diff --git a/DESCRIPTION b/DESCRIPTION
index 09c0e79e2..fd84de697 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -44,7 +44,7 @@ Suggests:
 Enhances: 
     winch
 Encoding: UTF-8
-RoxygenNote: 7.3.1
+RoxygenNote: 7.3.2
 Roxygen: list(markdown = TRUE)
 URL: https://rlang.r-lib.org, https://github.com/r-lib/rlang
 BugReports: https://github.com/r-lib/rlang/issues
diff --git a/NEWS.md b/NEWS.md
index d88a55d41..d9e0aabae 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,8 +1,11 @@
 # rlang (development version)
 
+* `env_browse()` and `env_is_browsed()` are now defunct as they require an API
+  that is no longer available to packages (#1727).
+
 * `env_unlock()` is now defunct because recent versions of R no long
-  make it possible to unlock an environment. Make sure to use an up-to-date
-  version of pkgload (>= 1.4.0) following this change.
+  make it possible to unlock an environment (#1705). Make sure to use an
+  up-to-date version of pkgload (>= 1.4.0) following this change.
 
 
 # rlang 1.1.4
diff --git a/R/env.R b/R/env.R
index dfdfc875f..4a5bd24f1 100644
--- a/R/env.R
+++ b/R/env.R
@@ -566,8 +566,8 @@ env_is_locked <- function(env) {
 env_unlock <- function(env) {
   msg <- "`env_unlock()` is defunct as of rlang 1.1.5"
 
-  old_pkgload_running <- 
-    "pkgload" %in% loadedNamespaces() && 
+  old_pkgload_running <-
+    "pkgload" %in% loadedNamespaces() &&
     some(sys.frames(), function(env) identical(topenv(env), ns_env("pkgload"))) &&
     utils::packageVersion("pkgload") <= "1.3.4"
 
@@ -754,6 +754,8 @@ str.rlang_envs <- function(object, ...) {
 #'
 #' @description
 #'
+#' `r lifecycle::badge("defunct")`
+#'
 #' * `env_browse(env)` is equivalent to evaluating `browser()` in
 #'   `env`. It persistently sets the environment for step-debugging.
 #'   Supply `value = FALSE` to disable browsing.
@@ -767,12 +769,12 @@ str.rlang_envs <- function(object, ...) {
 #'   `env_is_browsed()` (a logical), invisibly.
 #' @export
 env_browse <- function(env, value = TRUE) {
-  invisible(.Call(ffi_env_browse, env, value))
+  abort("`env_browse()` is defunct as of rlang 1.2.0 because R no longer supports it")
 }
 #' @rdname env_browse
 #' @export
 env_is_browsed <- function(env) {
-  .Call(ffi_env_is_browsed, env)
+  abort("`env_is_browsed()` is defunct as of rlang 1.2.0 because R no longer supports it")
 }
 
 #' Is frame environment user facing?
diff --git a/man/env_browse.Rd b/man/env_browse.Rd
index c3a73c769..ad41cf4b4 100644
--- a/man/env_browse.Rd
+++ b/man/env_browse.Rd
@@ -19,6 +19,7 @@ env_is_browsed(env)
 \code{env_is_browsed()} (a logical), invisibly.
 }
 \description{
+\ifelse{html}{\href{https://lifecycle.r-lib.org/articles/stages.html#defunct}{\figure{lifecycle-defunct.svg}{options: alt='[Defunct]'}}}{\strong{[Defunct]}}
 \itemize{
 \item \code{env_browse(env)} is equivalent to evaluating \code{browser()} in
 \code{env}. It persistently sets the environment for step-debugging.
diff --git a/src/internal/exported.c b/src/internal/exported.c
index 5e13cbf6a..9623a3453 100644
--- a/src/internal/exported.c
+++ b/src/internal/exported.c
@@ -511,26 +511,6 @@ r_obj* ffi_env_bind_list(r_obj* env, r_obj* names, r_obj* data) {
   return r_null;
 }
 
-r_obj* ffi_env_browse(r_obj* env, r_obj* value) {
-  if (r_typeof(env) != R_TYPE_environment) {
-    r_abort("`env` must be an environment.");
-  }
-  if (!r_is_bool(value)) {
-    r_abort("`value` must be a single logical value.");
-  }
-
-  r_obj* old = r_lgl(RDEBUG(env));
-  SET_RDEBUG(env, r_lgl_get(value, 0));
-  return old;
-}
-
-r_obj* ffi_env_is_browsed(r_obj* env) {
-  if (r_typeof(env) != R_TYPE_environment) {
-    r_abort("`env` must be an environment.");
-  }
-  return r_lgl(RDEBUG(env));
-}
-
 r_obj* ffi_ns_registry_env(void) {
   return R_NamespaceRegistry;
 }
diff --git a/src/internal/init.c b/src/internal/init.c
index 88588cc94..7688ce414 100644
--- a/src/internal/init.c
+++ b/src/internal/init.c
@@ -74,7 +74,6 @@ static const R_CallMethodDef r_callables[] = {
   {"ffi_env_bind",                     (DL_FUNC) &ffi_env_bind, 5},
   {"ffi_env_bind_list",                (DL_FUNC) &ffi_env_bind_list, 3},
   {"ffi_env_binding_types",            (DL_FUNC) &r_env_binding_types, 2},
-  {"ffi_env_browse",                   (DL_FUNC) &ffi_env_browse, 2},
   {"ffi_env_clone",                    (DL_FUNC) &r_env_clone, 2},
   {"ffi_env_coalesce",                 (DL_FUNC) &ffi_env_coalesce, 2},
   {"ffi_env_frame",                    (DL_FUNC) &ffi_env_frame, 1},
@@ -83,7 +82,6 @@ static const R_CallMethodDef r_callables[] = {
   {"ffi_env_has",                      (DL_FUNC) &ffi_env_has, 3},
   {"ffi_env_hash_table",               (DL_FUNC) &ffi_env_hash_table, 1},
   {"ffi_env_inherits",                 (DL_FUNC) &ffi_env_inherits, 2},
-  {"ffi_env_is_browsed",               (DL_FUNC) &ffi_env_is_browsed, 1},
   {"ffi_env_poke",                     (DL_FUNC) &ffi_env_poke, 5},
   {"ffi_env_poke_parent",              (DL_FUNC) &ffi_env_poke_parent, 2},
   {"ffi_env_unbind",                   (DL_FUNC) &ffi_env_unbind, 3},
diff --git a/tests/testthat/test-env.R b/tests/testthat/test-env.R
index f1e38a24d..db390e3c0 100644
--- a/tests/testthat/test-env.R
+++ b/tests/testthat/test-env.R
@@ -519,19 +519,6 @@ test_that("get_env() returns the base namespace for primitive functions (r-lib/d
   expect_identical(get_env(is.null), ns_env("base"))
 })
 
-test_that("can browse environments", {
-  env <- env()
-  expect_false(env_is_browsed(env))
-
-  old <- env_browse(env)
-  expect_false(old)
-  expect_true(env_is_browsed(env))
-
-  old <- env_browse(env, FALSE)
-  expect_true(old)
-  expect_false(env_is_browsed(env))
-})
-
 test_that("env_has() doesn't force active bindings (#1292)", {
   e <- env()
   env_bind_active(e, active = function() abort("forced"))