diff --git a/CHANGELOG.md b/CHANGELOG.md
index c8bbdca42..19a1d9f16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 ### Changed
 
 - Geojson object colors are now related to vehicle partition if defined [#338](https://github.com/Mapotempo/optimizer-api/pull/338)
+- The time horizon has been changed in optimizer-ortools which increases the performances in case of timewindows without end [#341](https://github.com/Mapotempo/optimizer-api/pull/341)
 
 ### Removed
 
diff --git a/README.md b/README.md
index dd833b78f..44b26c406 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ bundle install
 
 This project requires some solver and interface projects in order to be fully functional!
 * [Vroom v1.8.0](https://github.com/VROOM-Project/vroom/releases/tag/v1.8.0)
-* [Optimizer-ortools v1.10.0](https://github.com/Mapotempo/optimizer-ortools) & [OR-Tools v7.8](https://github.com/google/or-tools/releases/tag/v7.8) (use the version corresponding to your system operator, not source code).
+* [Optimizer-ortools v1.11.0](https://github.com/Mapotempo/optimizer-ortools) & [OR-Tools v7.8](https://github.com/google/or-tools/releases/tag/v7.8) (use the version corresponding to your system operator, not source code).
 
 Note : when updating OR-Tools you should to recompile optimizer-ortools.
 
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 55d87bca8..7ebc7d5f9 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -8,7 +8,7 @@ ARG VROOM_VERSION
 FROM vroomvrp/vroom-docker:${VROOM_VERSION:-v1.8.0} as vroom
 
 # Rake
-FROM ${REGISTRY:-registry.mapotempo.com/}mapotempo-${BRANCH:-ce}/optimizer-ortools:${OPTIMIZER_ORTOOLS_VERSION:-v1.10.0}
+FROM ${REGISTRY:-registry.mapotempo.com/}mapotempo-${BRANCH:-ce}/optimizer-ortools:${OPTIMIZER_ORTOOLS_VERSION:-v1.11.0}
 ARG BUNDLE_WITHOUT
 
 ENV LANG C.UTF-8
diff --git a/test/real_cases_test.rb b/test/real_cases_test.rb
index d1314fecd..1ec216684 100644
--- a/test/real_cases_test.rb
+++ b/test/real_cases_test.rb
@@ -290,7 +290,6 @@ def test_ortools_one_route_with_single_mtws
 
     # Haute-Savoie - A single route with a visit with 2 open timewindows (0 ; x] [y ; ∞)
     def test_ortools_open_timewindows
-      # TODO: the timing of this test can be decreased (by 10x) when optimizer-api/-/issues/841 is fixed
       vrp = TestHelper.load_vrp(self)
       check_vrp_services_size = vrp.services.size
       result = OptimizerWrapper.wrapper_vrp('ortools', { services: { vrp: [:ortools] }}, vrp, nil)
@@ -311,7 +310,8 @@ def test_ortools_open_timewindows
       assert result[:routes].sum{ |r| r[:total_travel_time] } <= 13225, "Too long travel time: #{result[:routes].sum{ |r| r[:total_travel_time] }}"
 
       # Check elapsed time
-      assert result[:elapsed] < 15000, "Too long elapsed time: #{result[:elapsed]}"
+      # The rework of time horizon in optimizer-ortools has decreased the computation time drastically
+      assert result[:elapsed] < 1000, "Too long elapsed time: #{result[:elapsed]}"
     end
 
     # Nantes - A single route with an order defining the most part of the route