diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4bab5c6c..5109b634 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,6 @@ jobs:
           TEAMWORK_URI: "localhost"
           TEAMWORK_API_TOKEN: "test_api_token"
           AUTOMATIC_TAGGING: true
-          BOARD_COLUMN_OPENED: "PR Open"
-          BOARD_COLUMN_MERGED: "Ready to Test"
-          BOARD_COLUMN_CLOSED: "Rejected"
+          WORKFLOW_STAGE_OPENED: "PR Open"
+          WORKFLOW_STAGE_MERGED: "Ready to Test"
+          WORKFLOW_STAGE_CLOSED: "Rejected"
diff --git a/README.md b/README.md
index 972f4803..5d8344ce 100644
--- a/README.md
+++ b/README.md
@@ -48,9 +48,9 @@ jobs:
           TEAMWORK_URI: ${{ secrets.TEAMWORK_URI }}
           TEAMWORK_API_TOKEN: ${{ secrets.TEAMWORK_API_TOKEN }}
           AUTOMATIC_TAGGING: false
-          BOARD_COLUMN_OPENED: 'PR Open'
-          BOARD_COLUMN_MERGED: 'Ready to Test'
-          BOARD_COLUMN_CLOSED: 'Rejected'
+          WORKFLOW_STAGE_OPENED: 'PR Open'
+          WORKFLOW_STAGE_MERGED: 'Ready to Test'
+          WORKFLOW_STAGE_CLOSED: 'Rejected'
         env:
           IGNORE_PROJECT_IDS: '1 2 3'
 
@@ -71,12 +71,12 @@ Tags are added automatically on the task if you are have the option `AUTOMATIC_T
 - A PR is merged: tags `PR Open` and `PR Approved` removed, tag `PR merged` added
 - A PR is closed: tags `PR Open` and `PR Approved` removed
 
-You may also specify columns you'd like the task to be moved to on every stage of the PR:
-- `BOARD_COLUMN_OPENED`: The case-sensitive column name of the column you'd like the task to be moved to once the PR has been opened
-- `BOARD_COLUMN_MERGED`: The case-sensitive column name of the column you'd like the task to be moved to once the PR has been merged
-- `BOARD_COLUMN_CLOSED`: The case-sensitive column name of the column you'd like the task to be moved to if the PR was closed without being merged
+You may also specify [workflow](https://support.teamwork.com/projects/workflows/workflows-introduction) stages you'd like the task to be moved to on every stage of the PR:
+- `WORKFLOW_STAGE_OPENED`: The case-sensitive name of the workflow stage you'd like the task to be moved to once the PR has been opened
+- `WORKFLOW_STAGE_MERGED`: The case-sensitive name of the workflow stage you'd like the task to be moved to once the PR has been merged
+- `WORKFLOW_STAGE_CLOSED`: The case-sensitive name of the workflow stage you'd like the task to be moved to if the PR was closed without being merged
 
-The column names will be checked against all board columns in the task's project, this will be using a `contains()` method so you may specify part of the name instead of the full name, however this `contains()` check is case-sensitive. The first matching column will be used.
+The stage names will be checked against the stages of every workflow in the task's project, this will be using a `contains()` method so you may specify part of the name instead of the full name, however this `contains()` check is case-sensitive. The first matching stage will be used.
 
