diff --git a/.Rbuildignore b/.Rbuildignore
index 4548e5d..34918a1 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -12,3 +12,4 @@
 ^codecov\.yml$
 ^LICENSE\.md$
 ^screencast.gif$
+^debugme\.Rproj$
diff --git a/DESCRIPTION b/DESCRIPTION
index dba6d43..747f4a9 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -18,7 +18,6 @@ Imports:
     grDevices
 Suggests:
     covr,
-    mockery,
     R6,
     testthat (>= 3.0.0),
     withr
diff --git a/R/colors.R b/R/colors.R
index 99c5b03..c8a09a2 100644
--- a/R/colors.R
+++ b/R/colors.R
@@ -15,7 +15,11 @@ initialize_colors <- function(debug_pkgs) {
     names = debug_pkgs
   )
 
-  assign("palette", palette, envir = debug_data)
+  assign_debug("palette", palette)
+}
+
+assign_debug <- function(x, value) {
+  assign(x, value, envir = debug_data)
 }
 
 #' @importFrom crayon make_style
diff --git a/R/debug.R b/R/debug.R
index 1afdeda..d480d4f 100644
--- a/R/debug.R
+++ b/R/debug.R
@@ -149,7 +149,11 @@ get_timestamp_diff <- function() {
 }
 
 get_timestamp_stamp <- function() {
-  paste0(format_date(Sys.time()), " ")
+  paste0(format_date(systime()), " ")
+}
+
+systime <- function() {
+  Sys.time()
 }
 
 format_date <- function(date) {
diff --git a/R/package.R b/R/package.R
index 6169d36..8ce3252 100644
--- a/R/package.R
+++ b/R/package.R
@@ -100,7 +100,7 @@ debugme <- function(env = topenv(parent.frame()),
 
   refresh_pkg_info()
 
-  if (!is_debugged(pkg)) return()
+  if (!is_debugged2(pkg)) return()
 
   should_instrument <- function(x) {
     obj <- get(x, envir = env)
@@ -118,6 +118,9 @@ debugme <- function(env = topenv(parent.frame()),
 is_debugged <- function(pkg) {
   pkg %in% names(debug_data$palette)
 }
+# To allow targetted mocking.
+is_debugged2 <- is_debugged
+
 
 debug_data <- new.env()
 debug_data$timestamp <- NULL
diff --git a/debugme.Rproj b/debugme.Rproj
new file mode 100644
index 0000000..5d79cb7
--- /dev/null
+++ b/debugme.Rproj
@@ -0,0 +1,18 @@
+Version: 1.0
+
+RestoreWorkspace: No
+SaveWorkspace: No
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source
+PackageRoxygenize: rd,collate,namespace
diff --git a/tests/testthat/test-colors.R b/tests/testthat/test-colors.R
index 4167122..34dcd6e 100644
--- a/tests/testthat/test-colors.R
+++ b/tests/testthat/test-colors.R
@@ -2,8 +2,11 @@ test_that("color palette is fine", {
 
   val <- NULL
 
-  mockery::stub(initialize_colors, "assign",
-                function(x, value, envir, ...) val <<- value)
+  local_mocked_bindings(
+    assign_debug = function(x, value) {
+      val <<- value
+    }
+  )
   initialize_colors(c("foo", "bar"))
   expect_equal(names(val), c("foo", "bar"))
   expect_true(all(val %in% grDevices::colors()))
@@ -16,9 +19,10 @@ test_that("color palette is fine", {
 ## Quite an artificial test case...
 
 test_that("get a package style", {
-
-  mockery::stub(get_package_style, "is_debugged", function(...) TRUE)
-  mockery::stub(get_package_style, "make_style", function(x) substitute(x))
+  local_mocked_bindings(
+    is_debugged = function(...) TRUE,
+    make_style = function(x) substitute(x)
+  )
   ret <- get_package_style("pkg")
   expect_equal(ret, quote(debug_data$palette[pkg]))
 })
diff --git a/tests/testthat/test-debug.R b/tests/testthat/test-debug.R
index 22eff85..0796a14 100644
--- a/tests/testthat/test-debug.R
+++ b/tests/testthat/test-debug.R
@@ -1,20 +1,20 @@
 test_that("debug indent", {
   f1 <- function() {
-      debug("f1")
-      f2()
+    debug("f1")
+    f2()
   }
-
+  
   f2 <- function() {
-      debug("f2.1")
-      f3()
-      debug("f2.2")
+    debug("f2.1")
+    f3()
+    debug("f2.2")
   }
   f3 <- function() {
-      debug("f3")
+    debug("f3")
   }
-
+  
   out <- capture_output(eval({ debug("f0.1"); f1(); f2(); debug("f0.2")}))
-
+  
   expect_match(out, 'debugme f0.1', fixed = TRUE)
   expect_match(out, 'debugme +-f1', fixed = TRUE)
   expect_match(out, 'debugme   +-f2.1', fixed = TRUE)
@@ -23,12 +23,12 @@ test_that("debug indent", {
   expect_match(out, 'debugme +-f2.1', fixed = TRUE)
   expect_match(out, 'debugme  -f2.2', fixed = TRUE)
   expect_match(out, 'debugme f0.2', fixed = TRUE)
-
+  
   out <- withr::with_envvar(
     c(DEBUGME_SHOW_STACK = "no"),
     capture_output(eval({ debug("f0.1"); f1(); f2(); debug("f0.2")}))
   )
-
+  
   expect_match(out, 'debugme f0.1', fixed = TRUE)
   expect_match(out, 'debugme f1', fixed = TRUE)
   expect_match(out, 'debugme f2.1', fixed = TRUE)
@@ -40,8 +40,9 @@ test_that("debug indent", {
 })
 
 test_that("debug levels", {
-
-  mockery::stub(debug, "get_package_debug_level", 1)
+  local_mocked_bindings(
+    get_package_debug_level = function(...) 1
+  )
   env <- new.env()
   env$f1 <- function() debug("foobar", level = 1)
   env$f2 <- function() debug("baz", level = 2)
@@ -65,10 +66,10 @@ test_that("format_date", {
 })
 
 test_that("get_timestamp_stamp", {
-
+  
   mytime <- structure(1477967634, class = c("POSIXct", "POSIXt"),
                       tzone = "UTC")
-  mockery::stub(get_timestamp_stamp, "Sys.time", mytime)
+  local_mocked_bindings(systime = function() mytime)
   expect_equal(
     get_timestamp_stamp(),
     "2016-11-01T02:33:54.54.000+00:00 "
@@ -78,16 +79,16 @@ test_that("get_timestamp_stamp", {
 test_that("debugging to a file", {
   tmp <- tempfile()
   on.exit(unlink(tmp), add = TRUE)
-
+  
   on.exit(initialize_output_file(), add = TRUE)
   on.exit(try(close(debug_data$output_fd), silent = TRUE), add = TRUE)
-
+  
   withr::with_envvar(c(DEBUGME_OUTPUT_FILE = tmp), {
     initialize_output_file()
   })
   debug("hello world!", "foobar")
   debug("hello again!", "foo")
-
+  
   log <- readLines(tmp)
   expect_match(log[1], "^foobar hello world!")
   expect_match(log[2], "^foo hello again!")
@@ -97,16 +98,16 @@ test_that("debugging to a directory", {
   tmp <- tempfile()
   dir.create(tmp)
   on.exit(unlink(tmp, recursive = TRUE), add = TRUE)
-
+  
   on.exit(initialize_output_file(), add = TRUE)
   on.exit(try(close(debug_data$output_fd), silent = TRUE), add = TRUE)
-
+  
   withr::with_envvar(c(DEBUGME_OUTPUT_DIR = tmp), {
     initialize_output_file()
   })
   debug("hello world!", "foobar")
   debug("hello again!", "foo")
-
+  
   log <- readLines(file.path(tmp, paste0("debugme-", Sys.getpid(), ".log")))
   expect_match(log[1], "^foobar hello world!")
   expect_match(log[2], "^foo hello again!")
diff --git a/tests/testthat/test-levels.R b/tests/testthat/test-levels.R
index b91cfac..0a5d128 100644
--- a/tests/testthat/test-levels.R
+++ b/tests/testthat/test-levels.R
@@ -27,7 +27,7 @@ test_that("log levels work properly", {
   )
 
   for (pkg_level in 1:6) {
-    mockery::stub(debug, "get_package_debug_level", pkg_level)
+    local_mocked_bindings(get_package_debug_level = function(...) pkg_level)
     for (idx in seq_along(fs)) {
       if (idx <= pkg_level) {
         expect_output(fs[[idx]][[2]](), fs[[idx]][[1]])
diff --git a/tests/testthat/test-package.R b/tests/testthat/test-package.R
index b3f30a0..cacc5b4 100644
--- a/tests/testthat/test-package.R
+++ b/tests/testthat/test-package.R
@@ -2,7 +2,9 @@ test_that(".onLoad", {
 
   val <- NULL
 
-  mockery::stub(refresh_pkg_info, "initialize_colors", function(pkgs) val <<- pkgs)
+  local_mocked_bindings(
+    initialize_colors = function(pkgs) val <<- pkgs
+  )
   withr::with_envvar(
     c("DEBUGME" = c("foo,bar")),
     refresh_pkg_info()
@@ -20,7 +22,7 @@ test_that("debugme", {
 
   expect_silent(debugme(env))
 
-  mockery::stub(debugme, "is_debugged", TRUE)
+  local_mocked_bindings(is_debugged2 = function(...) TRUE)
   debugme(env)
 
   expect_silent(env$f1())
@@ -35,7 +37,7 @@ test_that("instrument environments", {
   env$env <- new.env()
   env$env$fun <- function() { "!DEBUG coocoo" }
 
-  mockery::stub(debugme, "is_debugged", TRUE)
+  local_mocked_bindings(is_debugged2 = function(...) TRUE)
   expect_silent(debugme(env))
 
   expect_output(env$env$fun(), "coocoo")
@@ -61,7 +63,7 @@ test_that("instrument R6 classes", {
     )
   )
 
-  mockery::stub(debugme, "is_debugged", TRUE)
+  local_mocked_bindings(is_debugged2 = function(...) TRUE)
   expect_silent(debugme(env))
 
   expect_output(x <- env$class$new("mrx"), "debugme.*creating mrx")