diff --git a/.gitignore b/.gitignore
index 7916107af5..ec464113b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,3 +53,6 @@ setup.log
 
 # unit tests
 *.xml
+
+# Backup of opam lock file
+hazel.opam.locked.old
diff --git a/Makefile b/Makefile
index 97966cf4a1..455ff6e441 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ change-deps:
 	dune build hazel.opam
 	opam install ./hazel.opam --deps-only --with-test
 	opam lock .
+	sed -i'.old' '/host-/d' hazel.opam.locked  # remove host- lines which are arch-specific. Not using -i '' because of portability issues https://stackoverflow.com/questions/4247068/sed-command-with-i-option-failing-on-mac-but-works-on-linux
 
 setup-instructor:
 	cp src/haz3lweb/ExerciseSettings_instructor.re src/haz3lweb/ExerciseSettings.re
diff --git a/hazel.opam.locked b/hazel.opam.locked
index 73766a5245..8672b0816a 100644
--- a/hazel.opam.locked
+++ b/hazel.opam.locked
@@ -1,6 +1,10 @@
+
 opam-version: "2.0"
 name: "hazel"
 version: "~dev"
+synopsis: "Hazel, a live functional programming environment with typed holes"
+maintainer: "Hazel Development Team"
+authors: "Hazel Development Team"
 license: "MIT"
 homepage: "https://github.com/hazelgrove/hazel"
 bug-reports: "https://github.com/hazelgrove/hazel/issues"
@@ -51,8 +55,6 @@ depends: [
   "fpath" {= "0.7.3"}
   "gen" {= "1.1"}
   "gen_js_api" {= "1.1.2"}
-  "host-arch-x86_64" {= "1"}
-  "host-system-other" {= "1"}
   "incr_dom" {= "v0.16.0"}
   "incr_map" {= "v0.16.0"}
   "incr_select" {= "v0.16.0"}
@@ -70,6 +72,7 @@ depends: [
   "junit_alcotest" {= "2.0.2" & with-test}
   "lambdasoup" {= "1.0.0"}
   "lsp" {= "1.19.0"}
+  "lwt" {= "5.7.0"}
   "markup" {= "1.0.3"}
   "menhir" {= "20240715"}
   "menhirCST" {= "20240715"}
@@ -94,6 +97,7 @@ depends: [
   "ocamlformat-lib" {= "0.26.2"}
   "ocamlformat-rpc-lib" {= "0.26.2"}
   "ocp-indent" {= "1.8.1"}
+  "ocplib-endian" {= "1.2"}
   "octavius" {= "1.2.2"}
   "ojs" {= "1.1.2"}
   "omd" {= "2.0.0~alpha4"}
@@ -192,7 +196,4 @@ build: [
     "@doc" {with-doc}
   ]
 ]
-dev-repo: "git+https://github.com/hazelgrove/hazel.git"
-synopsis: "Hazel, a live functional programming environment with typed holes"
-maintainer: "Hazel Development Team"
-authors: "Hazel Development Team"
\ No newline at end of file
+dev-repo: "git+https://github.com/hazelgrove/hazel.git"
\ No newline at end of file