diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4373a96..6983633 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - Timeout support for 'heroku run' (in case of networking, hanging or "server boot" tests etc), defaults to 60 s, global override `$HATCHET_DEFAULT_RUN_TIMEOUT`, per-test option `:timeout`
 - Delay for empty/timeout retries if run_multi is off, defaults to 1 s, global override `$HATCHET_RUN_RETRY_DELAY`
 - Record and print dyno id ("run.1234") in event of empty output or timeout retry
+- Terminate dyno via API on timeout
 
 ## 7.4.0
 
diff --git a/lib/hatchet/heroku_run.rb b/lib/hatchet/heroku_run.rb
index bc71569..060c160 100644
--- a/lib/hatchet/heroku_run.rb
+++ b/lib/hatchet/heroku_run.rb
@@ -122,7 +122,7 @@ def call
       rescue HerokuRunTimeoutError => e
         if @timeout_fail_count < 3
           @timeout_fail_count += 1
-          message = String.new("Run #{@dyno_id} with command #{@command} timed out after #{@timeout} seconds, retrying...")
+          message = String.new("Run #{@dyno_id} with command #{@command} timed out after #{@timeout} seconds, stopping dyno and retrying...")
           message << "\nstderr until moment of termination was: #{@result.stderr}"
           message << "\nstdout until moment of termination was: #{@result.stdout}"
           message << "\nTo disable pass in `timeout: 0` or set HATCHET_DEFAULT_RUN_TIMEOUT=0 globally"
@@ -130,6 +130,7 @@ def call
           message << "\nreleases: #{@app.releases}"
           message << "\n#{caller.join("\n")}"
           @stderr.puts message
+          @app.platform_api.dyno.stop(@app.name, @dyno_id) if @dyno_id
           sleep(@retry_delay) # without run_multi, this will prevent occasional "can only run one free dyno" errors
           retry
         end