 ## Contributing
 * Open a PR: https://github.com/Teamwork/github-sync/pulls
diff --git a/action.yml b/action.yml
index 82cb7eb4..014a25f7 100644
--- a/action.yml
+++ b/action.yml
@@ -16,22 +16,34 @@ inputs:
   AUTOMATIC_TAGGING:
     description: 'Do you want to enable automatic tagging: true/false'
     required: false
-  BOARD_COLUMN_OPENED:
-    description: 'The case-sensitive column name of the column you would like the task to be moved to once the PR has been opened'
+  WORKFLOW_STAGE_OPENED:
+    description: 'The case-sensitive name of the workflow stage you would like the task to be moved to once the PR has been opened'
     required: false
     default: ''
-  BOARD_COLUMN_MERGED:
-    description: 'The case-sensitive column name of the column you would like the task to be moved to once the PR has been merged'
+  WORKFLOW_STAGE_MERGED:
+    description: 'The case-sensitive name of the workflow stage you would like the task to be moved to once the PR has been merged'
     required: false
     default: ''
-  BOARD_COLUMN_CLOSED:
-    description: 'The case-sensitive column name of the column you would like the task to be moved to if the PR was closed without being merged'
+  WORKFLOW_STAGE_CLOSED:
+    description: 'The case-sensitive name of the workflow stage you would like the task to be moved to if the PR was closed without being merged'
     required: false
     default: ''
   LIGHTWEIGHT_COMMENT:
     description: 'Generate tiny comments with minimal information'
     required: false
     default: 'false'
+  BOARD_COLUMN_OPENED:
+    description: 'Deprecated.'
+    required: false
+    default: ''
+  BOARD_COLUMN_MERGED:
+    description: 'Deprecated.'
+    required: false
+    default: ''
+  BOARD_COLUMN_CLOSED:
+    description: 'Deprecated.'
+    required: false
+    default: ''
 runs:
   using: 'docker'
   image: 'Dockerfile'
@@ -40,7 +52,10 @@ runs:
     - ${{ inputs.TEAMWORK_URI }}
     - ${{ inputs.TEAMWORK_API_TOKEN }}
     - ${{ inputs.AUTOMATIC_TAGGING }}
+    - ${{ inputs.WORKFLOW_STAGE_OPENED }}
+    - ${{ inputs.WORKFLOW_STAGE_MERGED }}
+    - ${{ inputs.WORKFLOW_STAGE_CLOSED }}
+    - ${{ inputs.LIGHTWEIGHT_COMMENT }}
     - ${{ inputs.BOARD_COLUMN_OPENED }}
     - ${{ inputs.BOARD_COLUMN_MERGED }}
-    - ${{ inputs.BOARD_COLUMN_CLOSED }}
-    - ${{ inputs.LIGHTWEIGHT_COMMENT }}
\ No newline at end of file
+    - ${{ inputs.BOARD_COLUMN_CLOSED }}
\ No newline at end of file
diff --git a/src/main.sh b/src/main.sh
index 9646920d..62a3b37f 100644
--- a/src/main.sh
+++ b/src/main.sh
@@ -17,10 +17,20 @@ main() {
   export TEAMWORK_URI="$2"
   export TEAMWORK_API_TOKEN="$3"
   export AUTOMATIC_TAGGING="$4"
-  export BOARD_COLUMN_OPENED="$5"
-  export BOARD_COLUMN_MERGED="$6"
-  export BOARD_COLUMN_CLOSED="$7"
+  export WORKFLOW_STAGE_OPENED="$5"
+  export WORKFLOW_STAGE_MERGED="$6"
+  export WORKFLOW_STAGE_CLOSED="$7"
   export LIGHTWEIGHT_COMMENT="$8"
+  # BOARD_COLUMN_* are deprecated aliases kept for backwards compatibility.
+  export BOARD_COLUMN_OPENED="${9:-}"
+  export BOARD_COLUMN_MERGED="${10:-}"
+  export BOARD_COLUMN_CLOSED="${11:-}"
+
+  # Fall back to the deprecated BOARD_COLUMN_* inputs when their WORKFLOW_STAGE_*
+  # replacements are not set.
+  : "${WORKFLOW_STAGE_OPENED:=$BOARD_COLUMN_OPENED}"
+  : "${WORKFLOW_STAGE_MERGED:=$BOARD_COLUMN_MERGED}"
+  : "${WORKFLOW_STAGE_CLOSED:=$BOARD_COLUMN_CLOSED}"
 
   env::set_environment
 
diff --git a/src/teamwork.sh b/src/teamwork.sh
index a80abb0a..c7da9e07 100644
--- a/src/teamwork.sh
+++ b/src/teamwork.sh
@@ -31,54 +31,57 @@ teamwork::get_project_id_from_task() {
   echo "$response"
 }
 
-teamwork::get_matching_board_column_id() {
-  local -r column_name=$1
-
-  if [ -z "$column_name" ]; then
+# Resolves a workflow stage name to its "<workflowId> <stageId>" pair within the
+# task's project. Matching is a case-sensitive substring match against the stage
+# name (mirroring the legacy board-column behaviour), and the first match wins.
+# Echoes nothing when no stage name is provided or no stage matches.
+teamwork::get_workflow_stage() {
+  local -r stage_name=$1
+
+  if [ -z "$stage_name" ]; then
     return
   fi
 
   if [ "$ENV" == "test" ]; then
-    echo "$TEAMWORK_PROJECT_ID"
+    echo "$TEAMWORK_PROJECT_ID $TEAMWORK_PROJECT_ID"
     return
   fi
 
