diff --git a/NEWS.md b/NEWS.md
index 7cf02dd..3e1494f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -16,7 +16,7 @@
 
 - Added an S3 generic function `record_print()`, which is similar to `knitr::knit_print()` but for the purpose of printing visible values in `record()`.
 
-- The `record()` funciton gained new arguments `print` and `print.args` to support custom printing functions and arguments.
+- The `record()` function gained new arguments `print` and `print.args` to support custom printing functions and arguments.
 
 - Added a function `md_table()`, which is a minimal Markdown table generator.
 
diff --git a/R/app.R b/R/app.R
index e95db46..ad6ba70 100644
--- a/R/app.R
+++ b/R/app.R
@@ -64,7 +64,7 @@ new_app = function(name, handler, open = interactive(), ports = 4321 + 1:10) {
 #' # with query parameters
 #' xfun::rest_api('https://httpbin.org', '/response-headers', params = list(foo = 'bar'))
 #'
-#' # get the rate limit info from Github
+#' # get the rate limit info from GitHub
 #' xfun::github_api('/rate_limit')
 rest_api = function(...) {
   res = rest_api_raw(...)
diff --git a/R/cran.R b/R/cran.R
index cc5fbdc..822e598 100644
--- a/R/cran.R
+++ b/R/cran.R
@@ -29,7 +29,7 @@ cran_updatable = function(days = 90, maintainer = 'Yihui Xie') {
     sum(d > Sys.Date() - 180) < 6 && d[1] < Sys.Date() - days
   }))
   if (length(pkgs <- names(which(flag))) == 0) return(pkgs)
-  # look into DESCRIPTION in Github repos and see if new version has been pushed
+  # look into DESCRIPTION in GitHub repos and see if new version has been pushed
   info = tools::CRAN_package_db()
   info = info[info$Package %in% pkgs, , drop = FALSE]
   pkgs = info$Package
diff --git a/R/github.R b/R/github.R
index 63ae712..2fd123a 100644
--- a/R/github.R
+++ b/R/github.R
@@ -1,6 +1,6 @@
-#' Get the tags of Github releases of a repository
+#' Get the tags of GitHub releases of a repository
 #'
-#' Use the Github API ([github_api()]) to obtain the tags of the
+#' Use the GitHub API ([github_api()]) to obtain the tags of the
 #' releases.
 #' @param repo The repository name of the form `user/repo`, e.g.,
 #'   `"yihui/xfun"`.
@@ -60,7 +60,7 @@ github_releases2 = function(repo, tag = '', pattern = '[^"&]+') {
 }
 
 #' @details `github_api()` is a wrapper function based on
-#'   `rest_api_raw()` to obtain data from the Github API:
+#'   `rest_api_raw()` to obtain data from the GitHub API:
 #'   <https://docs.github.com/en/rest>. You can provide a personal access
 #'   token (PAT) via the `token` argument, or via one of the environment
 #'   variables \var{GITHUB_PAT}, \var{GITHUB_TOKEN}, \var{GH_TOKEN}. A PAT
@@ -78,7 +78,7 @@ github_api = function(
   names(token) = 'token'
   error = TRUE
   on.exit(if (error && token == '') message(
-    'You may need to save a Github personal access token in one of the ',
+    'You may need to save a GitHub personal access token in one of the ',
     'environment variables: ', paste(envs, collapse = ', ')
   ))
   res = rest_api_raw('https://api.github.com', endpoint, token, params, headers)
@@ -109,7 +109,7 @@ git_test_branch = function() {
 }
 
 gh = function(...) {
-  if (Sys.which('gh') == '') stop('Github CLI not found: https://cli.github.com')
+  if (Sys.which('gh') == '') stop('GitHub CLI not found: https://cli.github.com')
   system2('gh', ...)
 }
 
