diff --git a/pkgs/games/empty-epsilon/0001-bundle-system-glm-in-seriousproton.patch b/pkgs/games/empty-epsilon/0001-bundle-system-glm-in-seriousproton.patch
new file mode 100644
index 000000000000..d59d548a4a46
--- /dev/null
+++ b/pkgs/games/empty-epsilon/0001-bundle-system-glm-in-seriousproton.patch
@@ -0,0 +1,34 @@
+From 9718cdb4bdaf7203d07789b2dc5eec4060538889 Mon Sep 17 00:00:00 2001
+From: Maximilian Bosch <maximilian@mbosch.me>
+Date: Fri, 9 Jul 2021 11:37:22 +0200
+Subject: [PATCH] bundle system-glm in seriousproton
+
+---
+ CMakeLists.txt | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index cbd68ca..730df82 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -81,6 +81,9 @@ if(NOT ${SFML_FOUND})
+     )
+ endif()
+ 
++
++find_package(glm)
++
+ add_subdirectory(src/Box2D)
+ add_subdirectory(src/lua)
+ add_subdirectory(src/GL)
+@@ -205,7 +208,7 @@ target_compile_options(seriousproton_deps
+ 
+ target_link_libraries(seriousproton_deps
+     INTERFACE 
+-        box2d lua glew ${SFML_LIBRARIES}
++        box2d lua glew ${SFML_LIBRARIES} glm
+         "$<$<BOOL:${WIN32}>:wsock32>"
+         # LTO flag must be on the linker's list as well.
+         "$<$<AND:$<BOOL:${CMAKE_COMPILER_IS_GNUCC}>,$<OR:$<CONFIG:RelWithDebInfo>,$<CONFIG:Release>>>:-flto>"
+-- 
+2.31.1
diff --git a/pkgs/games/empty-epsilon/default.nix b/pkgs/games/empty-epsilon/default.nix
index d444c50d976d..bee806fcdd5b 100644
--- a/pkgs/games/empty-epsilon/default.nix
+++ b/pkgs/games/empty-epsilon/default.nix
@@ -1,11 +1,11 @@
-{ lib, stdenv, fetchFromGitHub, cmake, sfml, libX11, glew, python3 }:
+{ lib, stdenv, fetchFromGitHub, cmake, sfml, libX11, glew, python3, fetchpatch, applyPatches, glm}:
 
 let
 
   major = "2021";
-  minor = "03";
-  patch.seriousproton = "30";
-  patch.emptyepsilon = "31";
+  minor = "06";
+  patch.seriousproton = "23";
+  patch.emptyepsilon = "23";
 
   version.seriousproton = "${major}.${minor}.${patch.seriousproton}";
   version.emptyepsilon = "${major}.${minor}.${patch.emptyepsilon}";
@@ -14,15 +14,32 @@ let
     pname = "serious-proton";
     version = version.seriousproton;
 
-    src = fetchFromGitHub {
-      owner = "daid";
-      repo = "SeriousProton";
-      rev = "EE-${version.seriousproton}";
-      sha256 = "sha256-wxb/CxJ/HKsVngeahjygZFPMMxitkHdVD0EQ3svxgIU=";
+    src = applyPatches {
+      src = fetchFromGitHub {
+        owner = "daid";
+        repo = "SeriousProton";
+        rev = "EE-${version.seriousproton}";
+        sha256 = "sha256-02cHHWKoe99257qLgxtMjeXnhi0UYajh4v87B57felM=";
+      };
+
+      patches = [
+        # Various CMake fixes for `json11`. Can be removed on the next release.
+        (fetchpatch {
+          url = "https://github.com/daid/SeriousProton/commit/adbba45fd9ae5e020e43e5d7f9326f1355391209.patch";
+          sha256 = "sha256-gMTpIGPGCREmZ/ZxvEc7RVsVUxWXbu2BPUCE3A62sCI=";
+        })
+
+        # Simplified variant of
+        # * https://github.com/daid/SeriousProton/commit/0d1ac45b738195db5e2785531db713328f547e60
+        # * https://github.com/daid/SeriousProton/commit/32509f2db91a58b9528aeb1bb505e9426b52b825
+        #
+        # To fix configure errors when building EmptyEpsilon, can be removed on the next release.
+        ./0001-bundle-system-glm-in-seriousproton.patch
+      ];
     };
 
     nativeBuildInputs = [ cmake ];
-    buildInputs = [ sfml libX11 ];
+    buildInputs = [ sfml libX11 glm ];
 
     meta = with lib; {
       description = "C++ game engine coded on top of SFML used for EmptyEpsilon";
@@ -44,11 +61,23 @@ stdenv.mkDerivation {
     owner = "daid";
     repo = "EmptyEpsilon";
     rev = "EE-${version.emptyepsilon}";
-    sha256 = "sha256-x0XJPMU0prubTb4ti/W/dH5P9abNwbjqkeUhKQpct9o=";
+    sha256 = "sha256-dc/Ic1/DULTQO6y9xSop2HxFvUh4kN57oSF/HBmbmF4=";
   };
 
+  patches = [
+    # Various CMake fixes that can be removed when upgrading to the next release.
+    (fetchpatch {
+      url = "https://github.com/daid/EmptyEpsilon/commit/ee0cd42bfe5fd20b8339e8e02eb7f69766168d57.patch";
+      sha256 = "sha256-8dXtl/izfzqbwHtjuugjH34vYP+d4AobqZhxL2GXTzw=";
+    })
+    (fetchpatch {
+      url = "https://github.com/daid/EmptyEpsilon/commit/69d93e6acdae3259755924f9d35e7e5ae949d377.patch";
+      sha256 = "sha256-30AGo4mi73GrW9GNS3vF3mTOS7J5/41LvjOzNjeFhOg=";
+    })
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ serious-proton sfml glew libX11 python3 ];
+  buildInputs = [ serious-proton sfml glew libX11 python3 glm ];
 
   cmakeFlags = [
     "-DSERIOUS_PROTON_DIR=${serious-proton.src}"