diff --git a/deal.II-toolchain/packages/opencascade.package b/deal.II-toolchain/packages/opencascade.package
index 061504a5..e0d00171 100644
--- a/deal.II-toolchain/packages/opencascade.package
+++ b/deal.II-toolchain/packages/opencascade.package
@@ -10,37 +10,28 @@ fi
 
 if [ ${CANDI_OPENCASCADE_LOAD_TARBALL} = ON ]; then
     # download release tarball
-    VERSION=0.18.3
-    CHECKSUM=c553d6a7bf52f790abc3b6bb7a1e91a65947e92a426bb1a88a11960c31f0966c
-    CHECKSUM="${CHECKSUM} 452c8e26a469e8b0ba6cdd800848a0b406648b1b"
-    CHECKSUM="${CHECKSUM} 1686393c8493bbbb2f3f242330b33cba"
+    VERSION=7_7_1
+    CHECKSUM=e2a211e6e89c685802581ecfbda5ee94
 
     # VERSION=0.18.2
     # CHECKSUM=6dfd68e459e2c62387579888a867281f
 
-    # VERSION=0.18.1
-    # CHECKSUM=2a7597f4243ee1f03245aeeb02d00956
-
-    # VERSION=0.17
-    # CHECKSUM=f1a89395c4b0d199bea3db62b85f818d
-
-    NAME=OCE-${VERSION}
-    SOURCE=https://github.com/tpaviot/oce/archive/
-    EXTRACTSTO=oce-OCE-${VERSION}
+    NAME=V${VERSION}
+    SOURCE=https://github.com/Open-Cascade-SAS/OCCT/archive/refs/tags/
+    EXTRACTSTO=OCCT-${VERSION}
     PACKING=.tar.gz
 else
     # download git repository (huge download)
 
     # checkout specific release version
-    VERSION=master
-    #VERSION=OCE-0.18.3
-    #VERSION=OCE-0.18.2
+    #VERSION=master
+    VERSION=V7_7_1
 
     # set up git repository
-    NAME=oce.git
+    NAME=OCCT.git
     PACKING=git
-    EXTRACTSTO=OCE-${VERSION}
-    SOURCE=https://github.com/tpaviot/
+    EXTRACTSTO=opencascade-OCCT-${VERSION}
+    SOURCE=https://github.com/Open-Cascade-SAS/
 fi
 unset CANDI_OPENCASCADE_LOAD_TARBALL
 
@@ -49,27 +40,20 @@ BUILDCHAIN=cmake
 BUILDDIR=${BUILD_PATH}/${EXTRACTSTO}
 INSTALL_PATH=${INSTALL_PATH}/${EXTRACTSTO}
 
-CONFOPTS="\
-  -D OCE_INSTALL_PREFIX=${INSTALL_PATH} \
-  -D OCE_VISUALISATION:BOOL=OFF \
-  -D OCE_DISABLE_TKSERVICE_FONT:BOOL=ON \
-  -D OCE_DATAEXCHANGE:BOOL=ON \
-  -D OCE_OCAF:BOOL=OFF \
-  -D OCE_DISABLE_X11:BOOL=ON"
-
-package_specific_patch () {
-    cd ${UNPACK_PATH}/${EXTRACTSTO}
-    cecho ${WARN} "applying patch for missing xlocale.h for glibc v2.26 and above"
-    patch -p0 --forward < ${ORIG_DIR}/${PROJECT}/patches/oce-xlocale.patch || true
-    cecho ${WARN} "applying patch for isfinite"
-    patch -p0 --forward < ${ORIG_DIR}/${PROJECT}/patches/oce-isfinite.patch
-}
-
 package_specific_register () {
     export OPENCASCADE_DIR=${INSTALL_PATH}
     export CASROOT=${INSTALL_PATH}
 }
 
