diff --git a/DESCRIPTION b/DESCRIPTION
index e48babe..4f949af 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: xpectr
 Title: Generates Expectations for 'testthat' Unit Testing
-Version: 0.3.0.9000
+Version: 0.4.0
 Authors@R: 
     c(person(given = "Ludvig Renbo",
              family = "Olsen",
diff --git a/NEWS.md b/NEWS.md
index c80ab9f..9910980 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,10 +1,10 @@
-# xpectr 0.3.0.9000
+# xpectr 0.4.0
 
 * `wrapStringAddin()` now wraps short strings in `paste0()` as well. Previously, strings that were too short to be split were not wrapped.
 
 * Adds `insertExpectationsCopyEnvAddin()` addin. Same as `insertExpectationsAddin()` but where code is evaluated in a deep copy of the parent environment. This is especially useful when testing a function that alters non-local variables and has side effects (error/warnings/messages).
 
-* Multiple functions now allow working on a deep copy of the environment. This is useful when testing a function that alters non-local variables. It is disabled by default to save memory.
+* Multiple functions now allow working on a deep copy of the environment (see new `copy_env` argument). This is useful when testing a function that alters non-local variables. It is disabled by default to save memory.
 
 * `gxs_function()` now allows parallelization of the expectation generation process. Requires a backend, as setup with `doParallel::registerDoParallel(4)`. Remember to set `parallel = TRUE` when calling `gxs_function()`.
 
diff --git a/README.Rmd b/README.Rmd
index 3ed9a0c..4669928 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -719,7 +719,8 @@ xpectr::gxs_function(
     "y" = list(),
     "z" = list(10)
   ),
-  identation = 2
+  identation = 2,
+  copy_env = FALSE
 )
 
 #
diff --git a/README.md b/README.md
index af152b0..82d9ee9 100644
--- a/README.md
+++ b/README.md
@@ -793,7 +793,8 @@ xpectr::gxs_function(
     "y" = list(),
     "z" = list(10)
   ),
-  identation = 2
+  identation = 2,
+  copy_env = FALSE
 )
 
 #
diff --git a/cran-comments.md b/cran-comments.md
index 14eeacf..1a020b7 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -1,6 +1,6 @@
 ## Test environments
 * local OS X install, R 3.6.1
-* ubuntu 14.04 (on travis-ci), R 3.6.1
+* ubuntu 14.04 (on travis-ci), R 3.6.3, 4.0.0 and devel
 * win-builder (devel and release)
 
 ## R CMD check results
diff --git a/revdep/README.md b/revdep/README.md
index 429989a..c987431 100644
--- a/revdep/README.md
+++ b/revdep/README.md
@@ -10,13 +10,14 @@
 |collate  |en_US.UTF-8                  |
 |ctype    |en_US.UTF-8                  |
 |tz       |Europe/Copenhagen            |
-|date     |2020-03-31                   |
+|date     |2020-06-18                   |
 
 # Dependencies
 
-|package |old   |new   |Δ  |
-|:-------|:-----|:-----|:--|
-|xpectr  |0.2.0 |0.3.0 |*  |
+|package |old   |new        |Δ  |
+|:-------|:-----|:----------|:--|
+|xpectr  |0.3.0 |0.4.0      |*  |
+|tibble  |NA    |3.0.1.9000 |*  |
 
 # Revdeps
 
diff --git a/revdep/data.sqlite b/revdep/data.sqlite
new file mode 100644
index 0000000..0f8435e
Binary files /dev/null and b/revdep/data.sqlite differ
diff --git a/vignettes/readme.Rmd b/vignettes/readme.Rmd
index f29c7a4..0c8e56a 100644
--- a/vignettes/readme.Rmd
+++ b/vignettes/readme.Rmd
@@ -703,7 +703,8 @@ xpectr::gxs_function(
     "y" = list(),
     "z" = list(10)
   ),
-  identation = 2
+  identation = 2,
+  copy_env = FALSE
 )
 
 #