Here's a way with base R:
d <- read.table(text="
wun2 308.0 111.0 72.0 64.0
wupA 8177.0 3933.0 2235.0 2057.0
wus 5.0 0.0 9.0 5.0
x16 581.2 154.3 297.15 384.2
xmas-1 26.5 58.0 26.5 31.0
xmas-2 201.5 138.220 136.5 203.0
y 18.0 1.0 13.0 8.0
yar 5.0 0.0 0.0 2.0
yata 1283.0 679.0 735.0 784.0
yellow-b 129.0 82.0 103.0 96.0
yellow-c 817.345 415.0 832.0 788.0
zormin 3447.0 2005.0 1999.0 2300.0
zpg 1.0 0.0 0.0 0.0
zwilch 1.0 0.0 8.0 14.0
zye 83.0 64.0 17.0 30.865")
subbed <- lapply(d[-1],
function(col) ifelse(grepl('\\d+\\.\\d*5$', col), ceiling(col), col))
result <- data.frame(d[1], subbed)
# V1 V2 V3 V4 V5
# 1 wun2 308.0 111.00 72 64.0
# 2 wupA 8177.0 3933.00 2235 2057.0
# 3 wus 5.0 0.00 9 5.0
# 4 x16 581.2 154.30 298 384.2
# 5 xmas-1 27.0 58.00 27 31.0
# 6 xmas-2 202.0 138.22 137 203.0
# 7 y 18.0 1.00 13 8.0
# 8 yar 5.0 0.00 0 2.0
# 9 yata 1283.0 679.00 735 784.0
# 10 yellow-b 129.0 82.00 103 96.0
# 11 yellow-c 818.0 415.00 832 788.0
# 12 zormin 3447.0 2005.00 1999 2300.0
# 13 zpg 1.0 0.00 0 0.0
# 14 zwilch 1.0 0.00 8 14.0
# 15 zye 83.0 64.00 17 31.0