diff --git a/.ci/stack-lts-16.yaml b/.ci/stack-lts-16.yaml
index e2da4ba..83f9860 100644
--- a/.ci/stack-lts-16.yaml
+++ b/.ci/stack-lts-16.yaml
@@ -6,7 +6,7 @@ packages:
 - ../prometheus-proc
 - ../wai-middleware-prometheus
 extra-deps:
-- data-sketches-0.3.1.0
-- data-sketches-core-0.1.0.0
+- data-sketches-0.4.0.0
+- data-sketches-core-0.2.0.1
 - unix-memory-0.1.2
 resolver: lts-16.6
diff --git a/.ci/stack-lts-21.yaml b/.ci/stack-lts-21.yaml
index 6354a35..0ea1aa7 100644
--- a/.ci/stack-lts-21.yaml
+++ b/.ci/stack-lts-21.yaml
@@ -6,5 +6,7 @@ packages:
 - ../prometheus-proc
 - ../wai-middleware-prometheus
 extra-deps:
+- data-sketches-0.4.0.0
+- data-sketches-core-0.2.0.1
 - unix-memory-0.1.2
 resolver: lts-21.25
diff --git a/.ci/stack-lts-22.yaml b/.ci/stack-lts-22.yaml
index 18f3029..1a1c807 100644
--- a/.ci/stack-lts-22.yaml
+++ b/.ci/stack-lts-22.yaml
@@ -7,4 +7,6 @@ packages:
 - ../wai-middleware-prometheus
 extra-deps:
 - unix-memory-0.1.2
+- data-sketches-0.4.0.0
+- data-sketches-core-0.2.0.1
 resolver: lts-22.12
\ No newline at end of file
diff --git a/.ci/stack-nightly.yaml b/.ci/stack-nightly.yaml
index 90c60f9..9b0bfd2 100644
--- a/.ci/stack-nightly.yaml
+++ b/.ci/stack-nightly.yaml
@@ -7,4 +7,6 @@ packages:
 - ../wai-middleware-prometheus
 extra-deps:
 - unix-memory-0.1.2
-resolver: nightly-2024-03-01
\ No newline at end of file
+- data-sketches-0.4.0.0
+- data-sketches-core-0.2.0.1
+resolver: nightly-2026-04-01
\ No newline at end of file
diff --git a/prometheus-client/prometheus-client.cabal b/prometheus-client/prometheus-client.cabal
index 3f23321..b3a7819 100644
--- a/prometheus-client/prometheus-client.cabal
+++ b/prometheus-client/prometheus-client.cabal
@@ -49,7 +49,7 @@ library
     , utf8-string
     , exceptions
     , text
-    , data-sketches      < 0.4
+    , data-sketches      >= 0.4 && <0.5
   ghc-options: -Wall
 
 test-suite doctest
@@ -86,7 +86,7 @@ test-suite spec
     , exceptions
     , text
     , primitive
-    , data-sketches      < 0.4
+    , data-sketches      >= 0.4 && <0.5
   ghc-options: -Wall
 
 benchmark bench
diff --git a/prometheus-client/src/Prometheus/Metric/Summary.hs b/prometheus-client/src/Prometheus/Metric/Summary.hs
index dcc5b5d..15218c2 100644
--- a/prometheus-client/src/Prometheus/Metric/Summary.hs
+++ b/prometheus-client/src/Prometheus/Metric/Summary.hs
@@ -69,7 +69,8 @@ determineK (rank_, acceptableError) = go 6
 summary :: Info -> [Quantile] -> Metric Summary
 summary info quantiles_ = Metric $ do
     rs <- mkReqSketch kInt HighRanksAreAccurate
-    mv <- newMVar $ rs {criterion = (:<=)}
+    setCriterionLE rs
+    mv <- newMVar rs
     let summary_ = MkSummary mv quantiles_
     return (summary_, collectSummary info summary_)
     where
diff --git a/stack.yaml b/stack.yaml
index ec9efad..cf559b8 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -7,5 +7,6 @@ packages:
 - wai-middleware-prometheus
 extra-deps:
 - unix-memory-0.1.2
-- data-sketches-0.3.0.0
-resolver: lts-18.5
+- data-sketches-0.4.0.0
+- data-sketches-core-0.2.0.1
+resolver: lts-24.40