diff --git a/CHANGES b/CHANGES
index ef5ba30..a174c5e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+Changes in 2.8.1 (April 5, 2024)
+- Fixed out-of-bound memory access issue for large inputs (libsais64).
+
 Changes in 2.8.0 (March 3, 2024)
 - Implemented permuted longest common prefix array (PLCP) construction of an integer array.
 - Fixed compilation error when compiling the library with OpenMP enabled.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d1ca4a9..377bae1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.10)
 
-project(libsais VERSION 2.8.0 LANGUAGES C DESCRIPTION "libsais is a library for linear time suffix array, longest common prefix array and burrows wheeler transform construction based on induced sorting algorithm.")
+project(libsais VERSION 2.8.1 LANGUAGES C DESCRIPTION "libsais is a library for linear time suffix array, longest common prefix array and burrows wheeler transform construction based on induced sorting algorithm.")
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED ON)
diff --git a/README.md b/README.md
index 850bbb4..132e99b 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ The libsais provides simple C99 API to construct suffix array and Burrows-Wheele
 The libsais is released under the [Apache License Version 2.0](LICENSE "Apache license")
 
 ## Changes
+* April 5, 2024 (2.8.1)
+  * Fixed out-of-bound memory access issue for large inputs (libsais64).
 * March 3, 2024 (2.8.0)
   * Implemented permuted longest common prefix array (PLCP) construction of an integer array.
   * Fixed compilation error when compiling the library with OpenMP enabled.
@@ -180,4 +182,4 @@ The libsais reuses space allocated for suffix array during construction. Sometim
 |            abac |      200000 |   0.002 sec (  84.36 MB/s) |   0.003 sec (  73.63 MB/s) | **+14.56%**|   0.002 sec ( 105.08 MB/s) |   0.002 sec (  86.64 MB/s) | **+21.27%**|
 |           test3 |     2097088 |   0.034 sec (  61.54 MB/s) |   0.037 sec (  56.45 MB/s) |  **+9.03%**|   0.028 sec (  75.76 MB/s) |   0.032 sec (  64.93 MB/s) | **+16.68%**|
 
-> * All other files from [Benchmarks](#benchmarks) above do not suffer from this fallbacks.
\ No newline at end of file
+> * All other files from [Benchmarks](#benchmarks) above do not suffer from this fallbacks.
diff --git a/VERSION b/VERSION
index 6533b66..dbe5900 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.8.0
\ No newline at end of file
+2.8.1
diff --git a/include/libsais.h b/include/libsais.h
index d05027c..58189ef 100644
--- a/include/libsais.h
+++ b/include/libsais.h
@@ -26,8 +26,8 @@ Please see the file LICENSE for full copyright information.
 
 #define LIBSAIS_VERSION_MAJOR   2
 #define LIBSAIS_VERSION_MINOR   8
-#define LIBSAIS_VERSION_PATCH   0
-#define LIBSAIS_VERSION_STRING  "2.8.0"
+#define LIBSAIS_VERSION_PATCH   1
+#define LIBSAIS_VERSION_STRING  "2.8.1"
 
 #ifdef _WIN32
     #ifdef LIBSAIS_SHARED
diff --git a/include/libsais16.h b/include/libsais16.h
index 0971da2..0791468 100644
--- a/include/libsais16.h
+++ b/include/libsais16.h
@@ -26,8 +26,8 @@ Please see the file LICENSE for full copyright information.
 
 #define LIBSAIS16_VERSION_MAJOR   2
 #define LIBSAIS16_VERSION_MINOR   8
-#define LIBSAIS16_VERSION_PATCH   0
-#define LIBSAIS16_VERSION_STRING  "2.8.0"
+#define LIBSAIS16_VERSION_PATCH   1
+#define LIBSAIS16_VERSION_STRING  "2.8.1"
 
 #ifdef _WIN32
     #ifdef LIBSAIS_SHARED
diff --git a/include/libsais64.h b/include/libsais64.h
index 1078eaa..8f3ac89 100644
--- a/include/libsais64.h
+++ b/include/libsais64.h
@@ -26,8 +26,8 @@ Please see the file LICENSE for full copyright information.
 
 #define LIBSAIS64_VERSION_MAJOR   2
 #define LIBSAIS64_VERSION_MINOR   8
-#define LIBSAIS64_VERSION_PATCH   0
-#define LIBSAIS64_VERSION_STRING  "2.8.0"
+#define LIBSAIS64_VERSION_PATCH   1
+#define LIBSAIS64_VERSION_STRING  "2.8.1"
 
 #ifdef _WIN32
     #ifdef LIBSAIS_SHARED
diff --git a/src/libsais64.c b/src/libsais64.c
index 9637ee3..0474478 100644
--- a/src/libsais64.c
+++ b/src/libsais64.c
@@ -6304,7 +6304,7 @@ static sa_sint_t libsais64_main_32s_recursion(sa_sint_t * RESTRICT T, sa_sint_t
         sa_sint_t new_fs = (fs + fs + n + n) <= INT32_MAX ? (fs + fs + n) : INT32_MAX - n;
         if ((new_fs / k >= 4) || (new_fs >= fs))
         {
-            libsais64_convert_inplace_64u_to_32u((uint32_t *)T, 0, n);
+            libsais64_convert_inplace_64u_to_32u((uint32_t *)(void *)T, 0, n);
 
 #if defined(LIBSAIS_OPENMP)
             sa_sint_t index = libsais_int_omp((int32_t *)T, (int32_t *)SA, (int32_t)n, (int32_t)k, (int32_t)new_fs, (int32_t)threads);