diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index d8e391dfd7b7..136003ee912c 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1670,6 +1670,8 @@ self: super: {
         sha256 = "sha256-J8N4+HUQ6vlJBCwCyxv8Fv5HSbtiim64Qh1n9CaRe1o=";
         stripLen = 1;
       })
+      # https://github.com/hercules-ci/hercules-ci-agent/pull/526
+      ./patches/hercules-ci-agent-cachix-1.6.patch
     ])
     (self.generateOptparseApplicativeCompletions [ "hercules-ci-agent" ])
   ];
diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index ef1fa745116f..91c099abc3c3 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -988,29 +988,29 @@ self: super: builtins.intersectAttrs super {
   domaindriven-core = dontCheck super.domaindriven-core;
 
   cachix-api = overrideCabal (drv: {
-    version = "1.5";
+    version = "1.6";
     src = pkgs.fetchFromGitHub {
       owner = "cachix";
       repo = "cachix";
-      rev = "v1.5";
-      sha256 = "sha256-bt8FFtDSJpBckx3dIjW5Xdvj8aVCm78R3VTpjK5F3Ac=";
+      rev = "v1.6";
+      sha256 = "sha256-54ujAZYNigAn1oJAfupUtZHa0WRQbCQGLEfLmkw8iFc=";
     };
     postUnpack = "sourceRoot=$sourceRoot/cachix-api";
     postPatch = ''
-      sed -i 's/1.4.2/1.5/' cachix-api.cabal
+      sed -i 's/1.5/1.6/' cachix-api.cabal
     '';
   }) super.cachix-api;
   cachix = overrideCabal (drv: {
-    version = "1.5";
+    version = "1.6";
     src = pkgs.fetchFromGitHub {
       owner = "cachix";
       repo = "cachix";
-      rev = "v1.5";
-      sha256 = "sha256-bt8FFtDSJpBckx3dIjW5Xdvj8aVCm78R3VTpjK5F3Ac=";
+      rev = "v1.6";
+      sha256 = "sha256-54ujAZYNigAn1oJAfupUtZHa0WRQbCQGLEfLmkw8iFc=";
     };
     postUnpack = "sourceRoot=$sourceRoot/cachix";
     postPatch = ''
-      sed -i 's/1.4.2/1.5/' cachix.cabal
+      sed -i 's/1.5/1.6/' cachix.cabal
     '';
   }) (lib.pipe
         (super.cachix.override {
@@ -1021,8 +1021,7 @@ self: super: builtins.intersectAttrs super {
         [
          (addBuildTool self.hercules-ci-cnix-store.nixPackage)
          (addBuildTool pkgs.pkg-config)
-         (addBuildDepend self.inline-c-cpp)
-         (addBuildDepend self.hercules-ci-cnix-store)
+         (addBuildDepend self.ascii-progress)
         ]
   );
 
diff --git a/pkgs/development/haskell-modules/patches/hercules-ci-agent-cachix-1.6.patch b/pkgs/development/haskell-modules/patches/hercules-ci-agent-cachix-1.6.patch
new file mode 100644
index 000000000000..71145a3a3e4a
--- /dev/null
+++ b/pkgs/development/haskell-modules/patches/hercules-ci-agent-cachix-1.6.patch
@@ -0,0 +1,32 @@
+diff --git a/hercules-ci-agent/hercules-ci-agent/Hercules/Agent/Cachix.hs b/hercules-ci-agent/hercules-ci-agent/Hercules/Agent/Cachix.hs
+index 849d9bc..972bc90 100644
+--- hercules-ci-agent/hercules-ci-agent/Hercules/Agent/Cachix.hs
++++ hercules-ci-agent/hercules-ci-agent/Hercules/Agent/Cachix.hs
+@@ -17,6 +17,7 @@ import Hercules.Agent.Log
+ import Hercules.CNix.Store (StorePath)
+ import Hercules.Error
+ import qualified Hercules.Formats.CachixCache as CachixCache
++import qualified Data.Conduit as Conduit
+ import Protolude
+ 
+ push :: Text -> [StorePath] -> Int -> App ()
+@@ -36,6 +37,9 @@ push cache paths workers = withNamedContext "cache" cache $ do
+         Cachix.Push.PushParams
+           { pushParamsName = Agent.Cachix.pushCacheName pushCache,
+             pushParamsSecret = Agent.Cachix.pushCacheSecret pushCache,
++#if MIN_VERSION_cachix(1,6,0)
++            pushOnClosureAttempt = \_ missing -> return missing,
++#endif
+             pushParamsStore = nixStore,
+             pushParamsClientEnv = clientEnv,
+             pushParamsStrategy = \storePath ->
+@@ -59,6 +63,9 @@ push cache paths workers = withNamedContext "cache" cache $ do
+                       compressionLevel = 2,
+ #else
+                       withXzipCompressor = Cachix.Push.defaultWithXzipCompressor,
++#endif
++#if MIN_VERSION_cachix(1,6,0)
++                      onUncompressedNARStream = \_ _ -> Conduit.awaitForever Conduit.yield,
+ #endif
+                       omitDeriver = False
+                     }