diff --git a/tests/lib/catch.hpp b/tests/lib/catch.hpp
index 31745154..8bbc0a5b 100644
--- a/tests/lib/catch.hpp
+++ b/tests/lib/catch.hpp
@@ -1,7 +1,6 @@
-// SPDX-License-Identifier: BSL-1.0
 /*
- *  Catch v2.13.3
- *  Generated: 2020-10-31 18:20:31.045274
+ *  Catch v2.13.4
+ *  Generated: 2020-12-29 14:48:00.116107
  *  ----------------------------------------------------------
  *  This file has been merged from multiple headers. Please don't edit it directly
  *  Copyright (c) 2020 Two Blue Cubes Ltd. All rights reserved.
@@ -16,7 +15,7 @@
 
 #define CATCH_VERSION_MAJOR 2
 #define CATCH_VERSION_MINOR 13
-#define CATCH_VERSION_PATCH 3
+#define CATCH_VERSION_PATCH 4
 
 #ifdef __clang__
 #    pragma clang system_header
@@ -10820,8 +10819,12 @@ namespace Catch {
 
     // 32kb for the alternate stack seems to be sufficient. However, this value
     // is experimentally determined, so that's not guaranteed.
-    static constexpr std::size_t sigStackSize = 32768 >= MINSIGSTKSZ ? 32768 : MINSIGSTKSZ;
+    //static constexpr std::size_t sigStackSize = 32768 >= MINSIGSTKSZ ? 32768 : MINSIGSTKSZ;
 
+    // Since glibc 2.33.9000 MINSIGSTKSZ is no more a constant.  So,
+    // let's hardwire this for now as suggested by
+    // https://github.com/catchorg/Catch2/issues/2178.
+    static constexpr std::size_t sigStackSize = 32768;
     static SignalDefs signalDefs[] = {
         { SIGINT,  "SIGINT - Terminal interrupt signal" },
         { SIGILL,  "SIGILL - Illegal instruction signal" },
@@ -14127,24 +14130,28 @@ namespace Catch {
 
     namespace {
         struct TestHasher {
-            explicit TestHasher(Catch::SimplePcg32& rng_instance) {
-                basis = rng_instance();
-                basis <<= 32;
-                basis |= rng_instance();
-            }
+            using hash_t = uint64_t;
 
-            uint64_t basis;
+            explicit TestHasher( hash_t hashSuffix ):
+                m_hashSuffix{ hashSuffix } {}
 
-            uint64_t operator()(TestCase const& t) const {
-                // Modified FNV-1a hash
-                static constexpr uint64_t prime = 1099511628211;
-                uint64_t hash = basis;
-                for (const char c : t.name) {
+            uint32_t operator()( TestCase const& t ) const {
+                // FNV-1a hash with multiplication fold.
+                const hash_t prime = 1099511628211u;
+                hash_t hash = 14695981039346656037u;
+                for ( const char c : t.name ) {
                     hash ^= c;
                     hash *= prime;
                 }
-                return hash;
+                hash ^= m_hashSuffix;
+                hash *= prime;
+                const uint32_t low{ static_cast<uint32_t>( hash ) };
+                const uint32_t high{ static_cast<uint32_t>( hash >> 32 ) };
+                return low * high;
             }
+
+        private:
+            hash_t m_hashSuffix;
         };
     } // end unnamed namespace
 
@@ -14162,9 +14169,9 @@ namespace Catch {
 
             case RunTests::InRandomOrder: {
                 seedRng( config );
-                TestHasher h( rng() );
+                TestHasher h{ config.rngSeed() };
 
-                using hashedTest = std::pair<uint64_t, TestCase const*>;
+                using hashedTest = std::pair<TestHasher::hash_t, TestCase const*>;
                 std::vector<hashedTest> indexed_tests;
                 indexed_tests.reserve( unsortedTestCases.size() );
 
@@ -15317,7 +15324,7 @@ namespace Catch {
     }
 
     Version const& libraryVersion() {
-        static Version version( 2, 13, 3, "", 0 );
+        static Version version( 2, 13, 4, "", 0 );
         return version;
     }