diff --git a/DESCRIPTION b/DESCRIPTION
index 919d3cc..1d1050f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: spatstat.linnet
-Version: 3.1-4.001
-Date: 2024-02-05
+Version: 3.1-5
+Date: 2024-03-24
 Title: Linear Networks Functionality of the 'spatstat' Family
 Authors@R: c(person("Adrian", "Baddeley", 
                     role = c("aut", "cre", "cph"),
@@ -25,8 +25,8 @@ Authors@R: c(person("Adrian", "Baddeley",
 	     person("Ottmar", "Cronie",
 	            role = "ctb"))
 Maintainer: Adrian Baddeley <Adrian.Baddeley@curtin.edu.au>
-Depends: R (>= 3.5.0), spatstat.data (>= 3.0), spatstat.geom (>= 3.2-7), spatstat.random (>= 3.2-1), spatstat.explore (>= 3.2-5), spatstat.model (>= 3.2-9), stats, graphics, grDevices, methods, utils
-Imports: spatstat.utils (>= 3.0-3), Matrix, spatstat.sparse (>= 3.0)
+Depends: R (>= 3.5.0), spatstat.data (>= 3.0-4), spatstat.geom (>= 3.2-9), spatstat.random (>= 3.2-3), spatstat.explore (>= 3.2-7), spatstat.model (>= 3.2-11), stats, graphics, grDevices, methods, utils
+Imports: spatstat.utils (>= 3.0-4), Matrix, spatstat.sparse (>= 3.0-3)
 Suggests: goftest, locfit, spatstat (>= 3.0)
 Description: Defines types of spatial data on a linear network
 	     and provides functionality for geometrical operations,
diff --git a/NEWS b/NEWS
index 28ed720..52b26ea 100644
--- a/NEWS
+++ b/NEWS
@@ -1,9 +1,11 @@
 
-        CHANGES IN spatstat.linnet VERSION 3.1-4.001
+        CHANGES IN spatstat.linnet VERSION 3.1-5
 
 OVERVIEW
 
-    o Slightly accelerated
+    o Slightly accelerated.
+
+    o Internal stability improvements.
 
 SIGNIFICANT USER-VISIBLE CHANGES
 
diff --git a/R/lpp.R b/R/lpp.R
index 931be7f..4d22791 100644
--- a/R/lpp.R
+++ b/R/lpp.R
@@ -1,7 +1,7 @@
 #
 # lpp.R
 #
-#  $Revision: 1.82 $   $Date: 2022/10/09 11:00:03 $
+#  $Revision: 1.83 $   $Date: 2024/03/24 00:53:42 $
 #
 # Class "lpp" of point patterns on linear networks
 
@@ -21,6 +21,8 @@ lpp <- function(X, L, ...) {
       X <- as.data.frame(X)
       #' validate local coordinates
       if(nrow(X) > 0) {
+        X$seg <- as.integer(X$seg)
+        X$tp  <- as.double(X$tp)
         nedge <- nsegments(L)
         if(with(X, any(seg < 1 | seg > nedge)))
           stop("Segment index coordinate 'seg' exceeds bounds")
@@ -47,7 +49,8 @@ lpp <- function(X, L, ...) {
       #' projected points (spatial coordinates and marks)
       df  <- as.data.frame(pro$Xproj)
       #' local coordinates
-      lo  <- data.frame(seg=pro$mapXY, tp=pro$tp)
+      lo  <- data.frame(seg = as.integer(pro$mapXY),
+                        tp  = as.double(pro$tp))
     }
   }
   # combine spatial, local, marks
diff --git a/inst/doc/packagesizes.txt b/inst/doc/packagesizes.txt
index 8b5dbdc..4ddbbfd 100755
--- a/inst/doc/packagesizes.txt
+++ b/inst/doc/packagesizes.txt
@@ -31,4 +31,5 @@ date version nhelpfiles nobjects ndatasets Rlines srclines
 "2023-10-22" "3.1-2" 148 307 0 12268 3270
 "2023-10-28" "3.1-3" 148 307 0 12268 3270
 "2024-02-04" "3.1-4" 148 312 0 12340 3270
-"2024-02-05" "3.1-4.001" 148 312 0 12340 3270
+"2024-03-24" "3.1-5" 148 312 0 12343 3270
+"2024-03-24" "3.1-5" 148 312 0 12343 3270