diff --git a/.gitignore b/.gitignore
index ca18d85..5c2b918 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,5 @@
 /embree-3.12.2.tar.gz
 /embree-3.13.0.tar.gz
 /embree-3.13.2.tar.gz
+/embree-3.13.4.tar.gz
+/embree-3.13.3.tar.gz
diff --git a/embree.spec b/embree.spec
index b2e6d8e..5289a8d 100644
--- a/embree.spec
+++ b/embree.spec
@@ -5,14 +5,10 @@
 #%%global		prerelease	beta
 #%%global		commit		40b9aca2668f443cae6bfbfa7cc5a354f1087011
 #%%global		shortcommit	%%(c=%%{commit}; echo ${c:0:7})
-%ifarch x86_64 aarch64
-%bcond_without  ispc
-%else
-%bcond_with     ispc
-%endif
+%bcond_with	ispc
 
 Name:		embree
-Version:	3.13.2
+Version:	3.13.3
 Release:	%autorelease
 Summary:	Collection of high-performance ray tracing kernels
 
@@ -75,7 +71,7 @@ The %{name}-examples package contains sample binaries using %{name}.
 %endif
 
 %build
-export CXXFLAGS="%{optflags} -Wl,--as-needed"
+export CXXFLAGS="%{optflags}"
 %cmake \
 	-DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_CXX_STANDARD=17 \
@@ -88,11 +84,7 @@ export CXXFLAGS="%{optflags} -Wl,--as-needed"
 %else
         -DEMBREE_ISPC_SUPPORT=OFF \
 %endif
-%ifarch x86_64
-        -DEMBREE_MAX_ISA=SSE4.2 \
-%else
-        -DEMBREE_MAX_ISA=NONE \
-%endif
+        -DEMBREE_MAX_ISA=DEFAULT \
 	-DEMBREE_TUTORIALS=OFF 
 %cmake_build
 
diff --git a/sources b/sources
index dfc67b2..518ba74 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (embree-3.13.2.tar.gz) = 9e4912f52c503d8d1fe0c3c81bf8108f1af044bf08d76111e4c1ab434c6a38d33bae9aacfd60c874da76bcc2f909ad1f3f171d458adb7973644cdbfd3693dc0f
+SHA512 (embree-3.13.3.tar.gz) = eef8d9101f0bf95d6706a495a9aa628c10749862aeb2baa6bba2f82fcc3a96467a28ca1f522d672eb5aa7b29824363674feda25832724da361b3334334a218cd