diff --git a/.github/workflows/bump-plutus-version.yml b/.github/workflows/bump-plutus-version.yml
index a44f56c..48f4eac 100644
--- a/.github/workflows/bump-plutus-version.yml
+++ b/.github/workflows/bump-plutus-version.yml
@@ -28,6 +28,8 @@ jobs:
 
       - name: Change Plutus Versions
         run: |
+          set -o pipefail
+
           PLUTUS_VERSION=${{ github.event.inputs.version }}
 
           # Derive hackage index-state from the flake-pinned hackage commit,
@@ -36,14 +38,22 @@ jobs:
           HACKAGE_EPOCH=$((HACKAGE_EPOCH - 7200))
           HACKAGE_DATE=$(date -u -d "@$HACKAGE_EPOCH" +"%Y-%m-%dT%H:%M:%SZ")
 
-          # For CHaP, use the foliage timestamp of the specific plutus-core version
-          # being bumped. This is the exact index-state at which the package appears
-          # in the CHaP index — independent of CHaP's git commit timestamp, which can
-          # be arbitrarily newer (e.g. ghost automation re-runs with 0 file changes).
+          # For CHaP, read the index that ships inside the flake-pinned repository:
+          # the mtimes of the entries in 01-index.tar.gz ARE the index-states, so
+          # the newest one is the exact latest index-state of the pinned CHaP —
+          # independent of CHaP's git commit timestamp, which can be arbitrarily
+          # newer (e.g. ghost automation re-runs with 0 file changes).
           CHAP_REV=$(jq -r '.nodes.CHaP.locked.rev' flake.lock)
-          CHAP_DATE=$(gh api \
-            "repos/IntersectMBO/cardano-haskell-packages/contents/_sources/plutus-core/${PLUTUS_VERSION}/meta.toml?ref=${CHAP_REV}" \
-            --jq '.content' | base64 -d | grep '^timestamp' | awk '{print $3}' | tr -d '"')
+          CHAP_DATE=$(curl -fsSL \
+            "https://raw.githubusercontent.com/IntersectMBO/cardano-haskell-packages/${CHAP_REV}/01-index.tar.gz" \
+            | tar -tvz --full-time -f - \
+            | grep -oE '[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}' \
+            | sort | tail -1 | sed 's/ /T/;s/$/Z/')
+
+          if [ -z "$CHAP_DATE" ]; then
+            echo "Failed to determine CHaP index-state" >&2
+            exit 1
+          fi
 
           sed -i "s/\(hackage.haskell.org \).*$/\1$HACKAGE_DATE/" cabal.project
           sed -i "s/\(cardano-haskell-packages \).*$/\1$CHAP_DATE/" cabal.project
diff --git a/cabal.project b/cabal.project
index 1c9fdc4..e15e012 100644
--- a/cabal.project
+++ b/cabal.project
@@ -11,9 +11,9 @@ repository cardano-haskell-packages
 
 index-state:
   -- Bump both the following dates if you need newer packages from Hackage
-  , hackage.haskell.org 2026-05-22T05:43:37Z
+  , hackage.haskell.org 2026-07-14T11:13:58Z
   -- Bump this if you need newer packages from CHaP
-  , cardano-haskell-packages 2026-05-22T05:43:37Z
+  , cardano-haskell-packages 2026-07-13T07:20:00Z
 
 packages:
   ./.
diff --git a/flake.lock b/flake.lock
index 52293fb..7886a13 100644
--- a/flake.lock
+++ b/flake.lock
@@ -3,11 +3,11 @@
     "CHaP": {
       "flake": false,
       "locked": {
-        "lastModified": 1779431600,
-        "narHash": "sha256-BveisGfAV1GBrwP83S5w0D7B1t3VPaoHGGlRcnHYN5E=",
+        "lastModified": 1784036502,
+        "narHash": "sha256-v2gJiWwdtng995xg/69wlElHqzUKii8g/6XJDeUNH30=",
         "owner": "IntersectMBO",
         "repo": "cardano-haskell-packages",
-        "rev": "8479db771a3186eb326e42d8480eddc20a208275",
+        "rev": "c03bfca79b27fab5e4cd64bf7c34eab8055e8bfa",
         "type": "github"
       },
       "original": {
@@ -209,11 +209,11 @@
     "hackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1779435264,
-        "narHash": "sha256-lGelUDkM0BTFTV2+spI6yxSlOqcqOl+o+PLJk6mfiAo=",
+        "lastModified": 1784034838,
+        "narHash": "sha256-wJ+usE5HAwQwlSGICfq9wqVW5+nhbKdGs334y/+pdBI=",
         "owner": "input-output-hk",
         "repo": "hackage.nix",
-        "rev": "7e9747c96955a761fbcc62b2e313d7593da8ce42",
+        "rev": "cf7d693298b545ee537a97524b3bdd95636658c2",
         "type": "github"
       },
       "original": {
diff --git a/plinth-template.cabal b/plinth-template.cabal
index cbb8a25..fed74ab 100644
--- a/plinth-template.cabal
+++ b/plinth-template.cabal
@@ -49,10 +49,10 @@ common plinth-options
 
 common plutus-deps
   build-depends:
-    , plutus-core ^>=1.65.0.0
-    , plutus-ledger-api ^>=1.65.0.0
-    , plutus-tx ^>=1.65.0.0
-    , plutus-tx-plugin ^>=1.65.0.0
+    , plutus-core ^>=1.66.0.0
+    , plutus-ledger-api ^>=1.66.0.0
+    , plutus-tx ^>=1.66.0.0
+    , plutus-tx-plugin ^>=1.66.0.0
 
 library plinth-validators
   import:          plinth-options, plutus-deps