diff --git a/JenkinsfileEval b/JenkinsfileEval
index 36a4ada..dd48281 100644
--- a/JenkinsfileEval
+++ b/JenkinsfileEval
@@ -15,7 +15,7 @@ node {
 
         }
         stage('Clone repo') {
-                    docker.image("karopa/ium:15").inside {
+                    docker.image("karopa/ium:16").inside {
                         stage('Test') {
                             checkout([$class: 'GitSCM', branches: [[name: '*/evaluation']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[url: 'https://git.wmi.amu.edu.pl/s434765/ium_434765']]])
                             copyArtifacts fingerprintArtifacts: true, projectName: 's434765-create-dataset', selector: buildParameter("BUILD_DATASET")
diff --git a/evaluate_network.py b/evaluate_network.py
index 5cddf14..782408a 100644
--- a/evaluate_network.py
+++ b/evaluate_network.py
@@ -37,5 +37,5 @@ for (pred, test) in zip(prediction_denormalized, y_test.values):
 error = mean_squared_error(y_test, prediction_denormalized)
 print(error)
 
-with open("rmse.txt", "w") as file:
+with open("rmse.txt", "a") as file:
     file.write(str(error) + "\n")