diff --git a/ports/arb/CONTROL b/ports/arb/CONTROL
index 540eedaee..750543298 100644
--- a/ports/arb/CONTROL
+++ b/ports/arb/CONTROL
@@ -1,4 +1,4 @@
 Source: arb
-Version: 2.11.1-2
+Version: 2.16.0
 Description: a C library for arbitrary-precision interval arithmetic
 Build-Depends: flint
diff --git a/ports/arb/fix-build-error.patch b/ports/arb/fix-build-error.patch
new file mode 100644
index 000000000..7ed2428cf
--- /dev/null
+++ b/ports/arb/fix-build-error.patch
@@ -0,0 +1,24 @@
+diff --git a/acb_dirichlet/stieltjes.c b/acb_dirichlet/stieltjes.c
+index ad6937b..4ca9690 100644
+--- a/acb_dirichlet/stieltjes.c
++++ b/acb_dirichlet/stieltjes.c
+@@ -340,16 +340,16 @@ stieltjes_mag(double n)
+     return t;
+ }
+ 
+-static double _hypot(double x, double y) { return sqrt(x * x + y * y); }
++static double __hypot(double x, double y) { return sqrt(x * x + y * y); }
+ 
+ /* log2 magnitude of integrand at z = x+yi; alpha = a+bi */
+ static double
+ integrand_mag(double n, double x, double y, double a, double b)
+ {
+     double t, u;
+-    t = log(_hypot(a - y, b + x));
++    t = log(__hypot(a - y, b + x));
+     u = atan2(b + x, a - y);
+-    t = log(_hypot(t,u)) * (n+1) - 2.0 * 3.1415926535897932 * x;
++    t = log(__hypot(t,u)) * (n+1) - 2.0 * 3.1415926535897932 * x;
+     return t * 1.44269504088896341;
+ }
+ 
diff --git a/ports/arb/portfile.cmake b/ports/arb/portfile.cmake
index 847120318..3c1196283 100644
--- a/ports/arb/portfile.cmake
+++ b/ports/arb/portfile.cmake
@@ -5,9 +5,10 @@ vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO fredrik-johansson/arb
-    REF 2.11.1
-    SHA512 7a014da5208b55f20c7a3cd3eb51070b09ae107b04cbbd6329925780c2ab4d7c38e1fb3619f21456fa806939818370fcae921f59eb013661b6bdd3d0971e3353
+    REF 2.16.0
+    SHA512 171c965aeb03cd2830df8a53990403c6da480a94d44385dadfbb2d02697f7c03e8b9a217094b0ad93f796d889a1564f4b9ae9db35ef9de90f61bb2e3220911be
     HEAD_REF master
+    PATCHES fix-build-error.patch
 )
 
 file(REMOVE ${SOURCE_PATH}/CMakeLists.txt)
@@ -21,9 +22,8 @@ vcpkg_configure_cmake(
 vcpkg_install_cmake()
 vcpkg_copy_pdbs()
 
+# Remove duplicate headers
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
 
 # Handle copyright
 file(INSTALL ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/arb RENAME copyright)
-
-# Remove duplicate headers
-file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)