diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ccf064..5233cbb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest]
 
     steps:
       - uses: actions/checkout@master
diff --git a/dhall-bash-simple.nix b/dhall-bash-simple.nix
index 99daf71..6e8ca2c 100644
--- a/dhall-bash-simple.nix
+++ b/dhall-bash-simple.nix
@@ -5,12 +5,12 @@ pkgs.stdenv.mkDerivation rec {
 
   src = if pkgs.stdenv.isDarwin
   then pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-bash-1.0.24-x86_64-macos.tar.bz2";
-    sha256 = "0xvdjfi54g70qyqzg10q845qnhwazrx042ixfny4v3zbyfhfdk3q";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-bash-1.0.25-x86_64-macos.tar.bz2";
+    sha256 = "1rvsq6ipy58x99iqs45y8ha751aalvq1g8idvgpq028mv7qq6b3w";
   }
   else pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-bash-1.0.24-x86_64-linux.tar.bz2";
-    sha256 = "10l6wy3mh8m4hkdpwycwzg39hm69vv727jncd7hfb0q308xw0hr4";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-bash-1.0.25-x86_64-linux.tar.bz2";
+    sha256 = "0zl85ydad1cl1lngsg5i8gm7bnp7zs11bggfwlnypfr7kfj1zdyk";
   };
 
   installPhase = ''
diff --git a/dhall-json-simple.nix b/dhall-json-simple.nix
index cdbea02..c53ec41 100644
--- a/dhall-json-simple.nix
+++ b/dhall-json-simple.nix
@@ -5,12 +5,12 @@ pkgs.stdenv.mkDerivation rec {
 
   src = if pkgs.stdenv.isDarwin
   then pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-json-1.5.0-x86_64-macos.tar.bz2";
-    sha256 = "0gxbxnfzhj2q1q64yjiz64vqblka5x52g491dhnsh80g59f9zb6j";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-json-1.6.0-x86_64-macos.tar.bz2";
+    sha256 = "1zj4h1hiq62lvkn8ic5rhzfgiachgq75s74zv94nkfi96xv994ih";
   }
   else pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-json-1.5.0-x86_64-linux.tar.bz2";
-    sha256 = "0anccnsl350w0xw2nacacma0lvnpx9dfwrsc3lxvlcg7v1nf1mpq";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-json-1.6.0-x86_64-linux.tar.bz2";
+    sha256 = "19xxlsn2xbhri6mvznas8hyk90l47w3lqf6y3lhmyaaqz81pd4dr";
   };
 
   installPhase = ''
diff --git a/dhall-nix-simple.nix b/dhall-nix-simple.nix
index 9d373fa..cf6a9d8 100644
--- a/dhall-nix-simple.nix
+++ b/dhall-nix-simple.nix
@@ -5,12 +5,12 @@ pkgs.stdenv.mkDerivation rec {
 
   src = if pkgs.stdenv.isDarwin
   then pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-nix-1.1.9-x86_64-macos.tar.bz2";
-    sha256 = "0mhbcs9wbv1fdgzvqb71d8621kci6yqwhip1hbslhdxnm7z4p8rr";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-nix-1.1.10-x86_64-macos.tar.bz2";
+    sha256 = "0izab5lh70bx0amfz36yqli06qcqw7hi18l4g15cfsqvm7pmqrfb";
   }
   else pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-nix-1.1.9-x86_64-linux.tar.bz2";
-    sha256 = "0n3fh7azr7avr8g73rg7csiacl1qgs9kf7j17q5a9bwwbqqid5k1";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-nix-1.1.10-x86_64-linux.tar.bz2";
+    sha256 = "0k08jngf3sn0mnxcx2wkwg32ilx53zvw0m4608psc187sdslf03i";
   };
 
   installPhase = ''
diff --git a/dhall-simple.nix b/dhall-simple.nix
index 1d3f1e5..12b9045 100644
--- a/dhall-simple.nix
+++ b/dhall-simple.nix
@@ -5,12 +5,12 @@ pkgs.stdenv.mkDerivation rec {
 
   src = if pkgs.stdenv.isDarwin
   then pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-1.27.0-x86_64-macos.tar.bz2";
-    sha256 = "0jwj46d9wnq6jzp9as826y98mc73z8xmq73yznkmlfk8sh26ph01";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-1.28.0-x86_64-macos.tar.bz2";
+    sha256 = "19c6qs01hfcb39bxqwxsagv69bwkp8k6pnvz8gnq197k3yyzw9xm";
   }
   else pkgs.fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.27.0/dhall-1.27.0-x86_64-linux.tar.bz2";
-    sha256 = "1ig6vgdkw631gdwcymfx02pwxql42rldb9w7rbqrqr4b4xww6r3q";
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.28.0/dhall-1.28.0-x86_64-linux.tar.bz2";
+    sha256 = "1s5ln7bpv0186nayw6h2wswc3js3262adrqx7f72k0sa70kjmksq";
   };
 
   installPhase = ''