diff --git a/.github/workflows/Optional-Nix-dev-env-macOS.yml b/.github/workflows/Optional-Nix-dev-env-macOS.yml
index d98ca63bd..8be422289 100644
--- a/.github/workflows/Optional-Nix-dev-env-macOS.yml
+++ b/.github/workflows/Optional-Nix-dev-env-macOS.yml
@@ -7,7 +7,7 @@ on:
 
 
 env:
-  rev: "272fad732d39b24c4549c475176e0d8cbc8c897a"
+  rev: "8e5e424b1c059e9ccf5db6a652458e30de05fa3a"
   cachixAccount: "hnix"
   CACHIX_SIGNING_KEY: ${{ secrets.CACHIX_SIGNING_KEY }}
   doCheck: "false"
diff --git a/.github/workflows/Optional-Nix-dev-env-main.yml b/.github/workflows/Optional-Nix-dev-env-main.yml
index 4250b1f1f..3431bbcda 100644
--- a/.github/workflows/Optional-Nix-dev-env-main.yml
+++ b/.github/workflows/Optional-Nix-dev-env-main.yml
@@ -22,7 +22,7 @@ env:
   ### and the other part of keys explained in `build.sh`, since those address external procedures aound the builds.
   ### Additional documentation is in Nixpkgs Haskell.lib: https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/lib.nix
   ###
-  rev: "272fad732d39b24c4549c475176e0d8cbc8c897a"
+  rev: "8e5e424b1c059e9ccf5db6a652458e30de05fa3a"
   cachixAccount: "hnix"
   CACHIX_SIGNING_KEY: ${{ secrets.CACHIX_SIGNING_KEY }}
   allowInconsistentDependencies: "false"
diff --git a/default.nix b/default.nix
index 0471bc470..0ac78ff5c 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,7 @@
 {
 # For current default and explicitly supported GHCs https://search.nixos.org/packages?query=ghc&from=0&size=500&channel=unstable, Nixpkgs implicitly supports older minor versions also, until the configuration departs from compatibility with them.
 # Compiler in a form ghc8101 <- GHC 8.10.1, just remove spaces and dots
-  compiler    ? "ghc8107"
+  compiler    ? "ghc947"
 
 # Deafult.nix is a unit package abstraciton that allows to abstract over packages even in monorepos:
 # Example: pass --arg cabalName --arg packageRoot "./subprojectDir", or map default.nix over a list of tiples for subprojects.
@@ -93,7 +93,7 @@
 #   , nixos-20.03  # Last stable release, gets almost no updates to recipes, gets only required backports
 #   ...
 #   }
-, rev ? "ce6aa13369b667ac2542593170993504932eb836"
+, rev ? "8e5e424b1c059e9ccf5db6a652458e30de05fa3a"
 
 , pkgs ?
     if builtins.compareVersions builtins.nixVersion "2.0" > 0
diff --git a/flake.lock b/flake.lock
index eab8dc49f..d8341cce2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -3,30 +3,31 @@
     "nix": {
       "flake": false,
       "locked": {
-        "lastModified": 1570712626,
-        "narHash": "sha256-R3yyxSlyz41cLbB6F54etKNkusPNPGHU0WZkSrfJoKU=",
+        "lastModified": 1654014617,
+        "narHash": "sha256-qNL3lQPBsnStkru3j1ajN/H+knXI+X3dku8/dBfSw3g=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "61e816217bfdfffd39c130c7cd24f07e640098fc",
+        "rev": "624e38aa43f304fbb78b4779172809add042b513",
         "type": "github"
       },
       "original": {
         "id": "nix",
-        "rev": "61e816217bfdfffd39c130c7cd24f07e640098fc",
+        "rev": "624e38aa43f304fbb78b4779172809add042b513",
         "type": "indirect"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1635792138,
-        "narHash": "sha256-D79GqaYrwgyM4wvOPbQeKveAHROnVh97F36iSGZO9uA=",
+        "lastModified": 1700272409,
+        "narHash": "sha256-Mge6iOvomplBsvQ47sIeVAwAUGSVXH4qCW4pLUt/qMI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b165ce0c4efbb74246714b5c66b6bcdce8cde175",
+        "rev": "8e5e424b1c059e9ccf5db6a652458e30de05fa3a",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
+        "rev": "8e5e424b1c059e9ccf5db6a652458e30de05fa3a",
         "type": "indirect"
       }
     },
diff --git a/flake.nix b/flake.nix
index ae60df7cf..939256e78 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "A Haskell re-implementation of the Nix expression language";
 
   inputs = {
-    nixpkgs.url = "nixpkgs/ce6aa13369b667ac2542593170993504932eb836";
+    nixpkgs.url = "nixpkgs/8e5e424b1c059e9ccf5db6a652458e30de05fa3a";
     nix = {
       url = "nix/624e38aa43f304fbb78b4779172809add042b513";
       flake = false;
@@ -27,7 +27,7 @@
       (system: pkgs: import ./default.nix {
         inherit pkgs;
         withHoogle = true;
-        compiler = "ghc8107";
+        compiler = "ghc947";
         packageRoot = pkgs.runCommand "hnix-src" {} ''
           cp -r ${./.} $out
           chmod -R +w $out
diff --git a/shell.nix b/shell.nix
index b1420d8e8..01633b5ef 100644
--- a/shell.nix
+++ b/shell.nix
@@ -3,6 +3,6 @@ let defaultAttrs = {
   # Defaults are put in this form deliberately. Details: #748
   withHoogle = true;
   returnShellEnv = true;
-  compiler = "ghc8107";
+  compiler = "ghc947";
 };
 in (import ./. (defaultAttrs // attrs))