-  response=$(
-    curl "$TEAMWORK_URI/projects/$TEAMWORK_PROJECT_ID/boards/columns.json" -u "$TEAMWORK_API_TOKEN"':' |\
-      jq -r --arg column_name "$column_name" '[.columns[] | select(.name | contains($column_name))] | map(.id)[0]'
-  )
-
-  if [ "$response" = "null" ]; then
-    return
-  fi
-
-  echo "$response"
+  # A single call scoped to the project sideloads every stage across the
+  # project's workflow(s); each stage carries its parent workflow id, which the
+  # move endpoint also needs.
+  curl -s "$TEAMWORK_URI/projects/api/v3/workflows.json?projectIds=$TEAMWORK_PROJECT_ID&include=stages" \
+    -u "$TEAMWORK_API_TOKEN"':' |\
+    jq -r --arg stage_name "$stage_name" \
+      '[.included.stages[]? | select(.name | contains($stage_name)) | "\(.workflow.id) \(.id)"][0] // empty'
 }
 
-teamwork::move_task_to_column() {
-  local -r task_id=$TEAMWORK_TASK_ID
-  local -r column_name=$1
+teamwork::move_task_to_stage() {
+  local -r stage_name=$1
 
-  if [ -z "$column_name" ]; then
-    log::message "No column name provided"
+  if [ -z "$stage_name" ]; then
+    log::message "No workflow stage name provided"
     return
   fi
 
-  local -r column_id=$(teamwork::get_matching_board_column_id "$column_name")
-  if [ -z "$column_id" ]; then
-    log::message "Failed to find a matching board column for '$column_name'"
+  local -r stage=$(teamwork::get_workflow_stage "$stage_name")
+  if [ -z "$stage" ]; then
+    log::message "Failed to find a matching workflow stage for '$stage_name'"
     return
   fi
 
+  local workflow_id stage_id
+  read -r workflow_id stage_id <<< "$stage"
+
   if [ "$ENV" == "test" ]; then
-    log::message "Test - Simulate request. Task ID: $TEAMWORK_TASK_ID - Project ID: $TEAMWORK_PROJECT_ID - Column ID: $column_id"
+    log::message "Test - Simulate request. Task ID: $TEAMWORK_TASK_ID - Project ID: $TEAMWORK_PROJECT_ID - Workflow ID: $workflow_id - Stage ID: $stage_id"
     return
   fi
 
-  response=$(curl -X "PUT" "$TEAMWORK_URI/tasks/$TEAMWORK_TASK_ID.json" \
+  response=$(curl -X "PATCH" "$TEAMWORK_URI/projects/api/v3/tasks/$TEAMWORK_TASK_ID/workflows/$workflow_id.json" \
       -u "$TEAMWORK_API_TOKEN"':' \
       -H 'Content-Type: application/json; charset=utf-8' \
-      -d "{ \"todo-item\": { \"columnId\": $column_id } }" )
+      -d "{ \"stageId\": $stage_id, \"positionAfterTask\": -1 }" )
 
   log::message "$response"
 }
@@ -165,7 +168,7 @@ ${pr_body}
   fi
 
   teamwork::add_tag "PR Open"
-  teamwork::move_task_to_column "$BOARD_COLUMN_OPENED"
+  teamwork::move_task_to_stage "$WORKFLOW_STAGE_OPENED"
 }
 
 teamwork::pull_request_closed() {
@@ -186,7 +189,7 @@ teamwork::pull_request_closed() {
     teamwork::add_tag "PR Merged"
     teamwork::remove_tag "PR Open"
     teamwork::remove_tag "PR Approved"
-    teamwork::move_task_to_column "$BOARD_COLUMN_MERGED"
+    teamwork::move_task_to_stage "$WORKFLOW_STAGE_MERGED"
   else
     if [ "$LIGHTWEIGHT_COMMENT" == "true" ]; then
       teamwork::add_comment "PR [**\"$pr_title\"**]($pr_url) closed without merging by **$user**"
@@ -198,7 +201,7 @@ teamwork::pull_request_closed() {
     fi
     teamwork::remove_tag "PR Open"
     teamwork::remove_tag "PR Approved"
-    teamwork::move_task_to_column "$BOARD_COLUMN_CLOSED"
+    teamwork::move_task_to_stage "$WORKFLOW_STAGE_CLOSED"
   fi
 }