diff --git a/Utilities/Release/sunos/docker/Dockerfile b/Utilities/Release/sunos/docker/Dockerfile
index 626dff4072..1c300b30ee 100644
--- a/Utilities/Release/sunos/docker/Dockerfile
+++ b/Utilities/Release/sunos/docker/Dockerfile
@@ -14,7 +14,7 @@ RUN --mount=type=tmpfs,target=/var/log \
  && apt-get --download-only -y install $(grep -h '^[^#]\+$' /root/*.lst)
 
 FROM ${BASE_IMAGE} AS base
-ARG ARCH=sparc
+ARG ARCH=sparc64
 RUN --mount=type=bind,source=base.lst,target=/root/base.lst \
     --mount=type=bind,source=docker-clean,target=/etc/apt/apt.conf.d/docker-clean \
     --mount=type=cache,from=apt-cache,source=/var/lib/apt/lists,target=/var/lib/apt/lists \
diff --git a/Utilities/Release/sunos/docker/base.bash b/Utilities/Release/sunos/docker/base.bash
index 0c707d014a..ddc6d47c51 100755
--- a/Utilities/Release/sunos/docker/base.bash
+++ b/Utilities/Release/sunos/docker/base.bash
@@ -6,13 +6,13 @@ arch="$1"
 readonly arch
 
 case "$arch" in
-    i386)
-        tarball="gcc-9.5.0-linux-x86_64-cross-sunos-i386.tar.xz"
-        sha256sum="3cd3c989483051e741dd9f39170842d22e5c43cd25628d2b0c57890a3f235883"
+    x86_64)
+        tarball="gcc-9.5.0-linux-x86_64-cross-sunos-x86_64.tar.xz"
+        sha256sum="0632342dc20445a798148548376f986f3a09dc2e4f433fa9100e4a5371a14860"
         ;;
-    sparc)
-        tarball="gcc-9.5.0-linux-x86_64-cross-sunos-sparc.tar.xz"
-        sha256sum="853454ef4e787895786fdb21e56a3ba9c121ffe6116467a75f2c3eb09f3c88b4"
+    sparc64)
+        tarball="gcc-9.5.0-linux-x86_64-cross-sunos-sparc64.tar.xz"
+        sha256sum="ea3c3deecdd94823edd7241aa4b79a0dc4e7fb5a8dc9d101cc2d6a72beab7ced"
         ;;
     *)
         echo >&2 "Unknown architecture: $arch"
@@ -24,7 +24,7 @@ readonly sha256sum
 
 cd /tmp
 
-curl -OL "https://gitlab.kitware.com/api/v4/projects/6955/packages/generic/gcc-solaris/v9.5.0-20250212.0/$tarball"
+curl -OL "https://gitlab.kitware.com/api/v4/projects/6955/packages/generic/gcc-solaris/v9.5.0-20250227.0/$tarball"
 echo "$sha256sum  $tarball" > gcc.sha256sum
 sha256sum --check gcc.sha256sum
 
diff --git a/Utilities/Release/sunos/docker/openssl.bash b/Utilities/Release/sunos/docker/openssl.bash
index 86f9ad80c4..ea3b6b47c0 100755
--- a/Utilities/Release/sunos/docker/openssl.bash
+++ b/Utilities/Release/sunos/docker/openssl.bash
@@ -6,15 +6,15 @@ arch="$1"
 readonly arch
 
 case "$arch" in
-    i386)
-        target=i386-pc-solaris2.10
-        openssl_target=solaris-x86-gcc
+    x86_64)
+        target=x86_64-pc-solaris2.10
+        openssl_target=solaris64-x86_64-gcc
         ldlibs=
         ;;
-    sparc)
-        target=sparc-sun-solaris2.10
-        openssl_target=solaris-sparcv8-gcc
-        ldlibs=-latomic
+    sparc64)
+        target=sparc64-sun-solaris2.10
+        openssl_target=solaris64-sparcv9-gcc
+        ldlibs=
         ;;
     *)
         echo >&2 "Unknown architecture: $arch"
@@ -59,4 +59,4 @@ if ! make install_sw >>make.log 2>&1; then
     exit 1
 fi
 
