dplyr and lubridate chain crashing r -

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i'm stuck why following code crashing r on machine (both in rstudio , basic r gui) - appreciated!

library(dplyr) library(lubridate)   dates <- data.frame(date = seq(ymd('2015-01-01'),ymd_hms('2019-06-20 23:00:00'),by = "hour"))  # run section few times (simulate many calls in shiny app) for(i in 1:10)   test_df <- dates %>%     mutate(month = month(date),            year = year(date))

my session info:

r version 3.1.3 (2015-03-09) platform: x86_64-w64-mingw32/x64 (64-bit) running under: windows 7 x64 (build 7601) service pack 1  locale: [1] lc_collate=english_united states.1252  lc_ctype=english_united states.1252    lc_monetary=english_united states.1252 [4] lc_numeric=c                           lc_time=english_united states.1252      attached base packages: [1] stats     graphics  grdevices utils     datasets  methods   base       other attached packages: [1] lubridate_1.3.3 dplyr_0.4.2      loaded via namespace (and not attached):  [1] assertthat_0.1 dbi_0.3.1      digest_0.6.8   magrittr_1.5   memoise_0.2.1  parallel_3.1.3 plyr_1.8.3     r6_2.0.1       rcpp_0.11.6    [10] stringi_0.4-1  stringr_1.0.0  tools_3.1.3

update:

i tried re-installing rcpp dplyr, still ran same issue. furthermore, able recreate same issue on mac. ended doing, rolling version of dplyr (0.4.1), restarting, , things working expected. checked rstudio log file after crash , saw this: 

logged from: void {anonymous}::rcleanup(bool) c:\users\administrator\rstudio\src\cpp\session\sessionmain.cpp:2311 18 jun 2015 21:20:22 [rsession-cmohan] error r error 4 (r code execution error) [errormsg=error: cannot allocate vector of size 4.0 gb|||]; occurred at: rstudio::core::error rstudio::r::exec::{anonymous}::evaluateexpressionsunsafe(sexp, sexp, sexprec**, rstudio::r::sexp::protect*) c:\users\administrator\rstudio\src\cpp\r\rexec.cpp:149


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