diff --git a/DESCRIPTION b/DESCRIPTION
index 46cea7d..a7f09ac 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: cytoviewer
-Version: 1.3.2
+Version: 1.3.3
 Title: An interactive multi-channel image viewer for R
 Description: 
     This R package supports interactive visualization of multi-channel images 
diff --git a/NEWS b/NEWS
index 0f53b0e..bf96538 100644
--- a/NEWS
+++ b/NEWS
@@ -45,3 +45,6 @@ Changes in version 1.3.1 (2024-01-04):
 
 Changes in version 1.3.2 (2024-01-05): 
 + added pixel resolution option
+
+Changes in version 1.3.3 (2024-01-05): 
++ updated README and added tests
diff --git a/tests/testthat/test_cytoviewer_functions.R b/tests/testthat/test_cytoviewer_functions.R
index 5de1872..355c313 100644
--- a/tests/testthat/test_cytoviewer_functions.R
+++ b/tests/testthat/test_cytoviewer_functions.R
@@ -149,8 +149,11 @@ test_that("cytoviewer: validity check testing works", {
   cur_object_3 <- pancreasSCE
   colData(cur_object_3)[["CellNb"]] <- as.character(colData(cur_object_3)[["CellNb"]])
   
+  cur_object_4 <- pancreasSCE
+  colData(cur_object_4)[["CellNb"]][1] <- 824.1
+  
   expect_error(cytoviewer(mask = pancreasMasks, 
-                          object = cur_object_3, 
+                          object = cur_object_4, 
                           img_id = "ImageNb", 
                           cell_id = "CellNb"), 
                regexp = "Cell ids should only contain numeric integer values.",