diff --git a/nix/dev-shell.nix b/nix/dev-shell.nix
--- a/nix/dev-shell.nix
+++ b/nix/dev-shell.nix
@@ -75,9 +75,7 @@
     cmake
     cmake-format # linting
     libuv
-    # Localstack is currently broken by partial update
-    # See https://github.com/NixOS/nixpkgs/pull/197572
-    #localstack
+    localstack
     pkg-config
     protobuf_3_15_cmake
     grpc
diff --git a/scripts/source_development_defaults.sh b/scripts/source_development_defaults.sh
--- a/scripts/source_development_defaults.sh
+++ b/scripts/source_development_defaults.sh
@@ -50,3 +50,6 @@
 if [[ ! "$PATH" =~ \.cargo/bin ]]; then
   export PATH="$PATH":${HOME}/.cargo/bin
 fi
+
+# For development and local testing, point to localstack
+export AWS_ENDPOINT=http://localhost:4566