-tar czf /root/openssl.tar.gz -C / "$prefix"
+tar czf /root/openssl.tar.gz -C / "${prefix#/}"
diff --git a/Utilities/Release/sunos/docker/sysroot.bash b/Utilities/Release/sunos/docker/sysroot.bash
index 87ec01e119..a556f1c9ff 100755
--- a/Utilities/Release/sunos/docker/sysroot.bash
+++ b/Utilities/Release/sunos/docker/sysroot.bash
@@ -6,13 +6,13 @@ arch="$1"
 readonly arch
 
 case "$arch" in
-    i386)
-        tarball="sysroot-i386-pc-solaris2.10-sunos5.10-1.tar.xz"
-        sha256sum="1b9251699f4e412ba5b0fde9c0fb96ceef6b8a1f47f0c1f2146ba0ba9da458b8"
+    x86_64)
+        tarball="sysroot-x86_64-pc-solaris2.10-sunos5.10-1.tar.xz"
+        sha256sum="bea632b3ae755f89a1c0e64775437a9b29001a3fc3a3c2c6247b921776059231"
         ;;
-    sparc)
-        tarball="sysroot-sparc-sun-solaris2.10-sunos5.10-1.tar.xz"
-        sha256sum="e6c668a63dc00de443d07cbe2be779335642ffe1b818ba85d23ab543982aaf23"
+    sparc64)
+        tarball="sysroot-sparc64-sun-solaris2.10-sunos5.10-1.tar.xz"
+        sha256sum="fd60cc1be951ae314ff2b4246ac055c8e5b21c39b4cd41b23ebcec709451d90f"
         ;;
     *)
         echo >&2 "Unknown architecture: $arch"
@@ -23,8 +23,8 @@ esac
 #   --build-arg SYSROOT_URL=...
 #   --build-arg SYSROOT_SHA256SUM=...
 # The tarball must contain one of:
-#   sysroot/i386-pc-solaris2.10/{lib,usr/lib,usr/include}
-#   sysroot/sparc-sun-solaris2.10/{lib,usr/lib,usr/include}
+#   sysroot/x86_64-pc-solaris2.10/{lib,usr/lib,usr/include}
+#   sysroot/sparc64-sun-solaris2.10/{lib,usr/lib,usr/include}
 # The content may be retrieved from a real Solaris host.
 if test -n "$SYSROOT_URL"; then
     url="$SYSROOT_URL"
diff --git a/Utilities/Release/sunos/i386/toolchain.cmake b/Utilities/Release/sunos/i386/toolchain.cmake
deleted file mode 100644
index 59ce6b5a78..0000000000
--- a/Utilities/Release/sunos/i386/toolchain.cmake
+++ /dev/null
@@ -1,6 +0,0 @@
-set(CMAKE_SYSTEM_NAME SunOS)
-set(CMAKE_SYSTEM_VERSION 5.10)
-set(CMAKE_SYSTEM_PROCESSOR i386)
-set(CMAKE_SYSROOT /opt/cross/sysroot/i386-pc-solaris2.10)
-set(CMAKE_C_COMPILER /opt/cross/bin/i386-pc-solaris2.10-gcc)
-set(CMAKE_CXX_COMPILER /opt/cross/bin/i386-pc-solaris2.10-g++)
diff --git a/Utilities/Release/sunos/sparc/toolchain.cmake b/Utilities/Release/sunos/sparc/toolchain.cmake
deleted file mode 100644
index 789df8db09..0000000000
--- a/Utilities/Release/sunos/sparc/toolchain.cmake
+++ /dev/null
@@ -1,6 +0,0 @@
-set(CMAKE_SYSTEM_NAME SunOS)
-set(CMAKE_SYSTEM_VERSION 5.10)
-set(CMAKE_SYSTEM_PROCESSOR sparc)
-set(CMAKE_SYSROOT /opt/cross/sysroot/sparc-sun-solaris2.10)
-set(CMAKE_C_COMPILER /opt/cross/bin/sparc-sun-solaris2.10-gcc)
-set(CMAKE_CXX_COMPILER /opt/cross/bin/sparc-sun-solaris2.10-g++)
diff --git a/Utilities/Release/sunos/sparc/cache.txt b/Utilities/Release/sunos/sparc64/cache.txt
similarity index 74%
rename from Utilities/Release/sunos/sparc/cache.txt
rename to Utilities/Release/sunos/sparc64/cache.txt
index eb12c14900..a904dac04c 100644
--- a/Utilities/Release/sunos/sparc/cache.txt
+++ b/Utilities/Release/sunos/sparc64/cache.txt
@@ -6,8 +6,7 @@ CMAKE_EXE_LINKER_FLAGS:STRING=-static-libstdc++ -static-libgcc -Wl,-z,noexecstac
 # Enable ssl support in curl
 CMAKE_USE_OPENSSL:BOOL=ON
 OPENSSL_USE_STATIC_LIBS:BOOL=ON
-OpenSSL_ROOT:PATH=/opt/cross/openssl/sparc-sun-solaris2.10
-_OPENSSL_STATIC_LIBRARIES:STRING=/opt/cross/sparc-sun-solaris2.10/lib/libatomic.a
+OpenSSL_ROOT:PATH=/opt/cross/openssl/sparc64-sun-solaris2.10
 
