diff --git a/Shake.hs b/Shake.hs
index 9f7e361cf..18edec950 100755
--- a/Shake.hs
+++ b/Shake.hs
@@ -9,7 +9,8 @@
    --package shake
    --package time
    ghc
--} -- uses the project's current stack resolver
+-}
+-- uses the project's default resolver & extra deps (see stack.yaml)
 {-
 
 One of two project scripts files (Makefile, Shake.hs). This one
diff --git a/stack.yaml b/stack.yaml
index c8e9ac591..5a5ce47a9 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,7 +1,6 @@
 # stack build plan using GHC 8.6.5
 
-resolver: lts-14.4
-#resolver: nightly-2019-07-26
+resolver: lts-14.16
 
 packages:
 - hledger-lib
@@ -16,13 +15,15 @@ nix:
 # allow-newer: true
 
 extra-deps:
-# for testing base-compat 0.11 compatibility:
-- aeson-1.4.6.0
-- aeson-compat-0.3.9
-- attoparsec-iso8601-1.0.1.0
-- base-compat-batteries-0.11.0
-- base-compat-0.11.0
-- http-api-data-0.4.1.1
+# for Shake.hs (regex doesn't support base-compat-0.11):
+- regex-1.0.2.0@rev:1
+# for testing base-compat 0.11 compatibility (mutually exclusive with the above):
+# - aeson-1.4.6.0
+# - aeson-compat-0.3.9
+# - attoparsec-iso8601-1.0.1.0
+# - base-compat-batteries-0.11.0
+# - base-compat-0.11.0
+# - http-api-data-0.4.1.1
 # for hledger-lib:
 # for hledger:
 # for hledger-ui: