diff --git a/CHANGES.md b/CHANGES.md
index afa3058..551bb01 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Fixed
+- Fixed bug in `ImageServiceImpl` where `ImageInputStreams` were not properly closed after processing
+
 ## [5.1.12] - 2024-05-08
 ### Fixed
 - Updates ImageIO version to fix JPEG decoding from TIFFs with newer turbojpeg versions
diff --git a/src/main/java/de/digitalcollections/iiif/hymir/image/business/ImageServiceImpl.java b/src/main/java/de/digitalcollections/iiif/hymir/image/business/ImageServiceImpl.java
index 5f2b6d4..a53e0cb 100644
--- a/src/main/java/de/digitalcollections/iiif/hymir/image/business/ImageServiceImpl.java
+++ b/src/main/java/de/digitalcollections/iiif/hymir/image/business/ImageServiceImpl.java
@@ -224,6 +224,9 @@ public void readImageInfo(
     } finally {
       metrics.clearTimer(metricKey);
       if (r != null) {
+        if (r.getInput() instanceof ImageInputStream) {
+          ((ImageInputStream) r.getInput()).close();
+        }
         r.dispose();
       }
     }
@@ -343,6 +346,9 @@ private DecodedImage readImage(
     } finally {
       metrics.clearTimer(metricKey);
       if (reader != null) {
+        if (reader.getInput() instanceof ImageInputStream) {
+          ((ImageInputStream) reader.getInput()).close();
+        }
         reader.dispose();
       }
     }