqyw3cax7jf2mmwkqr1kasxwcnsimqn7a5m5ib"
   },
   "dhall-yaml-darwin": {
     "name": "dhall-yaml-1.2.0-x86_64-macos.tar.bz2",
     "url": "https://github.com/dhall-lang/dhall-haskell/releases/download/1.33.1/dhall-yaml-1.2.0-x86_64-macos.tar.bz2",
-    "hash": "0sv2024rjlycnp2kjfb8y72h6ilfsb475q2pf387aq6y314mlj5w"
+    "hash": "1m2dq17xclr61hl5d0laqwqwjqwcwql9ga6q5xpl9kv2bx5cm8pm"
   }
 }
\ No newline at end of file