diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.2.0.1] - 2025-12-18
+
+### Changed
+
+* Fixed that the caching mechanism was completely broken: it would never
+  refresh the samples, ever.
+
 ## [0.2.0.0] - 2025-12-17
 
 ### Added
diff --git a/prometheus-wai.cabal b/prometheus-wai.cabal
--- a/prometheus-wai.cabal
+++ b/prometheus-wai.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           prometheus-wai
-version:        0.2.0.0
+version:        0.2.0.1
 description:    Prometheus metrics for WAI applications
 homepage:       https://github.com/NorfairKing/prometheus-wai#readme
 bug-reports:    https://github.com/NorfairKing/prometheus-wai/issues
diff --git a/src/System/Metrics/Prometheus/Wai/Middleware.hs b/src/System/Metrics/Prometheus/Wai/Middleware.hs
--- a/src/System/Metrics/Prometheus/Wai/Middleware.hs
+++ b/src/System/Metrics/Prometheus/Wai/Middleware.hs
@@ -167,15 +167,14 @@
         sampleWithCache = case mCache of
           Nothing -> metricsEndpointSample
           Just (cacheDurationNanos, var) -> do
-            modifyMVar var $ \lastTup@(lastSampleTime, lastSample) -> do
-              now <- getMonotonicTimeNSec
+            now <- getMonotonicTimeNSec
+            modifyMVar var $ \lastTup@(lastSampleTime, lastSample) ->
               if now - lastSampleTime < cacheDurationNanos
                 then pure (lastTup, lastSample)
                 else do
-                  newSample <- metricsEndpointSample
-                  let combinedSample = combineRegistrySample lastSample newSample
-                  let newTup = (now, combinedSample)
-                  pure (newTup, combinedSample)
+                  freshSample <- metricsEndpointSample
+                  let freshTup = (now, freshSample)
+                  pure (freshTup, freshSample)
 
     pure $ \application request sendResponse ->
       if Request.rawPathInfo request == metricsEndpointPath