diff --git a/pkgs/applications/science/biology/dcm2niix/default.nix b/pkgs/applications/science/biology/dcm2niix/default.nix
index cbde1647db9b..605ecaadf648 100644
--- a/pkgs/applications/science/biology/dcm2niix/default.nix
+++ b/pkgs/applications/science/biology/dcm2niix/default.nix
@@ -15,21 +15,21 @@ let
   cloudflareZlib = fetchFromGitHub {
     owner = "ningfei";
     repo = "zlib";
-    # HEAD revision of the gcc.amd64 branch on 2022-04-14. Reminder to update
+    # HEAD revision of the gcc.amd64 branch on 2023-03-28. Reminder to update
     # whenever bumping package version.
-    rev = "fda61188d1d4dcd21545c34c2a2f5cc9b0f5db4b";
-    sha256 = "sha256-qySFwY0VI2BQLO2XoCZeYshXEDnHh6SmJ3MvcBUROWU=";
+    rev = "f49b13c3380cf9677ae9a93641ebc6f770899def";
+    sha256 = "sha256-8HNFUGx2uuEb8UrGUiqkN+uVDX83YIisT2uO1Z7GCxc=";
   };
 in
 stdenv.mkDerivation rec {
-  version = "1.0.20211006";
+  version = "1.0.20230411";
   pname = "dcm2niix";
 
   src = fetchFromGitHub {
     owner = "rordenlab";
     repo = "dcm2niix";
     rev = "v${version}";
-    sha256 = "sha256-fQAVOzynMdSLDfhcYWcaXkFW/mnv4zySGLVJNE7ql/c=";
+    sha256 = "sha256-kOVEoqrk4l6sH8iDVx1QmOYP5tCufxsWnCnn9BibZ08=";
   };
 
   patches = lib.optionals withCloudflareZlib [
diff --git a/pkgs/applications/science/biology/dcm2niix/dont-fetch-external-libs.patch b/pkgs/applications/science/biology/dcm2niix/dont-fetch-external-libs.patch
index 493f0fb11f46..a8f97b434fc7 100644
--- a/pkgs/applications/science/biology/dcm2niix/dont-fetch-external-libs.patch
+++ b/pkgs/applications/science/biology/dcm2niix/dont-fetch-external-libs.patch
@@ -6,7 +6,7 @@ index 9f064eb..fe74df5 100644
 -set(CLOUDFLARE_BRANCH gcc.amd64) # Cloudflare zlib branch
 -
  ExternalProject_Add(zlib
--    GIT_REPOSITORY "${git_protocol}://github.com/ningfei/zlib.git"
+-    GIT_REPOSITORY "https://github.com/ningfei/zlib.git"
 -    GIT_TAG "${CLOUDFLARE_BRANCH}"
 +    URL file://@cloudflareZlib@
      SOURCE_DIR cloudflare-zlib
@@ -16,21 +16,10 @@ diff --git a/SuperBuild/SuperBuild.cmake b/SuperBuild/SuperBuild.cmake
 index 2a0a956..81354a7 100644
 --- a/SuperBuild/SuperBuild.cmake
 +++ b/SuperBuild/SuperBuild.cmake
-@@ -1,17 +1,3 @@
+@@ -1,6 +1,1 @@
 -# Check if git exists
 -find_package(Git)
 -if(NOT GIT_FOUND)
 -    message(FATAL_ERROR "Cannot find Git. Git is required for Superbuild")
 -endif()
--
--# Use git protocol or not
--option(USE_GIT_PROTOCOL "If behind a firewall turn this off to use http instead." ON)
--if(USE_GIT_PROTOCOL)
--    set(git_protocol "git")
--else()
--    set(git_protocol "https")
--endif()
--
- # Basic CMake build settings
- if(NOT CMAKE_BUILD_TYPE)
-     set(CMAKE_BUILD_TYPE "Release" CACHE STRING
+