+CONFOPTS="\
+  -D USE_TK=OFF \
+  -D USE_FREETYPE=OFF \
+  -D USE_XLIB=OFF \
+  -D USE_VTK=OFF \
+  -D USE_OPENGL=OFF \
+  -D USE_GLES2=OFF \
+  -D BUILD_MODULE_Draw=OFF"
+
 package_specific_conf () {
     # Generate configuration file
     CONFIG_FILE=${CONFIGURATION_PATH}/${NAME}
diff --git a/deal.II-toolchain/patches/oce-isfinite.patch b/deal.II-toolchain/patches/oce-isfinite.patch
deleted file mode 100644
index 1811187d..00000000
--- a/deal.II-toolchain/patches/oce-isfinite.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- src/OSD/OSD.cxx     2022-02-11 14:34:21.726133403 -0500
-+++ src.patched/OSD/OSD.cxx     2022-02-11 14:33:27.025817808 -0500
-@@ -18,7 +18,7 @@
- #include <math.h>
- #ifdef WNT
- # define finite _finite
--#elif defined(isfinite)
-+#else
- # define finite isfinite
- #endif
-
diff --git a/deal.II-toolchain/patches/oce-xlocale.patch b/deal.II-toolchain/patches/oce-xlocale.patch
deleted file mode 100644
index fc63531b..00000000
--- a/deal.II-toolchain/patches/oce-xlocale.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff -u -r -N src.patched/Standard/Standard_CLocaleSentry.hxx src/Standard/Standard_CLocaleSentry.hxx
---- src.patched/Standard/Standard_CLocaleSentry.hxx	2017-08-11 07:51:11.000000000 +0200
-+++ src/Standard/Standard_CLocaleSentry.hxx	2017-10-23 10:53:43.571058000 +0200
-@@ -29,9 +29,11 @@
-     #define HAVE_XLOCALE_H
-   #endif
- 
--  //! We check _GNU_SOURCE for glibc extensions here and it is always defined by g++ compiler.
-+  //! We check _GNU_SOURCE for glibc <= v2.25 extensions here and it is always defined by g++ compiler.
-   #if defined(_GNU_SOURCE) && !defined(__ANDROID__)
--    #define HAVE_XLOCALE_H
-+    #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ <= 25
-+      #define HAVE_XLOCALE_H
-+    #endif
-   #endif
- #endif // ifndef HAVE_LOCALE_H
- 
diff --git a/deal.II-toolchain/platforms/supported/debian.platform b/deal.II-toolchain/platforms/supported/debian.platform
index a5f9ccfd..99be8087 100644
--- a/deal.II-toolchain/platforms/supported/debian.platform
+++ b/deal.II-toolchain/platforms/supported/debian.platform
@@ -7,6 +7,7 @@
 #   openmpi-bin openmpi-common libopenmpi-dev cmake subversion git \
 #   libblas-dev liblapack-dev libblas3 liblapack3 splint tcl tcl-dev \
 #   environment-modules libsuitesparse-dev libtool libboost-all-dev \
+#   libgl1-mesa-dev libegl1-mesa-dev \
 #   qt4-dev-tools libgmp-dev
 #
 # Then reboot and run candi again.
diff --git a/deal.II-toolchain/platforms/supported/ubuntu.platform b/deal.II-toolchain/platforms/supported/ubuntu.platform
index a8c3f783..f5da5ba5 100644
--- a/deal.II-toolchain/platforms/supported/ubuntu.platform
+++ b/deal.II-toolchain/platforms/supported/ubuntu.platform
@@ -7,6 +7,7 @@
 #   build-essential autoconf automake cmake libtool gfortran python3 \
 #   libboost-all-dev zlib1g-dev \
 #   openmpi-bin openmpi-common libopenmpi-dev \
+#   libgl1-mesa-dev libegl1-mesa-dev \
 #   libblas3 libblas-dev liblapack3 liblapack-dev libsuitesparse-dev
 #
 # Then run candi again.