diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 98f12aabb4ddf22f9375c97669e025adaed6b627..29e439b0a97505591a74e2407ba17bcc584f45e4 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -15,7 +15,8 @@ RUN rm -rf .git
 
 COPY .docker/caosdb-client.json /caosdb-client.json
 
-# build and run tests
+# Build and run tests.
+# If no other command is given to the Docker image
 CMD mkdir build && \
     cd build && \
     conan install .. -s "compiler.libcxx=libstdc++11" && \
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8027befbc7deb93168a888f7c3354685eb661f81..93e5484652c11d1694a21f0aee6703e56d9d879f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -78,16 +78,12 @@ build-testenv: &build-testenv
   stage: setup
   timeout: 2h
   needs: []
-  only:
-    - pipelines
-    - schedules
-    - web
   script:
     - *env
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
 
       #build testenv image
-    - docker pull $CPPLIB_REGISTRY_IMAGE || { CPPLIB_REGISTRY_IMAGE="$CI_REGISTRY/caosdb/src/caosdb-cpplib/testenv:dev" ; docker pull $CPPLIB_REGISTRY_IMAGE ; }
+    - docker pull $CPPLIB_REGISTRY_IMAGE || { CPPLIB_REGISTRY_IMAGE="$CI_REGISTRY/caosdb/src/caosdb-cpplib/testenv:dev" ; echo "Using cpplib@dev instead."; docker pull $CPPLIB_REGISTRY_IMAGE ; }
     - docker build
       --build-arg CPPLIB_REGISTRY_IMAGE=$CPPLIB_REGISTRY_IMAGE
       --file .docker/Dockerfile
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 449e4256f907780bfbd0ce3d6a23853f20de0ae6..fcdf01692fe8dbcd0dfa40ae7ae9eb7f596a5cf3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,4 +19,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+* Fixed failing async test.
+
 ### Security
diff --git a/test/test_async.cpp b/test/test_async.cpp
index c8049865abfb74b662c9f2e63619da80fcc7376b..bf437f6065f386ccfd49b01c56bc6b6d31848af0 100644
--- a/test/test_async.cpp
+++ b/test/test_async.cpp
@@ -53,13 +53,19 @@ TEST(test_async, retrieve_non_existing) {
   auto status = transaction->GetStatus();
   EXPECT_EQ(status.GetCode(), StatusCode::EXECUTING);
 
-  // wait some time
-  std::this_thread::sleep_for(1000ms);
+  // 1000ms are not always sufficient, when there is very high pipeline load.
+  auto count = 1000;
+  auto code = transaction->GetStatus().GetCode();
+  do {
+    // wait some time
+    std::this_thread::sleep_for(10ms);
 
-  // DONT call WaitForIt -> the transaction finishes in the back-ground
-  status = transaction->GetStatus();
-  EXPECT_EQ(status.GetCode(), TransactionStatus::TRANSACTION_ERROR().GetCode());
-  ASSERT_EQ(status.GetCode(), StatusCode::GENERIC_TRANSACTION_ERROR);
+    // DONT call WaitForIt -> the transaction finishes in the background
+    code = transaction->GetStatus().GetCode();
+  } while (--count > 0 && code == StatusCode::EXECUTING);
+  ASSERT_GT(count, 0) << "ERROR: Timeout while waiting for transaction.";
+  EXPECT_EQ(code, TransactionStatus::TRANSACTION_ERROR().GetCode());
+  ASSERT_EQ(code, StatusCode::GENERIC_TRANSACTION_ERROR);
 
   const auto &result_set = transaction->GetResultSet();