diff --git a/.travis.yml b/.travis.yml
index a5bf180e6c..0349bff0f1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,11 +18,11 @@ matrix:
       provider: script
       script: Rscript -e 'pkgdown::deploy_site_github(verbose = TRUE)'
       skip_cleanup: true
-  - r: oldrel
+  - r: 3.5
+  - r: 3.4
+  - r: 3.3
   - r: 3.2
     env: R_REMOTES_NO_ERRORS_FROM_WARNINGS=true
-  - r: 3.1
-    env: R_REMOTES_NO_ERRORS_FROM_WARNINGS=true
 
 # environment variables set for all builds
 env:
diff --git a/DESCRIPTION b/DESCRIPTION
index 3a30d17cec..b7b8b39104 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -17,7 +17,7 @@ Authors@R: c(
     person("RStudio", role = c("cph"))
     )
 Depends:
-    R (>= 3.1)
+    R (>= 3.2)
 Imports: 
     digest,
     grDevices,
@@ -27,7 +27,7 @@ Imports:
     MASS,
     mgcv,
     reshape2,
-    rlang (>= 0.3.0),
+    rlang (>= 0.3.1),
     scales (>= 0.5.0),
     stats,
     tibble,
diff --git a/NAMESPACE b/NAMESPACE
index 41405a260e..b541016163 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -118,6 +118,7 @@ S3method(widthDetails,titleGrob)
 S3method(widthDetails,zeroGrob)
 export("%+%")
 export("%+replace%")
+export(":=")
 export(.data)
 export(.pt)
 export(.stroke)
@@ -237,7 +238,9 @@ export(annotation_logticks)
 export(annotation_map)
 export(annotation_raster)
 export(arrow)
+export(as_label)
 export(as_labeller)
+export(as_name)
 export(autolayer)
 export(autoplot)
 export(benchplot)
@@ -579,6 +582,15 @@ import(gtable)
 import(rlang)
 import(scales)
 importFrom(lazyeval,f_eval)
+importFrom(rlang,":=")
+importFrom(rlang,.data)
+importFrom(rlang,as_label)
+importFrom(rlang,as_name)
+importFrom(rlang,enquo)
+importFrom(rlang,enquos)
+importFrom(rlang,expr)
+importFrom(rlang,sym)
+importFrom(rlang,syms)
 importFrom(stats,setNames)
 importFrom(tibble,tibble)
 importFrom(utils,.DollarNames)
diff --git a/NEWS.md b/NEWS.md
index 4699714a4a..db819b1ab3 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -7,6 +7,9 @@ extension developers if they have relied on internals that have been changed.
 This release also sees the addition of Hiroaki Yutani (@yutannihilation) to the 
 core developer team.
 
+With the release of R 3.6, ggplot2 now requires the R version to be at least 3.2,
+as the tidyverse is committed to support 5 major versions of R.
+
 ## New features
 
