diff --git a/flake.lock b/flake.lock
index f3600e670..53516823c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -17,12 +17,15 @@
       }
     },
     "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
       "locked": {
-        "lastModified": 1678901627,
-        "narHash": "sha256-U02riOqrKKzwjsxc/400XnElV+UtPUQWpANPlyazjH0=",
+        "lastModified": 1681202837,
+        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "93a2b84fc4b70d9e089d029deacc3583435c2ed6",
+        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
         "type": "github"
       },
       "original": {
@@ -49,11 +52,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1679100637,
-        "narHash": "sha256-8QOuwMxharVVzENYFq3geJJDV33w61J1ioCKYTTkN5M=",
+        "lastModified": 1681205926,
+        "narHash": "sha256-fk1THE0Lb3TnY3MtbOaYh+ylSQsD4hKqG7Jpq88/7s4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "615436fd26a5b2b7d436f4f928d4680387fe610a",
+        "rev": "3ca5d676aa7d2d3325f252636549542e21733eb1",
         "type": "github"
       },
       "original": {
@@ -69,6 +72,21 @@
         "nix-bundle-exe": "nix-bundle-exe",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index cdd7b6434..4ac1b6f65 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,16 +38,8 @@
           '';
         };
 
-        hevm = pkgs.haskell.lib.dontCheck (
-          pkgs.haskellPackages.callCabal2nix "hevm" (pkgs.fetchFromGitHub {
-            owner = "ethereum";
-            repo = "hevm";
-            rev = "release/0.50.4";
-            sha256 = "sha256-QuTn9q9iF9K5Cc5DOqhBlV5Wgb1hpxRGZPtEUABAjtw=";
-        }) { secp256k1 = pkgs.secp256k1; });
-
         echidna = with pkgs; lib.pipe
-          (haskellPackages.callCabal2nix "echidna" ./. { inherit hevm; })
+          (haskellPackages.callCabal2nix "echidna" ./. { })
           [
             (haskell.lib.compose.addTestToolDepends [ haskellPackages.hpack slither-analyzer solc ])
             (haskell.lib.compose.disableCabalFlag "static")
diff --git a/stack.yaml b/stack.yaml
index 5ddfa177c..57f48d5dd 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-20.14
+resolver: lts-20.17
 
 packages:
 - '.'