diff --git a/.buildlibrary b/.buildlibrary
index 0224b7b..4d83073 100644
--- a/.buildlibrary
+++ b/.buildlibrary
@@ -1,4 +1,4 @@
-ValidationKey: '627240389'
+ValidationKey: '627605496'
 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 974a2b6..e2520ae 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: 'quitte: Bits and pieces of code to use with quitte-style data frames'
-version: 0.3137.3
-date-released: '2024-09-27'
+version: 0.3137.4
+date-released: '2024-10-08'
 abstract: A collection of functions for easily dealing with quitte-style data frames,
   doing multi-model comparisons and plots.
 authors:
diff --git a/DESCRIPTION b/DESCRIPTION
index a562d17..a16d192 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Type: Package
 Package: quitte
 Title: Bits and pieces of code to use with quitte-style data frames
-Version: 0.3137.3
-Date: 2024-09-27
+Version: 0.3137.4
+Date: 2024-10-08
 Authors@R: c(
     person("Michaja", "Pehl", , "pehl@pik-potsdam.de", role = c("aut", "cre")),
     person("Nico", "Bauer", , "nicolasb@pik-potsdam.de", role = "aut"),
diff --git a/R/read.snapshot.R b/R/read.snapshot.R
index e3597bd..3aa0bf5 100644
--- a/R/read.snapshot.R
+++ b/R/read.snapshot.R
@@ -3,7 +3,7 @@
 #' If head, tail and grep are on your system, a pre-filtering improves performance for csv files.
 #'
 #' @md
-#' @param file Path of single IAMC-style .csv/.mif file
+#' @param file Path of single IAMC-style .csv/.mif/.xlsx/.rds file
 #' @param keep list with quitte columns as names and data points that should be kept.
 #' If head, tail and grep are available and a csv/mif file is read, this list is used to extract the
 #' data before reading it into R. The more you restrict the data here, the faster the data is read.
@@ -81,6 +81,7 @@ read.snapshot <- function(file, keep = list(), filter.function = identity) {
                       na.strings = c("UNDF", "NA", "N/A", "n_a", ""),
                       quote = '"',
                       drop.na = TRUE,
+                      check.duplicates = FALSE,
                       filter.function = joinedfilter)
   unlink(tmpfile)
   return(data)
diff --git a/README.md b/README.md
index 4307713..bf53b86 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Bits and pieces of code to use with quitte-style data frames
 
-R package **quitte**, version **0.3137.3**
+R package **quitte**, version **0.3137.4**
 
 [![CRAN status](https://www.r-pkg.org/badges/version/quitte)](https://cran.r-project.org/package=quitte)  [![R build status](https://github.com/pik-piam/quitte/workflows/check/badge.svg)](https://github.com/pik-piam/quitte/actions) [![codecov](https://codecov.io/gh/pik-piam/quitte/branch/master/graph/badge.svg)](https://app.codecov.io/gh/pik-piam/quitte) [![r-universe](https://pik-piam.r-universe.dev/badges/quitte)](https://pik-piam.r-universe.dev/builds)
 
@@ -47,7 +47,7 @@ In case of questions / problems please contact Michaja Pehl <michaja.pehl@pik-po
 
 To cite package **quitte** in publications use:
 
-Pehl M, Bauer N, Hilaire J, Levesque A, Luderer G, Schultes A, Dietrich J, Richters O (2024). _quitte: Bits and pieces of code to use with quitte-style data frames_. R package version 0.3137.3, <https://github.com/pik-piam/quitte>.
+Pehl M, Bauer N, Hilaire J, Levesque A, Luderer G, Schultes A, Dietrich J, Richters O (2024). _quitte: Bits and pieces of code to use with quitte-style data frames_. R package version 0.3137.4, <https://github.com/pik-piam/quitte>.
 
 A BibTeX entry for LaTeX users is
 
@@ -56,7 +56,7 @@ A BibTeX entry for LaTeX users is
   title = {quitte: Bits and pieces of code to use with quitte-style data frames},
   author = {Michaja Pehl and Nico Bauer and Jérôme Hilaire and Antoine Levesque and Gunnar Luderer and Anselm Schultes and Jan Philipp Dietrich and Oliver Richters},
   year = {2024},
-  note = {R package version 0.3137.3},
+  note = {R package version 0.3137.4},
   url = {https://github.com/pik-piam/quitte},
 }
 ```
diff --git a/man/read.snapshot.Rd b/man/read.snapshot.Rd
index e5b56ca..630d7d4 100644
--- a/man/read.snapshot.Rd
+++ b/man/read.snapshot.Rd
@@ -9,7 +9,7 @@ If head, tail and grep are on your system, a pre-filtering improves performance
 read.snapshot(file, keep = list(), filter.function = identity)
 }
 \arguments{
-\item{file}{Path of single IAMC-style .csv/.mif file}
+\item{file}{Path of single IAMC-style .csv/.mif/.xlsx/.rds file}
 
 \item{keep}{list with quitte columns as names and data points that should be kept.
 If head, tail and grep are available and a csv/mif file is read, this list is used to extract the