 * This release includes a range of internal changes that speeds up plot 
diff --git a/R/utilities-tidy-eval.R b/R/utilities-tidy-eval.R
index 89b6032245..56458ce2b3 100644
--- a/R/utilities-tidy-eval.R
+++ b/R/utilities-tidy-eval.R
@@ -6,30 +6,55 @@
 #'   \code{\link[rlang]{syms}()} creates a list of symbols from a
 #'   character vector.
 #'
-#' * \code{\link[rlang]{expr}()} and \code{\link[rlang]{quo}()} quote
-#'   one expression. `quo()` wraps the quoted expression in a quosure.
+#' * \code{\link[rlang]{enquo}()} and \code{\link[rlang]{enquos}()}
+#'   delay the execution of one or several function arguments.
+#'   \code{enquo()} returns a single quoted expression, which is like
+#'   a blueprint for the delayed computation. \code{enquos()} returns
+#'   a list of such quoted expressions.
 #'
-#'   The plural variants \code{\link[rlang]{exprs}()} and
-#'   \code{\link[rlang]{quos}()} return a list of quoted expressions or
-#'   quosures.
+#' * \code{\link[rlang]{expr}()} quotes a new expression _locally_. It
+#'   is mostly useful to build new expressions around arguments
+#'   captured with [enquo()] or [enquos()]:
+#'   \code{expr(mean(!!enquo(arg), na.rm = TRUE))}.
 #'
-#' * \code{\link[rlang]{enexpr}()} and \code{\link[rlang]{enquo}()}
-#'   capture the expression supplied as argument by the user of the
-#'   current function (`enquo()` wraps this expression in a quosure).
+#' * \code{\link[rlang]{as_name}()} transforms a quoted variable name
+#'   into a string. Supplying something else than a quoted variable
+#'   name is an error.
 #'
-#'   \code{\link[rlang]{enexprs}()} and \code{\link[rlang]{enquos}()}
-#'   capture multiple expressions supplied as arguments, including
-#'   `...`.
+#'   That's unlike \code{\link[rlang]{as_label}()} which also returns
+#'   a single string but supports any kind of R object as input,
+#'   including quoted function calls and vectors. Its purpose is to
+#'   summarise that object into a single label. That label is often
+#'   suitable as a default name.
+#'
+#'   If you don't know what a quoted expression contains (for instance
+#'   expressions captured with \code{enquo()} could be a variable
+#'   name, a call to a function, or an unquoted constant), then use
+#'   \code{as_label()}. If you know you have quoted a simple variable
+#'   name, or would like to enforce this, use \code{as_name()}.
+#'
+#' To learn more about tidy eval and how to use these tools, visit
+#' \url{http://tidyeval.tidyverse.org} and the
+#' \href{https://adv-r.hadley.nz/metaprogramming.html}{Metaprogramming
+#' section} of \href{https://adv-r.hadley.nz}{Advanced R}.
 #'
 #' @md
 #' @name tidyeval
 #' @keywords internal
-#' @aliases          quo quos enquo enquos quo_name
-#'                   sym ensym syms ensyms
-#'                   expr exprs enexpr enexprs
-#'                   .data
-#' @export           quo quos enquo enquos quo_name
-#' @export           sym ensym syms ensyms
-#' @export           expr enexpr enexprs
-#' @export           .data
+#' @importFrom rlang expr enquo enquos sym syms .data := as_name as_label
+#' @aliases expr enquo enquos sym syms .data := as_name as_label
+#' @export expr enquo enquos sym syms .data := as_name as_label
+NULL
+
+
+#' Other tidy eval tools
+#'
+#' These tidy eval tools are no longer recommended for normal usage,
+#' but are still exported for compatibility. See [`?tidyeval`][tidyeval]
+#' for the recommended tools.
+#'
+#' @keywords internal
+#' @name tidyeval-compat
+#' @aliases quo quos quo_name ensym ensyms enexpr enexprs
+#' @export quo quos quo_name ensym ensyms enexpr enexprs
 NULL
diff --git a/man/tidyeval-compat.Rd b/man/tidyeval-compat.Rd
new file mode 100644
index 0000000000..1a9c581d6c
--- /dev/null
+++ b/man/tidyeval-compat.Rd
@@ -0,0 +1,18 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/utilities-tidy-eval.R
+\name{tidyeval-compat}
+\alias{tidyeval-compat}
+\alias{quo}
+\alias{quos}
+\alias{quo_name}
+\alias{ensym}
+\alias{ensyms}
+\alias{enexpr}
+\alias{enexprs}
+\title{Other tidy eval tools}
+\description{
+These tidy eval tools are no longer recommended for normal usage,
+but are still exported for compatibility. See \code{\link[=tidyeval]{?tidyeval}}
+for the recommended tools.
+}
+\keyword{internal}
diff --git a/man/tidyeval.Rd b/man/tidyeval.Rd
index b2f1b2edae..f78f9f5285 100644
--- a/man/tidyeval.Rd
+++ b/man/tidyeval.Rd
@@ -2,39 +2,50 @@
 % Please edit documentation in R/utilities-tidy-eval.R
 \name{tidyeval}
 \alias{tidyeval}
-\alias{quo}
-\alias{quos}
+\alias{expr}
 \alias{enquo}
 \alias{enquos}
-\alias{quo_name}
 \alias{sym}
-\alias{ensym}
 \alias{syms}
-\alias{ensyms}
-\alias{expr}
-\alias{exprs}
-\alias{enexpr}
-\alias{enexprs}
 \alias{.data}
+\alias{:=}
+\alias{as_name}
+\alias{as_label}
 \title{Tidy eval helpers}
 \description{
 \itemize{
 \item \code{\link[rlang]{sym}()} creates a symbol from a string and
 \code{\link[rlang]{syms}()} creates a list of symbols from a
 character vector.
-\item \code{\link[rlang]{expr}()} and \code{\link[rlang]{quo}()} quote
-one expression. \code{quo()} wraps the quoted expression in a quosure.
+\item \code{\link[rlang]{enquo}()} and \code{\link[rlang]{enquos}()}
+delay the execution of one or several function arguments.
+\code{enquo()} returns a single quoted expression, which is like
+a blueprint for the delayed computation. \code{enquos()} returns
+a list of such quoted expressions.
+\item \code{\link[rlang]{expr}()} quotes a new expression \emph{locally}. It
+is mostly useful to build new expressions around arguments
+captured with \code{\link[=enquo]{enquo()}} or \code{\link[=enquos]{enquos()}}:
+\code{expr(mean(!!enquo(arg), na.rm = TRUE))}.
+\item \code{\link[rlang]{as_name}()} transforms a quoted variable name
+into a string. Supplying something else than a quoted variable
+name is an error.
 
-The plural variants \code{\link[rlang]{exprs}()} and
-\code{\link[rlang]{quos}()} return a list of quoted expressions or
-quosures.
-\item \code{\link[rlang]{enexpr}()} and \code{\link[rlang]{enquo}()}
-capture the expression supplied as argument by the user of the
-current function (\code{enquo()} wraps this expression in a quosure).
+That's unlike \code{\link[rlang]{as_label}()} which also returns
+a single string but supports any kind of R object as input,
+including quoted function calls and vectors. Its purpose is to
+summarise that object into a single label. That label is often
+suitable as a default name.
 
-\code{\link[rlang]{enexprs}()} and \code{\link[rlang]{enquos}()}
-capture multiple expressions supplied as arguments, including
-\code{...}.
+If you don't know what a quoted expression contains (for instance
+expressions captured with \code{enquo()} could be a variable
+name, a call to a function, or an unquoted constant), then use
+\code{as_label()}. If you know you have quoted a simple variable
+name, or would like to enforce this, use \code{as_name()}.
 }
+
+To learn more about tidy eval and how to use these tools, visit
+\url{http://tidyeval.tidyverse.org} and the
+\href{https://adv-r.hadley.nz/metaprogramming.html}{Metaprogramming
+section} of \href{https://adv-r.hadley.nz}{Advanced R}.
 }
 \keyword{internal}