diff --git a/Orthanc-1.9.0.tar.gz b/Orthanc-1.9.0.tar.gz
deleted file mode 100644
index c320b1d..0000000
--- a/Orthanc-1.9.0.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:38075308cf3ed5a6a73c80fe2f1a87449220d631564c22824b1fc6400fd0a8c3
-size 1773202
diff --git a/Orthanc-1.9.1.tar.gz b/Orthanc-1.9.1.tar.gz
new file mode 100644
index 0000000..59c49da
--- /dev/null
+++ b/Orthanc-1.9.1.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:943008ad26cee36db09276d1b54879b536542531411612de5c2320ba18025262
+size 1786754
diff --git a/orthanc.changes b/orthanc.changes
index 8a9537a..53842ca 100644
--- a/orthanc.changes
+++ b/orthanc.changes
@@ -1,3 +1,33 @@
+-------------------------------------------------------------------
+Thu Feb 25 20:31:58 UTC 2021 - Axel Braun <axel.braun@gmx.de>
+
+- version 1.9.1
+* The "dicom-as-json" attachments are not explicitly stored anymore to improve performance
+* If the storage area doesn't support range reading, or if "StorageCompression"
+  is enabled, a new type of attachment "dicom-until-pixel-data" is generated
+* New metadata automatically computed at the instance level: "PixelDataOffset"
+* New configuration option related to networking:
+  - "Timeout" in "DicomModalities" to set DICOM SCU timeout on a per-modality basis
+  - "Timeout" in "OrthancPeers" to set HTTP client timeout on a per-peer basis
+* API version upgraded to 11
+* BREAKING CHANGES:
+  - External applications should not call "/instances/.../attachments/dicom-as-json" anymore,
+    and should use "/instances/.../tags" instead
+  - "/instances/.../tags" route does not report the tags after "Pixel Data" (7fe0,0010) anymore
+* "/peers/{id}/store-straight": Synchronously send the DICOM instance in POST body to the peer
+* New arguments in the REST API:
+  - "Timeout" in "/modalities/.../query"
+  - "Timeout" in "/modalities/.../storage-commitment"
+  - "Timeout" in "/queries/.../answers/.../query-{studies|series|instances}"
+* New value in enumeration: OrthancPluginDicomToJsonFlags_StopAfterPixelData
+* New value in enumeration: OrthancPluginDicomToJsonFlags_SkipGroupLengths
+* Improved precision of floating-point numbers in DICOM-as-JSON and DICOM summary
+* Optimization in C-STORE SCP by avoiding an unnecessary DICOM parsing
+* Fix build on big-endian architectures
+* Handle public tags with "UN" value representation and containing a string (cf. DICOM CP 246)
+* The numbering of sequences in Orthanc Explorer now uses the DICOM convention (starts at 1)
+* Possibility to generate a static library containing the Orthanc Framework
+
 -------------------------------------------------------------------
 Fri Jan 29 16:58:24 UTC 2021 - Axel Braun <axel.braun@gmx.de>
 
diff --git a/orthanc.spec b/orthanc.spec
index 54aabd7..2f81b91 100644
--- a/orthanc.spec
+++ b/orthanc.spec
@@ -18,7 +18,7 @@
 
 
 Name:           orthanc
-Version:        1.9.0
+Version:        1.9.1
 Release:        0
 Summary:        RESTful DICOM server for healthcare and medical research
 License:        GPL-3.0-or-later