diff --git a/gnu/local.mk b/gnu/local.mk
index 9bad87710c..d84d2bee3d 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -994,8 +994,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/dbus-c++-gcc-compat.patch		\
   %D%/packages/patches/dbus-c++-threading-mutex.patch		\
   %D%/packages/patches/dbxfs-remove-sentry-sdk.patch		\
-  %D%/packages/patches/dealii-fix-compiliation-with-boost-1.78.patch	\
-  %D%/packages/patches/dealii-fix-sundials.patch		\
   %D%/packages/patches/debops-constants-for-external-program-names.patch \
   %D%/packages/patches/debops-debops-defaults-fall-back-to-less.patch \
   %D%/packages/patches/dee-vapi.patch			\
diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index c74f055a07..2d3e67a6b4 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -5171,16 +5171,14 @@ (define trilinos-for-dealii-openmpi
 (define-public dealii
   (package
     (name "dealii")
-    (version "9.3.2")
+    (version "9.3.3")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "https://github.com/dealii/dealii/releases/"
                            "download/v" version "/dealii-" version ".tar.gz"))
        (sha256
-        (base32 "1s0kawnljg24jj6nibwrif5gxdgg2daqfylhqqpl1lvmzmmxfhak"))
-       (patches (search-patches "dealii-fix-compiliation-with-boost-1.78.patch"
-                                "dealii-fix-sundials.patch"))
+        (base32 "0a8s4yxcbvzmfgv5qcg27h2ss4fcnyhrhhs35glqj59l9cbmkysx"))
        (modules '((guix build utils)))
        (snippet
         ;; Remove bundled boost, muparser, TBB and UMFPACK.
diff --git a/gnu/packages/patches/dealii-fix-compiliation-with-boost-1.78.patch b/gnu/packages/patches/dealii-fix-compiliation-with-boost-1.78.patch
deleted file mode 100644
index 1937aa9afc..0000000000
--- a/gnu/packages/patches/dealii-fix-compiliation-with-boost-1.78.patch
+++ /dev/null
@@ -1,40 +0,0 @@
-From cbef761731627cece2a6f0276b87dacabbdc8a72 Mon Sep 17 00:00:00 2001
-From: David Wells <drwells@email.unc.edu>
-Date: Tue, 4 Jan 2022 12:46:30 -0500
-Subject: [PATCH] Fix compilation with boost 1.78.
-
-I bisected (fortunately Boost.Geometry a header-only library so adding the
-include directory sufficed) and
-https://github.com/boostorg/geometry/commit/6eb9e238bcb37e26dc31d16acf826784a2ba30f4
-is where this problem starts for us. See also
-https://github.com/boostorg/geometry/issues/792 - the easiest fix for all such
-issues is to just include the project header `boost/geometry/geometry.hpp`.
-
-In this particular case, if you look at the commit which causes grid_tools.cc
-fails to compile, its because we were relying on some implicit includes. In
-particular, we need the distance header to find the distance between points and
-boxes, but that was previously included in another file.
-
-This patch has been adapted from
-e0e76835519d122fd12b5858e16d08641a641c6a to apply to dealii 9.3.2.
-
-See https://github.com/dealii/dealii/pull/13165.
----
- include/deal.II/numerics/rtree.h | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/include/deal.II/numerics/rtree.h b/include/deal.II/numerics/rtree.h
-index 1b9d04dacd..1e1bfd2932 100644
---- a/include/deal.II/numerics/rtree.h
-+++ b/include/deal.II/numerics/rtree.h
-@@ -26,6 +26,7 @@
- #include <deal.II/boost_adaptors/segment.h>
-
- DEAL_II_DISABLE_EXTRA_DIAGNOSTICS
-+#include <boost/geometry/algorithms/distance.hpp>
- #include <boost/geometry/index/rtree.hpp>
- #include <boost/geometry/strategies/strategies.hpp>
- DEAL_II_ENABLE_EXTRA_DIAGNOSTICS
---
-2.30.2
-
diff --git a/gnu/packages/patches/dealii-fix-sundials.patch b/gnu/packages/patches/dealii-fix-sundials.patch
deleted file mode 100644
index 7dd5df45da..0000000000
--- a/gnu/packages/patches/dealii-fix-sundials.patch
+++ /dev/null
@@ -1,60 +0,0 @@
-From af73f368f7f9d4a00df075d1a9f50fc495f8e87a Mon Sep 17 00:00:00 2001
-From: Timo Heister <timo.heister@gmail.com>
-Date: Sat, 25 Dec 2021 12:30:45 -0500
-Subject: [PATCH] fix sundials compilation
-
----
- include/deal.II/sundials/n_vector.templates.h | 11 ++++++-----
- 1 file changed, 6 insertions(+), 5 deletions(-)
-
-diff --git a/include/deal.II/sundials/n_vector.templates.h b/include/deal.II/sundials/n_vector.templates.h
-index 2b49e3efc9..746f63a03b 100644
---- a/include/deal.II/sundials/n_vector.templates.h
-+++ b/include/deal.II/sundials/n_vector.templates.h
-@@ -253,13 +253,13 @@ namespace SUNDIALS
-       template <
-         typename VectorType,
-         typename std::enable_if_t<!IsBlockVector<VectorType>::value, int> = 0>
--      MPI_Comm
-+      const MPI_Comm &
-       get_communicator(N_Vector v);
-
-       template <
-         typename VectorType,
-         typename std::enable_if_t<IsBlockVector<VectorType>::value, int> = 0>
--      MPI_Comm
-+      const MPI_Comm &
-       get_communicator(N_Vector v);
-
-       /**
-@@ -481,7 +481,7 @@ SUNDIALS::internal::NVectorOperations::destroy(N_Vector v)
-
- template <typename VectorType,
-           std::enable_if_t<IsBlockVector<VectorType>::value, int>>
--MPI_Comm
-+const MPI_Comm &
- SUNDIALS::internal::NVectorOperations::get_communicator(N_Vector v)
- {
-   return unwrap_nvector_const<VectorType>(v)->block(0).get_mpi_communicator();
-@@ -491,7 +491,7 @@ SUNDIALS::internal::NVectorOperations::get_communicator(N_Vector v)
-
- template <typename VectorType,
-           std::enable_if_t<!IsBlockVector<VectorType>::value, int>>
--MPI_Comm
-+const MPI_Comm &
- SUNDIALS::internal::NVectorOperations::get_communicator(N_Vector v)
- {
-   return unwrap_nvector_const<VectorType>(v)->get_mpi_communicator();
-@@ -519,7 +519,8 @@ SUNDIALS::internal::NVectorOperations::get_communicator_as_void_ptr(N_Vector v)
-   (void)v;
-   return nullptr;
- #  else
--  return get_communicator<VectorType>(v);
-+  // We need to cast away const here, as SUNDIALS demands a pure `void *`.
-+  return &(const_cast<MPI_Comm &>(get_communicator<VectorType>(v)));
- #  endif
- }
-
---
-2.30.2
-
