diff --git a/PackageInfo.g b/PackageInfo.g
index 492f0e5..8466384 100644
--- a/PackageInfo.g
+++ b/PackageInfo.g
@@ -7,8 +7,8 @@ SetPackageInfo( rec(
 
 PackageName := "IO",
 Subtitle := "Bindings for low level C library I/O routines",
-Version := "4.9.0",
-Date := "05/09/2024", # dd/mm/yyyy format
+Version := "4.9.1",
+Date := "18/11/2024", # dd/mm/yyyy format
 License := "GPL-3.0-or-later",
 
 ##  Information about authors and maintainers.
@@ -104,7 +104,7 @@ AvailabilityTest := function()
     LogPackageLoadingMessage(PACKAGE_WARNING,
                               ["the kernel module is not compiled, ",
                                "the package cannot be loaded."]);
-    return fail;
+    return false;
   fi;
   return true;
 end,
diff --git a/_data/package.yml b/_data/package.yml
index 87072bc..9f61c60 100644
--- a/_data/package.yml
+++ b/_data/package.yml
@@ -1,7 +1,7 @@
 name: IO
-version: "4.9.0"
+version: "4.9.1"
 license: "GPL-3.0-or-later"
-date: 2024-09-05
+date: 2024-11-18
 description: |
     Bindings for low level C library I/O routines
 
@@ -21,9 +21,9 @@ packageinfo: https://gap-packages.github.io/io/PackageInfo.g
 
 downloads:
     - name: .tar.gz
-      url: https://github.com/gap-packages/io/releases/download/v4.9.0/io-4.9.0.tar.gz
+      url: https://github.com/gap-packages/io/releases/download/v4.9.1/io-4.9.1.tar.gz
     - name: .tar.bz2
-      url: https://github.com/gap-packages/io/releases/download/v4.9.0/io-4.9.0.tar.bz2
+      url: https://github.com/gap-packages/io/releases/download/v4.9.1/io-4.9.1.tar.bz2
 
 abstract: |
     The <span class="pkgname">IO</span> package, as its name suggests,    provides bindings for <span class="pkgname">GAP</span> to the lower    levels of Input/Output functionality in the C library.
@@ -37,7 +37,7 @@ citeas: |
     <p class='BibEntry'>
     [<span class='BibKey'>NH24</span>]   <b class='BibAuthor'>Neunhöffer, M. and Horn, M.</b>,
      <i class='BibTitle'>IO, Bindings for low level C library I/O routines,
-             Version 4.9.0</i>
+             Version 4.9.1</i>
      (<span class='BibYear'>2024</span>)<br />
     (<span class='BibNote'>GAP package</span>),
     <span class='BibHowpublished'><a href="https://gap-packages.github.io/io">https://gap-packages.github.io/io</a></span>.
@@ -48,8 +48,8 @@ bibtex: |
     @misc{ IO,
       author =           {Neunh{\"o}ffer, M. and Horn, M.},
       title =            {{IO},  Bindings  for low level C library I/O routines,
-                          {V}ersion 4.9.0},
-      month =            {Sep},
+                          {V}ersion 4.9.1},
+      month =            {Nov},
       year =             {2024},
       note =             {GAP package},
       howpublished =     {\href              {https://gap-packages.github.io/io}
diff --git a/doc/chap0.html b/doc/chap0.html
index 66dd74e..1937b76 100644
--- a/doc/chap0.html
+++ b/doc/chap0.html
@@ -29,10 +29,10 @@ <h1>IO</h1>
 <h2>Bindings for low level C library I/O routines</h2>
 
 <p>
-    4.9.0</p>
+    4.9.1</p>
 
 <p>
-    5 September 2024
+    18 November 2024
   </p>
 
 </div>
diff --git a/doc/chap0.txt b/doc/chap0.txt
index ded9ddb..217a236 100644
--- a/doc/chap0.txt
+++ b/doc/chap0.txt
@@ -6,10 +6,10 @@
                  Bindings for low level C library I/O routines 
   
   
-                                     4.9.0
+                                     4.9.1
   
   
-                                5 September 2024
+                                18 November 2024
   
   
                                  Max Neunhöffer
diff --git a/doc/chap0_mj.html b/doc/chap0_mj.html
index 52cd065..4f19c9f 100644
--- a/doc/chap0_mj.html
+++ b/doc/chap0_mj.html
@@ -32,10 +32,10 @@ <h1>IO</h1>
 <h2>Bindings for low level C library I/O routines</h2>
 
 <p>
-    4.9.0</p>
+    4.9.1</p>
 
 <p>
-    5 September 2024
+    18 November 2024
   </p>
 
 </div>