diff --git a/crates/repl_wasm/build-www.sh b/crates/repl_wasm/build-www.sh
index bc439e05aa6..623a637f495 100755
--- a/crates/repl_wasm/build-www.sh
+++ b/crates/repl_wasm/build-www.sh
@@ -9,7 +9,7 @@
 # We use this two-step process because Netlify times out if we try to build the Web REPL there.
 
 # https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
-set -euxo pipefail
+set -exo pipefail
 
 if ! which wasm-pack
 then
@@ -23,9 +23,22 @@ cd $SCRIPT_RELATIVE_DIR
 mkdir -p build
 rm -rf build/*
 
-# We want a release build, but with debug info (to get stack traces for Wasm backend panics)
-# This configuration is called `--profiling`
-wasm-pack build --profiling --target web -- --features console_error_panic_hook
+# c++abi is not needed for wasm-pack and causes an error, see #6303 for more info
+REMOVE_STR="-C link-arg=-lc++abi"
+
+( # start subshell to limit scope of export RUSTFLAGS
+    # Check if RUSTFLAGS contains the string to be removed
+    if [[ $RUSTFLAGS == *"$REMOVE_STR"* ]]; then
+    # Remove the string
+    RUSTFLAGS=$(echo "$RUSTFLAGS" | sed "s/$REMOVE_STR//g")
+
+    export RUSTFLAGS
+    fi
+
+    # We want a release build, but with debug info (to get stack traces for Wasm backend panics)
+    # This configuration is called `--profiling`
+    wasm-pack build --profiling --target web -- --features console_error_panic_hook
+)
 cp -v pkg/roc_repl_wasm.js build
 
 # To disable optimizations while debugging, do `export REPL_DEBUG=1` before running the script
diff --git a/flake.lock b/flake.lock
index e0c185ee013..d39bc639e0d 100644
--- a/flake.lock
+++ b/flake.lock
@@ -59,17 +59,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1693140250,
-        "narHash": "sha256-URyIDETtu1bbxcSl83xp7irEV04dPEgj7O3LjHcD1Sk=",
+        "lastModified": 1702900294,
+        "narHash": "sha256-pt7sSoJYNw3n8YtXw0Z/Nnr6/PfY2YrjDvqboErXnRM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "676fe5e01b9a41fa14aaa48d87685677664104b1",
+        "rev": "886c9aee6ca9324e127f9c2c4e6f68c2641c8256",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "676fe5e01b9a41fa14aaa48d87685677664104b1",
+        "rev": "886c9aee6ca9324e127f9c2c4e6f68c2641c8256",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index fa6998ae5e9..501b00eeea8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Roc flake";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?rev=676fe5e01b9a41fa14aaa48d87685677664104b1";
+    nixpkgs.url = "github:nixos/nixpkgs?rev=886c9aee6ca9324e127f9c2c4e6f68c2641c8256";
 
     # rust from nixpkgs has some libc problems, this is patched in the rust-overlay
     rust-overlay = {
@@ -134,7 +134,9 @@
           shellHook = ''
             export LLVM_SYS_${llvmMajorMinorStr}_PREFIX="${llvmPkgs.llvm.dev}"
             ${aliases}
-          '';
+          '' + pkgs.lib.optionalString (system == "aarch64-darwin") ''
+            export RUSTFLAGS="-C link-arg=-lc++abi"
+          ''; # lc++abi as workaround for github.com/NixOS/nixpkgs/issues/166205, see also github.com/roc-lang/roc/issues/6303
         };
 
         formatter = pkgs.nixpkgs-fmt;