 # Enable ccmake
 BUILD_CursesDialog:BOOL=ON
@@ -23,4 +22,4 @@ CMake_TEST_INSTALL:BOOL=OFF
 CMAKE_SKIP_INSTALL_ALL_DEPENDENCY:BOOL=ON
 
 # CPack package file name component for this platform.
-CPACK_SYSTEM_NAME:STRING=sunos-sparc
+CPACK_SYSTEM_NAME:STRING=sunos-sparc64
diff --git a/Utilities/Release/sunos/sparc64/toolchain.cmake b/Utilities/Release/sunos/sparc64/toolchain.cmake
new file mode 100644
index 0000000000..94471fe01c
--- /dev/null
+++ b/Utilities/Release/sunos/sparc64/toolchain.cmake
@@ -0,0 +1,6 @@
+set(CMAKE_SYSTEM_NAME SunOS)
+set(CMAKE_SYSTEM_VERSION 5.10)
+set(CMAKE_SYSTEM_PROCESSOR sparc64)
+set(CMAKE_SYSROOT /opt/cross/sysroot/sparc64-sun-solaris2.10)
+set(CMAKE_C_COMPILER /opt/cross/bin/sparc64-sun-solaris2.10-gcc)
+set(CMAKE_CXX_COMPILER /opt/cross/bin/sparc64-sun-solaris2.10-g++)
diff --git a/Utilities/Release/sunos/i386/cache.txt b/Utilities/Release/sunos/x86_64/cache.txt
similarity index 84%
rename from Utilities/Release/sunos/i386/cache.txt
rename to Utilities/Release/sunos/x86_64/cache.txt
index 6bb2c27c17..33f9914d9f 100644
--- a/Utilities/Release/sunos/i386/cache.txt
+++ b/Utilities/Release/sunos/x86_64/cache.txt
@@ -6,7 +6,7 @@ CMAKE_EXE_LINKER_FLAGS:STRING=-static-libstdc++ -static-libgcc -Wl,-z,noexecstac
 # Enable ssl support in curl
 CMAKE_USE_OPENSSL:BOOL=ON
 OPENSSL_USE_STATIC_LIBS:BOOL=ON
-OpenSSL_ROOT:PATH=/opt/cross/openssl/i386-pc-solaris2.10
+OpenSSL_ROOT:PATH=/opt/cross/openssl/x86_64-pc-solaris2.10
 
 # Enable ccmake
 BUILD_CursesDialog:BOOL=ON
@@ -22,4 +22,4 @@ CMake_TEST_INSTALL:BOOL=OFF
 CMAKE_SKIP_INSTALL_ALL_DEPENDENCY:BOOL=ON
 
 # CPack package file name component for this platform.
-CPACK_SYSTEM_NAME:STRING=sunos-i386
+CPACK_SYSTEM_NAME:STRING=sunos-x86_64
diff --git a/Utilities/Release/sunos/x86_64/toolchain.cmake b/Utilities/Release/sunos/x86_64/toolchain.cmake
new file mode 100644
index 0000000000..0954291099
--- /dev/null
+++ b/Utilities/Release/sunos/x86_64/toolchain.cmake
@@ -0,0 +1,6 @@
+set(CMAKE_SYSTEM_NAME SunOS)
+set(CMAKE_SYSTEM_VERSION 5.10)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(CMAKE_SYSROOT /opt/cross/sysroot/x86_64-pc-solaris2.10)
+set(CMAKE_C_COMPILER /opt/cross/bin/x86_64-pc-solaris2.10-gcc)
+set(CMAKE_CXX_COMPILER /opt/cross/bin/x86_64-pc-solaris2.10-g++)