diff --git a/.buildlibrary b/.buildlibrary
index b732b8e..05a2736 100644
--- a/.buildlibrary
+++ b/.buildlibrary
@@ -1,4 +1,4 @@
-ValidationKey: '61721060'
+ValidationKey: '61756461'
 AcceptedWarnings:
 - 'Warning: package ''.*'' was built under R version'
 - 'Warning: namespace ''.*'' is not available and has been replaced'
diff --git a/CITATION.cff b/CITATION.cff
index bb1eaa2..172aa90 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,8 +2,8 @@ cff-version: 1.2.0
 message: If you use this software, please cite it using the metadata from this file.
 type: software
 title: 'madrat: May All Data be Reproducible and Transparent (MADRaT) *'
-version: 3.11.0
-date-released: '2024-05-03'
+version: 3.11.1
+date-released: '2024-05-08'
 abstract: Provides a framework which should improve reproducibility and transparency
   in data processing. It provides functionality such as automatic meta data creation
   and management, rudimentary quality management, data caching, work-flow management
diff --git a/DESCRIPTION b/DESCRIPTION
index 6588939..9b688d2 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Type: Package
 Package: madrat
 Title: May All Data be Reproducible and Transparent (MADRaT) *
-Version: 3.11.0
-Date: 2024-05-03
+Version: 3.11.1
+Date: 2024-05-08
 Authors@R: c(
     person("Jan Philipp", "Dietrich", , "dietrich@pik-potsdam.de", role = c("aut", "cre")),
     person("Lavinia", "Baumstark", , "lavinia@pik-potsdam.de", role = "aut"),
diff --git a/R/toolAggregate.R b/R/toolAggregate.R
index 6131ddb..eb915e7 100644
--- a/R/toolAggregate.R
+++ b/R/toolAggregate.R
@@ -252,9 +252,14 @@ toolAggregate <- function(x, rel, weight = NULL, from = NULL, to = NULL, dim = 1
     tmp <- toolAggregate(weight, rel, from = from, to = to, dim = wdim, partrel = partrel, verbosity = 10)
     if (zeroWeight != "allow" && any(tmp == 0, na.rm = TRUE)) {
       if (zeroWeight == "warn") {
-        warning("Weight sum is 0, so cannot normalize and will return 0 for some ",
-                "aggregation targets. This changes the total sum of the magpie object! ",
-                'If this is really intended set zeroWeight = "allow".')
+        msg <- paste0("Weight sum is 0, so cannot normalize and will return 0 for some ",
+                      "aggregation targets. This changes the total sum of the magpie object! ",
+                      'If this is really intended set zeroWeight = "allow".')
+        if (Sys.Date() < "2024-06-01") {
+          message(msg)
+        } else {
+          warning(msg)
+        }
       } else {
         stop("Weight sum is 0, so cannot normalize. This changes the total sum of the magpie object!")
       }
diff --git a/README.md b/README.md
index 0c7d092..c7ad94b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # May All Data be Reproducible and Transparent (MADRaT) *
 
-R package **madrat**, version **3.11.0**
+R package **madrat**, version **3.11.1**
 
 [![CRAN status](https://www.r-pkg.org/badges/version/madrat)](https://cran.r-project.org/package=madrat) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1115490.svg)](https://doi.org/10.5281/zenodo.1115490) [![R build status](https://github.com/pik-piam/madrat/workflows/check/badge.svg)](https://github.com/pik-piam/madrat/actions) [![codecov](https://codecov.io/gh/pik-piam/madrat/branch/master/graph/badge.svg)](https://app.codecov.io/gh/pik-piam/madrat) [![r-universe](https://pik-piam.r-universe.dev/badges/madrat)](https://pik-piam.r-universe.dev/builds)
 
@@ -55,7 +55,7 @@ In case of questions / problems please contact Jan Philipp Dietrich <dietrich@pi
 
 To cite package **madrat** in publications use:
 
-Dietrich J, Baumstark L, Wirth S, Giannousakis A, Rodrigues R, Bodirsky B, Leip D, Kreidenweis U, Klein D, Sauer P (2024). _madrat: May All Data be Reproducible and Transparent (MADRaT)_. doi:10.5281/zenodo.1115490 <https://doi.org/10.5281/zenodo.1115490>, R package version 3.11.0, <https://github.com/pik-piam/madrat>.
+Dietrich J, Baumstark L, Wirth S, Giannousakis A, Rodrigues R, Bodirsky B, Leip D, Kreidenweis U, Klein D, Sauer P (2024). _madrat: May All Data be Reproducible and Transparent (MADRaT)_. doi:10.5281/zenodo.1115490 <https://doi.org/10.5281/zenodo.1115490>, R package version 3.11.1, <https://github.com/pik-piam/madrat>.
 
 A BibTeX entry for LaTeX users is
 
@@ -64,7 +64,7 @@ A BibTeX entry for LaTeX users is
   title = {madrat: May All Data be Reproducible and Transparent (MADRaT)},
   author = {Jan Philipp Dietrich and Lavinia Baumstark and Stephen Wirth and Anastasis Giannousakis and Renato Rodrigues and Benjamin Leon Bodirsky and Debbora Leip and Ulrich Kreidenweis and David Klein and Pascal Sauer},
   year = {2024},
-  note = {R package version 3.11.0},
+  note = {R package version 3.11.1},
   url = {https://github.com/pik-piam/madrat},
   doi = {10.5281/zenodo.1115490},
 }
diff --git a/tests/testthat/test-toolAggregate.R b/tests/testthat/test-toolAggregate.R
index ccf79d4..667c6d8 100644
--- a/tests/testthat/test-toolAggregate.R
+++ b/tests/testthat/test-toolAggregate.R
@@ -222,7 +222,7 @@ test_that("Edge cases work", {
 test_that("columns with only zeros in weight produce a warning", {
   weight <- pm
   weight[, , ] <- 0
-  expect_warning(toolAggregate(pm, rel, weight = weight), "Weight sum is 0")
+  expect_message(toolAggregate(pm, rel, weight = weight), "Weight sum is 0")
   expect_error(toolAggregate(pm, rel, weight = weight, zeroWeight = "stop"), "Weight sum is 0")
   expect_silent(toolAggregate(pm, rel, weight = weight, zeroWeight = "allow"))
 })