diff --git a/default.nix b/default.nix
index 342ed6d577f..795cc612ecc 100644
--- a/default.nix
+++ b/default.nix
@@ -116,6 +116,12 @@ let
     });
   };
 
+  metricOverlay = self: super: {
+    mkDerivation = args: super.mkDerivation (args // {
+      enablePhaseMetrics = true;
+    });
+  };
+
   cardanoPkgsBase = ((import ./pkgs { inherit pkgs; }).override {
     ghc = overrideDerivation pkgs.haskell.compiler.ghc822 (drv: {
       patches = drv.patches ++ [ ./ghc-8.0.2-darwin-rec-link.patch ];
@@ -123,6 +129,7 @@ let
   });
 
   activeOverlays = [ requiredOverlay ]
+      ++ [ metricOverlay ]
       ++ optional enableBenchmarks benchmarkOverlay
       ++ optional enableDebugging debugOverlay
       ++ optional forceDontCheck dontCheckOverlay;
diff --git a/nixpkgs-src.json b/nixpkgs-src.json
index 7bbdfec7d54..a15c503435c 100644
--- a/nixpkgs-src.json
+++ b/nixpkgs-src.json
@@ -1,5 +1,5 @@
 {
-    "rev":            "118431d4d68c68a6605932d94aae0a75a8309d95",
-    "sha256":         "0w2a1ll8c5bysjqbm1ljzcgrmf0gkwm1c97xpfsb8k3ns56x4h52",
-    "sha256unpacked": "146z9syzfiq1phq3gs2kacq2zcvyzbpzxy52vhjgxhm1ygy449lm"
+    "rev":            "3518baa230549044151557c2c37eb8b06897f86d",
+    "sha256":         "1c71lslxiz570xcl13sgp46h9pzjmb2sq0pyj6z42j6mzdfc9rz3",
+    "sha256unpacked": "1bihcn6mmhr7g2pyms8iircwfg53prx7jphnwdw3ifwk4q5fjxnq"
 }