diff --git a/Mathlib/Tactic/CC/Addition.lean b/Mathlib/Tactic/CC/Addition.lean
index 402aa77e105b8..2b3349c44376a 100644
--- a/Mathlib/Tactic/CC/Addition.lean
+++ b/Mathlib/Tactic/CC/Addition.lean
@@ -1748,7 +1748,7 @@ def propagateProjectionConstructor (p c : Expr) : CCM Unit := do
       unless ← pureIsDefEq (← inferType (pArgs[mkidx]'h)) (← inferType c) do return
       /- Create new projection application using c (e.g., `(x, y).fst`), and internalize it.
         The internalizer will add the new equality. -/
-      let pArgs := pArgs.set ⟨mkidx, h⟩ c
+      let pArgs := pArgs.set mkidx c
       let newP := mkAppN pFn pArgs
       internalizeCore newP none
     else
diff --git a/Mathlib/Tactic/FunProp/RefinedDiscrTree.lean b/Mathlib/Tactic/FunProp/RefinedDiscrTree.lean
index 876dc3a14dc35..1f6cdbcd5f5f6 100644
--- a/Mathlib/Tactic/FunProp/RefinedDiscrTree.lean
+++ b/Mathlib/Tactic/FunProp/RefinedDiscrTree.lean
@@ -875,7 +875,7 @@ where
   loop (i : Nat) : Array α :=
     if h : i < vs.size then
       if v == vs[i] then
-        vs.set ⟨i,h⟩ v
+        vs.set i v
       else
         loop (i+1)
     else
diff --git a/lake-manifest.json b/lake-manifest.json
index d965eb5cdb0eb..56aad3d6219de 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -5,7 +5,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "d9e997fb60f8d4fcbf03270fbb696f7c87ee0e25",
+   "rev": "4fbc598626f02cae3d60708c04a09c311bb60369",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "lean-pr-testing-5988",
@@ -25,10 +25,10 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "45d016d59cf45bcf8493a203e9564cfec5203d9b",
+   "rev": "fa36772c08508c85c9ba531a8865cdeb391631df",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "master",
+   "inputRev": "lean-pr-testing-5988",
    "inherited": false,
    "configFile": "lakefile.toml"},
   {"url": "https://github.com/leanprover-community/ProofWidgets4",
diff --git a/lakefile.lean b/lakefile.lean
index 0fb8c72d4767f..f32677f0edb1b 100644
--- a/lakefile.lean
+++ b/lakefile.lean
@@ -9,7 +9,7 @@ open Lake DSL
 
 require "leanprover-community" / "batteries" @ git "lean-pr-testing-5988"
 require "leanprover-community" / "Qq" @ git "master"
-require "leanprover-community" / "aesop" @ git "master"
+require "leanprover-community" / "aesop" @ git "lean-pr-testing-5988"
 require "leanprover-community" / "proofwidgets" @ git "v0.0.46"
 require "leanprover-community" / "importGraph" @ git "main"
 require "leanprover-community" / "LeanSearchClient" @ git "main"