diff --git a/R/revcheck.R b/R/revcheck.R
index 0d5ee49..f2ab736 100644
--- a/R/revcheck.R
+++ b/R/revcheck.R
@@ -387,21 +387,21 @@ check_deps = function(x, db = available.packages(), which = 'all') {
 #' dependencies is large, they will be split into batches and pushed to crandalf
 #' one by one.
 #'
-#' Due to the time limit of a single job on Github Actions (6 hours), you will
+#' Due to the time limit of a single job on GitHub Actions (6 hours), you will
 #' have to split the large number of reverse dependencies into batches and check
-#' them sequentially on Github (at most 5 jobs in parallel). The function
+#' them sequentially on GitHub (at most 5 jobs in parallel). The function
 #' `crandalf_check()` does this automatically when necessary. It requires
 #' the \command{git} command to be available.
 #'
-#' The function `crandalf_results()` fetches check results from Github
+#' The function `crandalf_results()` fetches check results from GitHub
 #' after all checks are completed, merge the results, and show a full summary of
-#' check results. It requires `gh` (Github CLI:
+#' check results. It requires `gh` (GitHub CLI:
 #' <https://cli.github.com/manual/>) to be installed and you also need to
-#' authenticate with your Github account beforehand.
+#' authenticate with your GitHub account beforehand.
 #' @param pkg The package name of which the reverse dependencies are to be
 #'   checked.
 #' @param size The number of reverse dependencies to be checked in each job.
-#' @param jobs The number of jobs to run in Github Actions (by default, all jobs
+#' @param jobs The number of jobs to run in GitHub Actions (by default, all jobs
 #'   are submitted, but you can choose to submit the first few jobs).
 #' @param which The type of dependencies (see [rev_check()]).
 #' @export
@@ -421,7 +421,7 @@ crandalf_check = function(pkg, size = 400, jobs = Inf, which = 'all') {
     git('push')
     message(
       'Please create a pull request from the branch ', b,
-      ' on Github and re-run xfun::crandalf_check("', pkg, '").'
+      ' on GitHub and re-run xfun::crandalf_check("', pkg, '").'
     )
     return(invisible())
   }
@@ -435,9 +435,9 @@ crandalf_check = function(pkg, size = 400, jobs = Inf, which = 'all') {
       git('push')
     } else if (Sys.which('gh') != '') {
       gh(c('workflow', 'run', 'rev-check.yaml', '--ref', b))
-      message('Triggering rev-check.yaml job against ', b, ' branch in crandalf repo on Github.')
+      message('Triggering rev-check.yaml job against ', b, ' branch in crandalf repo on GitHub.')
     } else {
-      message('Remember to re-run the last job for the package ', pkg, ' on Github.')
+      message('Remember to re-run the last job for the package ', pkg, ' on GitHub.')
     }
     return(invisible())
   }
@@ -460,15 +460,15 @@ crandalf_check = function(pkg, size = 400, jobs = Inf, which = 'all') {
   }
 }
 
-#' @param repo The crandalf repo on Github (of the form `user/repo` such as
+#' @param repo The crandalf repo on GitHub (of the form `user/repo` such as
 #'   `"yihui/crandalf"`). Usually you do not need to specify it, unless you
 #'   are not calling this function inside the crandalf project, because
 #'   \command{gh} should be able to figure out the repo automatically.
 #' @param limit The maximum of records for \command{gh run list} to retrieve.
 #'   You only need a larger number if the check results are very early in the
-#'   Github Action history.
+#'   GitHub Action history.
 #' @param wait Number of seconds to wait if not all jobs have been completed on
-#'   Github. By default, this function checks the status every 5 minutes until
+#'   GitHub. By default, this function checks the status every 5 minutes until
 #'   all jobs are completed. Set `wait` to 0 to disable waiting (and throw
 #'   an error immediately when any jobs are not completed).
 #' @rdname crandalf_check
@@ -476,10 +476,10 @@ crandalf_check = function(pkg, size = 400, jobs = Inf, which = 'all') {
 crandalf_results = function(pkg, repo = NA, limit = 200, wait = 5 * 60) {
   res = crandalf_jobs(pkg, repo, limit)
   if (NROW(res) == 0) {
-    stop('Did not find check results for ', pkg, ' from Github Actions.')
+    stop('Did not find check results for ', pkg, ' from GitHub Actions.')
   }
   if (any(res[, 1] != 'completed')) {
-    if (wait <= 0) stop('Please wait till all jobs have been completed on Github Actions.')
+    if (wait <= 0) stop('Please wait till all jobs have been completed on GitHub Actions.')
     status = NULL
     repeat {
       res = crandalf_jobs(pkg, repo, limit)
@@ -499,7 +499,7 @@ crandalf_results = function(pkg, repo = NA, limit = 200, wait = 5 * 60) {
   res = res[i, , drop = FALSE]
   res = res[res[, 2] == 'failure', , drop = FALSE]
   if (NROW(res) == 0) {
-    stop('Did not find any failed results on Github Actions.')
+    stop('Did not find any failed results on GitHub Actions.')
   }
   for (i in seq_len(nrow(res))) {
     message('Downloading check results (', i, '/', nrow(res), ')')
diff --git a/R/utils.R b/R/utils.R
index 07f52ea..194c53a 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -217,7 +217,7 @@ try_error = function(expr) {
 #' @param .pause The number of seconds to wait before the next attempt.
 #' @export
 #' @examplesIf interactive()
-#' # read the Github releases info of the repo yihui/xfun
+#' # read the GitHub releases info of the repo yihui/xfun
 #' xfun::retry(xfun::github_releases, 'yihui/xfun')
 retry = function(fun, ..., .times = 3, .pause = 5) {
   for (i in seq_len(.times)) {
diff --git a/man/crandalf_check.Rd b/man/crandalf_check.Rd
index 675a24d..be27472 100644
--- a/man/crandalf_check.Rd
+++ b/man/crandalf_check.Rd
@@ -15,22 +15,22 @@ checked.}
 
 \item{size}{The number of reverse dependencies to be checked in each job.}
 
-\item{jobs}{The number of jobs to run in Github Actions (by default, all jobs
+\item{jobs}{The number of jobs to run in GitHub Actions (by default, all jobs
 are submitted, but you can choose to submit the first few jobs).}
 
 \item{which}{The type of dependencies (see \code{\link[=rev_check]{rev_check()}}).}
 
-\item{repo}{The crandalf repo on Github (of the form \code{user/repo} such as
+\item{repo}{The crandalf repo on GitHub (of the form \code{user/repo} such as
 \code{"yihui/crandalf"}). Usually you do not need to specify it, unless you
 are not calling this function inside the crandalf project, because
 \command{gh} should be able to figure out the repo automatically.}
 
 \item{limit}{The maximum of records for \command{gh run list} to retrieve.
 You only need a larger number if the check results are very early in the
-Github Action history.}
+GitHub Action history.}
 
 \item{wait}{Number of seconds to wait if not all jobs have been completed on
-Github. By default, this function checks the status every 5 minutes until
+GitHub. By default, this function checks the status every 5 minutes until
 all jobs are completed. Set \code{wait} to 0 to disable waiting (and throw
 an error immediately when any jobs are not completed).}
 }
@@ -41,15 +41,15 @@ dependencies is large, they will be split into batches and pushed to crandalf
 one by one.
 }
 \details{
-Due to the time limit of a single job on Github Actions (6 hours), you will
+Due to the time limit of a single job on GitHub Actions (6 hours), you will
 have to split the large number of reverse dependencies into batches and check
-them sequentially on Github (at most 5 jobs in parallel). The function
+them sequentially on GitHub (at most 5 jobs in parallel). The function
 \code{crandalf_check()} does this automatically when necessary. It requires
 the \command{git} command to be available.
 
