diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a6052d..f1a1336 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@
 - `bin/upgrade` displays any changes to the changelog and prompts for
    confirmation before applying the remote changes to the local branch.
 
+### Misc
+- Fix code linting errors in bin/ scripts
+
 ## 2020-11-19
 ### Added
 - Updated default [`version`](https://github.com/overleaf/toolkit/blob/master/lib/config-seed/version) to 2.5.0
diff --git a/bin/docker-compose b/bin/docker-compose
index 7a613db..e69978b 100755
--- a/bin/docker-compose
+++ b/bin/docker-compose
@@ -18,7 +18,8 @@ fi
 RC_FILE="$TOOLKIT_ROOT/config/overleaf.rc"
 
 function __main__() {
-  local SHARELATEX_IMAGE_VERSION="$(head -n 1 "$TOOLKIT_ROOT/config/version")"
+  local SHARELATEX_IMAGE_VERSION
+  SHARELATEX_IMAGE_VERSION="$(head -n 1 "$TOOLKIT_ROOT/config/version")"
   local MONGO_IMAGE="mongo:4.0"
   local REDIS_IMAGE="redis:5.0"
 
diff --git a/bin/doctor b/bin/doctor
index c2b87a2..53ab1cc 100755
--- a/bin/doctor
+++ b/bin/doctor
@@ -26,7 +26,8 @@ function add_warning() {
 function indent_to_level() {
   local levels="$1"
   local number_of_spaces=$(( levels * SPACES_PER_INDENT ))
-  local spaces="$(printf %${number_of_spaces}s)"
+  local spaces
+  spaces="$(printf %${number_of_spaces}s)"
   echo -n "${spaces}"
 }
 
@@ -85,7 +86,8 @@ function check_dependencies() {
     print_point 1 "$binary_name"
     if [[ -n $(command -v "$binary_name") ]]; then
       print_point 2 "status: present"
-      local version=$(get_version "$binary_name")
+      local version
+      version=$(get_version "$binary_name")
       print_point 2 "version info: $version"
       if [[ "$binary_name" == "realpath" ]] \
           && [[ "$(command -V "$binary_name")" =~ .*function.* ]]; then
diff --git a/bin/upgrade b/bin/upgrade
index 22c39c4..5c626a6 100755
--- a/bin/upgrade
+++ b/bin/upgrade
@@ -28,7 +28,8 @@ function usage() {
 }
 
 function services_up() {
-  local top_output="$("$TOOLKIT_ROOT/bin/docker-compose" top)"
+  local top_output
+  top_output="$("$TOOLKIT_ROOT/bin/docker-compose" top)"
   if [[ -z "$top_output" ]]; then
     return 1
   else
@@ -38,8 +39,10 @@ function services_up() {
 
 function git_pull_available() {
   local branch="$1"
-  local fetch_output="$(git -C "$TOOLKIT_ROOT" fetch --dry-run origin "$branch" 2>&1)"
-  local filtered_fetch_output="$(echo "$fetch_output" | grep '\-> origin/'"$branch")"
+  local fetch_output
+  fetch_output="$(git -C "$TOOLKIT_ROOT" fetch --dry-run origin "$branch" 2>&1)"
+  local filtered_fetch_output
+  filtered_fetch_output="$(echo "$fetch_output" | grep '\-> origin/'"$branch")"
   if [[ -z "$filtered_fetch_output" ]]; then
     return 1
   else
@@ -85,8 +88,10 @@ function show_changes() {
 }
 
 function handle_image_upgrade() {
-  local user_image_version="$(head -n 1 "$TOOLKIT_ROOT/config/version")"
-  local seed_image_version="$(head -n 1 "$TOOLKIT_ROOT/lib/config-seed/version")"
+  local user_image_version
+  user_image_version="$(head -n 1 "$TOOLKIT_ROOT/config/version")"
+  local seed_image_version
+  seed_image_version="$(head -n 1 "$TOOLKIT_ROOT/lib/config-seed/version")"
 
   if [[ ! "$seed_image_version" > "$user_image_version" ]]; then
     echo "No change to docker image version"