diff --git a/stack-exact.yaml b/stack-exact.yaml
deleted file mode 100644
index 6a2e82d8..00000000
--- a/stack-exact.yaml
+++ /dev/null
@@ -1,75 +0,0 @@
-# To use this, the command you want is:
-#  stack runhaskell \
-#    --stack-yaml stack-exact.yaml \
-#    --package extra --package optparse-applicative \
-#    CI.hs -- \
-#    --stack-yaml stack-exact.yaml --ghc-flavor xxx
-# You can add --resolver xxx to the above command to have the effect
-# of overriding the choice of compiler if desired.
-
-resolver: ghc-9.10.1 # base == 4.20
-
-ghc-options:
-  # Try to be quick.
-  "$everything": -O0 -j
-
-extra-deps:
-# Dependencies of ghc-lib-parser & ghc-lib:
-- alex-3.5.1.0
-- happy-1.20.1.1
-# Dependencies for ghc-lib examples:
-- data-array-byte-0.1.0.1
-- hashable-1.4.4.0
-- os-string-2.0.3
-- syb-0.7.2.4
-- uniplate-1.6.13
-- unordered-containers-0.2.20
-# See https://gitlab.haskell.org/ghc/ghc/-/issues/23683
-- unix-2.8.5.1
-- directory-1.3.8.5
-- process-1.6.20.0
-- filepath-1.5.2.0
-- hpc-0.7.0.2
-- Win32-2.14.0.0
-- time-1.12.2
-- semaphore-compat-1.0.0
-# Additional dependencies for CI.hs & ghc-lib-gen:
-- ansi-terminal-1.1
-- ansi-terminal-types-1.1
-- ansi-wl-pprint-1.0.2
-- clock-0.8.4
-- colour-2.3.6
-- extra-1.7.16
-- mintty-0.1.4
-- optparse-applicative-0.18.1.0
-- transformers-compat-0.7.2
-- prettyprinter-1.7.1
-- prettyprinter-ansi-terminal-1.1.3
-- tagged-0.8.8
-# Dependencies (not already covered) for tests
-- call-stack-0.4.0
-- tasty-1.5
-- tasty-hunit-0.10.1
-- typed-process-0.2.11.1
-- utf8-string-1.0.2
-- async-2.2.5
-- temporary-1.3
-- unbounded-delays-0.1.1.1
-- unix-compat-0.7.1
-- wcwidth-0.0.2
-
-flags:
-  mintty:
-    # True for ghc >= 9.6.1 else False.
-    win32-2-13-1: true # Win32 (>=2.13.1)
-  directory:
-    os-string: true
-  unix:
-    os-string: true
-  Win32:
-    os-string: true
-
-# Packages MUST go at the end, since we append to it during the CI.hs
-# script.
-packages:
-- .
diff --git a/stack.yaml b/stack.yaml
deleted file mode 100644
index 19b3d25a..00000000
--- a/stack.yaml
+++ /dev/null
@@ -1,15 +0,0 @@
-resolver: nightly-2023-09-21 # ghc-9.6.2
-
-extra-deps:
-  - Cabal-3.4.0.0
-  - data-array-byte-0.1.0.1
-allow-newer: true
-allow-newer-deps: [ghc-lib-gen]
-
-ghc-options:
-  # try and speed up recompilation on the CI server
-  "$everything": -O0 -j
-
-# Packages MUST go at the end, since we append to it during the CI.hs script
-packages:
-- .