diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 19688e3a..d46a7bd7 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -27,8 +27,6 @@ jobs:
           - {os: macos-latest,   r: 'release'}
 
           - {os: windows-latest, r: 'release'}
-          # Use 3.6 to trigger usage of RTools35
-          - {os: windows-latest, r: '3.6'}
           # use 4.1 to check with rtools40's older compiler
           - {os: windows-latest, r: '4.1'}
 
diff --git a/DESCRIPTION b/DESCRIPTION
index 04d5d6a7..f6e9ef69 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -21,7 +21,7 @@ License: MIT + file LICENSE
 URL: https://poissonconsulting.github.io/chk/, https://github.com/poissonconsulting/chk/
 BugReports: https://github.com/poissonconsulting/chk/issues/
 Depends: 
-    R (>= 3.6)
+    R (>= 4.0)
 Imports: 
     lifecycle,
     methods,
diff --git a/NEWS.md b/NEWS.md
index 3700d13e..5ff75f5b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -2,10 +2,10 @@
 
 # chk 0.9.2
 
+- No longer support R 3.6 as dependency `evaluate` of suggested dependency `testthat` switched to 4.0.
 - `check_key()` now preserves active status of `sfc` column of `sf` object.
 - Fixed `vld_join(by = NULL)` with R 4.5.
 
-
 # chk 0.9.1
 
 - Fixes incorrect error message with `chk_null_or()` when `vld = chk::vld_xx`.
diff --git a/R/internal.R b/R/internal.R
index 68ea62cd..552d9b45 100644
--- a/R/internal.R
+++ b/R/internal.R
@@ -14,9 +14,3 @@
 
   anyDuplicated(x)
 }
-
-# remove when no longer support R < 3.6.0
-str2lang <- function(text) {
-  ex <- parse(text = text, keep.source = FALSE)
-  ex[[1L]]
-}