diff --git a/haskell-overlays/default.nix b/haskell-overlays/default.nix
index d81ca8767..8ad5c374e 100644
--- a/haskell-overlays/default.nix
+++ b/haskell-overlays/default.nix
@@ -85,7 +85,7 @@ rec {
   ##
 
   reflexPackages = import ./reflex-packages.nix {
-    inherit haskellLib lib nixpkgs fetchFromGitHub hackGet useFastWeak useReflexOptimizer enableTraceReflexEvents;
+    inherit haskellLib lib nixpkgs fetchFromGitHub hackGet useFastWeak useReflexOptimizer enableTraceReflexEvents enableLibraryProfiling;
   };
   disableTemplateHaskell = import ./disable-template-haskell.nix {
     inherit haskellLib fetchFromGitHub;
diff --git a/haskell-overlays/reflex-packages.nix b/haskell-overlays/reflex-packages.nix
index ba5f529c8..7b97889e5 100644
--- a/haskell-overlays/reflex-packages.nix
+++ b/haskell-overlays/reflex-packages.nix
@@ -1,7 +1,7 @@
 { haskellLib
 , lib, nixpkgs
 , fetchFromGitHub, hackGet
-, useFastWeak, useReflexOptimizer, enableTraceReflexEvents
+, useFastWeak, useReflexOptimizer, enableTraceReflexEvents, enableLibraryProfiling
 }:
 
 with haskellLib;
@@ -36,7 +36,9 @@ in
   # : error is: haddock: internal error: internal: extractDecl
   # No idea where it hits?
   reflex-dom = dontHaddock (addReflexOptimizerFlag reflexDom.reflex-dom);
-  reflex-dom-core = dontHaddock (addReflexOptimizerFlag reflexDom.reflex-dom-core);
+  reflex-dom-core = appendConfigureFlags
+    (dontHaddock (addReflexOptimizerFlag reflexDom.reflex-dom-core))
+    (lib.optional enableLibraryProfiling "-fprofile-reflex");
 
   ##
   ## GHCJS and JSaddle
diff --git a/reflex-dom/github.json b/reflex-dom/github.json
index 80878b2a6..d14ba892d 100644
--- a/reflex-dom/github.json
+++ b/reflex-dom/github.json
@@ -1,6 +1,6 @@
 {
   "owner": "reflex-frp",
   "repo": "reflex-dom",
-  "rev": "e28f91b9d9f3ab3c67323d6d20ebdfc21159f552",
-  "sha256": "04hmaxirkn00hiyk61zigzdg0lfgfvhdb6mvaa4l8zmylnq5f9c6"
+  "rev": "105dd76021e8ab9568bbdac78daf1ba642d76e92",
+  "sha256": "10q8cny4xzpy85xf02827jdpwmhawvilc410mq99ijl18982mc2x"
 }
diff --git a/reflex/github.json b/reflex/github.json
index 1a91197b6..56b218e2a 100644
--- a/reflex/github.json
+++ b/reflex/github.json
@@ -1,6 +1,6 @@
 {
   "owner": "reflex-frp",
   "repo": "reflex",
-  "rev": "f4db125ed82bac9cb2c80672a31c0de93801b32e",
-  "sha256": "04qclkgqp89mwhyjgd771sf05lic422sy9xbjfbyszgjvj6n2y9f"
+  "rev": "4a32a8202e180f0919ec36e6770f6af5ce88818e",
+  "sha256": "12mj7mppc1ap2f0d18d1a825y0qdbpzaxkkr0mxi2yd8q3k5ymls"
 }