-The function \code{crandalf_results()} fetches check results from Github
+The function \code{crandalf_results()} fetches check results from GitHub
 after all checks are completed, merge the results, and show a full summary of
-check results. It requires \code{gh} (Github CLI:
+check results. It requires \code{gh} (GitHub CLI:
 \url{https://cli.github.com/manual/}) to be installed and you also need to
-authenticate with your Github account beforehand.
+authenticate with your GitHub account beforehand.
 }
diff --git a/man/github_releases.Rd b/man/github_releases.Rd
index c7b3d42..034d5d9 100644
--- a/man/github_releases.Rd
+++ b/man/github_releases.Rd
@@ -2,7 +2,7 @@
 % Please edit documentation in R/github.R
 \name{github_releases}
 \alias{github_releases}
-\title{Get the tags of Github releases of a repository}
+\title{Get the tags of GitHub releases of a repository}
 \usage{
 github_releases(
   repo,
@@ -27,7 +27,7 @@ returned.}
 A character vector of (GIT) tags.
 }
 \description{
-Use the Github API (\code{\link[=github_api]{github_api()}}) to obtain the tags of the
+Use the GitHub API (\code{\link[=github_api]{github_api()}}) to obtain the tags of the
 releases.
 }
 \examples{\dontshow{if (interactive()) (if (getRversion() >= "3.4") withAutoprint else force)(\{ # examplesIf}
diff --git a/man/rest_api.Rd b/man/rest_api.Rd
index 05afc3b..0ada58b 100644
--- a/man/rest_api.Rd
+++ b/man/rest_api.Rd
@@ -58,7 +58,7 @@ method. If you need to use other HTTP methods (such as \samp{POST}), you have
 to use other packages such as \pkg{curl} and \pkg{httr}.
 
 \code{github_api()} is a wrapper function based on
-\code{rest_api_raw()} to obtain data from the Github API:
+\code{rest_api_raw()} to obtain data from the GitHub API:
 \url{https://docs.github.com/en/rest}. You can provide a personal access
 token (PAT) via the \code{token} argument, or via one of the environment
 variables \var{GITHUB_PAT}, \var{GITHUB_TOKEN}, \var{GH_TOKEN}. A PAT
@@ -76,7 +76,7 @@ xfun::rest_api("https://httpbin.org", "/headers", "OPEN SESAME!")
 # with query parameters
 xfun::rest_api("https://httpbin.org", "/response-headers", params = list(foo = "bar"))
 
-# get the rate limit info from Github
+# get the rate limit info from GitHub
 xfun::github_api("/rate_limit")
 \dontshow{\}) # examplesIf}
 }
diff --git a/man/retry.Rd b/man/retry.Rd
index f439bfd..5d8a6ca 100644
--- a/man/retry.Rd
+++ b/man/retry.Rd
@@ -24,7 +24,7 @@ One application of this function is to download a web resource. Since the
 download might fail sometimes, you may want to retry it for a few more times.
 }
 \examples{\dontshow{if (interactive()) (if (getRversion() >= "3.4") withAutoprint else force)(\{ # examplesIf}
-# read the Github releases info of the repo yihui/xfun
+# read the GitHub releases info of the repo yihui/xfun
 xfun::retry(xfun::github_releases, "yihui/xfun")
 \dontshow{\}) # examplesIf}
 }
diff --git a/tests/test-ci.R b/tests/test-ci.R
index ef9d619..d140782 100644
--- a/tests/test-ci.R
+++ b/tests/test-ci.R
@@ -1,2 +1,2 @@
-# tests to run on CI servers (e.g. Github Actions)
+# tests to run on CI servers (e.g. GitHub Actions)
 if (tolower(Sys.getenv('CI')) == 'true') testit::test_pkg('xfun', 'test-ci')
diff --git a/vignettes/xfun.Rmd b/vignettes/xfun.Rmd
index 7580b89..360ac6b 100644
--- a/vignettes/xfun.Rmd
+++ b/vignettes/xfun.Rmd
@@ -24,7 +24,7 @@ library(xfun)
 
 After writing about 20 R packages, I found I had accumulated several utility functions that I used across different packages, so I decided to extract them into a separate package. Previously I had been using the evil triple-colon `:::` to access these internal utility functions. Now with **xfun**, these functions have been exported, and more importantly, documented. It should be better to use them under the sun instead of in the dark.
 
-This page shows examples of a subset of functions in this package. For a full list of functions, see the help page `help(package = 'xfun')`. The source package is available on Github: https://github.com/yihui/xfun.
+This page shows examples of a subset of functions in this package. For a full list of functions, see the help page `help(package = 'xfun')`. The source package is available on GitHub: https://github.com/yihui/xfun.
 
 ## No more partial matching for lists!