diff --git a/third_party/libosmium/CHANGELOG.md b/third_party/libosmium/CHANGELOG.md
index d12bb76cf..cc1fdcc8d 100644
--- a/third_party/libosmium/CHANGELOG.md
+++ b/third_party/libosmium/CHANGELOG.md
@@ -6,12 +6,36 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [unreleased] -
 
-### Added
+### Fixed
 
-### Changed
+## [2.11.3] - 2017-05-03
 
 ### Fixed
 
+- Two bugs in area assembler affecting very complex multipolygons and
+  multipolygons with overlapping or nearly overlapping lines.
+- Invalid use of iterators leading to undefined behaviour in area assembler
+  code.
+- Read OPL file correctly even if trailing newline in file is missing.
+
+
+## [2.11.2] - 2017-04-10
+
+### Fixed
+
+- Use minimum size of 64 bytes for buffers. This fixes an infinite loop
+  when buffer size is zero.
+
+
+## [2.11.1] - 2017-03-07
+
+### Fixed
+
+- Terminate called on full non-auto-growing buffer. (Issue #189.)
+- When file formats were used that were not compiled into the binary, it
+  terminated instead of throwing. (Issue #197.)
+- The `Filter::count()` method didn't compile at all.
+
 
 ## [2.11.0] - 2017-01-14
 
@@ -525,7 +549,11 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   Doxygen (up to version 1.8.8). This version contains a workaround to fix
   this.
 
-[unreleased]: https://github.com/osmcode/libosmium/compare/v2.10.3...HEAD
+[unreleased]: https://github.com/osmcode/libosmium/compare/v2.11.3...HEAD
+[2.11.3]: https://github.com/osmcode/libosmium/compare/v2.11.2...v2.11.3
+[2.11.2]: https://github.com/osmcode/libosmium/compare/v2.11.1...v2.11.2
+[2.11.1]: https://github.com/osmcode/libosmium/compare/v2.11.0...v2.11.1
+[2.11.0]: https://github.com/osmcode/libosmium/compare/v2.10.3...v2.11.0
 [2.10.3]: https://github.com/osmcode/libosmium/compare/v2.10.2...v2.10.3
 [2.10.2]: https://github.com/osmcode/libosmium/compare/v2.10.1...v2.10.2
 [2.10.1]: https://github.com/osmcode/libosmium/compare/v2.10.0...v2.10.1
diff --git a/third_party/libosmium/CMakeLists.txt b/third_party/libosmium/CMakeLists.txt
index 21478ec8d..e536c3469 100644
--- a/third_party/libosmium/CMakeLists.txt
+++ b/third_party/libosmium/CMakeLists.txt
@@ -25,7 +25,7 @@ project(libosmium)
 
 set(LIBOSMIUM_VERSION_MAJOR 2)
 set(LIBOSMIUM_VERSION_MINOR 11)
-set(LIBOSMIUM_VERSION_PATCH 0)
+set(LIBOSMIUM_VERSION_PATCH 3)
 
 set(LIBOSMIUM_VERSION
     "${LIBOSMIUM_VERSION_MAJOR}.${LIBOSMIUM_VERSION_MINOR}.${LIBOSMIUM_VERSION_PATCH}")
diff --git a/third_party/libosmium/include/osmium/area/assembler.hpp b/third_party/libosmium/include/osmium/area/assembler.hpp
index 3509b57bc..78a9d09d7 100644
--- a/third_party/libosmium/include/osmium/area/assembler.hpp
+++ b/third_party/libosmium/include/osmium/area/assembler.hpp
@@ -474,17 +474,17 @@ namespace osmium {
 
             class rings_stack_element {
 
-                int32_t m_y;
+                double m_y;
                 detail::ProtoRing* m_ring_ptr;
 
             public:
 
-                rings_stack_element(int32_t y, detail::ProtoRing* ring_ptr) :
+                rings_stack_element(double y, detail::ProtoRing* ring_ptr) :
                     m_y(y),
                     m_ring_ptr(ring_ptr) {
                 }
 
-                int32_t y() const noexcept {
+                double y() const noexcept {
                     return m_y;
                 }
 
@@ -504,7 +504,7 @@ namespace osmium {
                     return m_y < rhs.m_y;
                 }
 
-            }; // class ring_stack_element
+            }; // class rings_stack_element
 
             using rings_stack = std::vector<rings_stack_element>;
 
@@ -592,7 +592,7 @@ namespace osmium {
                                 if (debug()) {
                                     std::cerr << "        Segment belongs to outer ring\n";
                                 }
-                                const int32_t y = int32_t(ay + (by - ay) * (lx - ax) / (bx - ax));
+                                const double y = ay + (by - ay) * (lx - ax) / double(bx - ax);
                                 outer_rings.emplace_back(y, segment->ring());
                             }
                         }
@@ -859,8 +859,8 @@ namespace osmium {
             }
 
             void merge_two_rings(open_ring_its_type& open_ring_its, const location_to_ring_map& m1, const location_to_ring_map& m2) {
-                auto& r1 = *m1.ring_it;
-                auto& r2 = *m2.ring_it;
+                std::list<detail::ProtoRing>::iterator r1 = *m1.ring_it;
+                std::list<detail::ProtoRing>::iterator r2 = *m2.ring_it;
 
                 if (r1->get_node_ref_stop().location() == r2->get_node_ref_start().location()) {
                     r1->join_forward(*r2);
@@ -876,11 +876,11 @@ namespace osmium {
                     assert(false);
                 }
 
+                open_ring_its.erase(std::find(open_ring_its.begin(), open_ring_its.end(), r2));
                 m_rings.erase(r2);
-                open_ring_its.remove(r2);
 
                 if (r1->closed()) {
-                    open_ring_its.remove(r1);
+                    open_ring_its.erase(std::find(open_ring_its.begin(), open_ring_its.end(), r1));
                 }
             }
 
@@ -988,6 +988,7 @@ namespace osmium {
                             }
                             loc_done.insert(c.stop_location);
                             find_candidates(candidates, loc_done, xrings, c);
+                            loc_done.erase(c.stop_location);
                             if (debug()) {
                                 std::cerr << "          ...back\n";
                             }
@@ -1085,12 +1086,13 @@ namespace osmium {
                 // Join all (open) rings in the candidate to get one closed ring.
                 assert(chosen_cand->rings.size() > 1);
                 const auto& first_ring = chosen_cand->rings.front().first;
-                for (auto it = chosen_cand->rings.begin() + 1; it != chosen_cand->rings.end(); ++it) {
+                const detail::ProtoRing& remaining_ring = first_ring.ring();
+                for (auto it = std::next(chosen_cand->rings.begin()); it != chosen_cand->rings.end(); ++it) {
                     merge_two_rings(open_ring_its, first_ring, it->first);
                 }
 
                 if (debug()) {
-                    std::cerr << "    Merged to " << first_ring.ring() << "\n";
+                    std::cerr << "    Merged to " << remaining_ring << "\n";
                 }
 
                 return true;
diff --git a/third_party/libosmium/include/osmium/builder/builder.hpp b/third_party/libosmium/include/osmium/builder/builder.hpp
index 107f4a9d0..d4358843b 100644
--- a/third_party/libosmium/include/osmium/builder/builder.hpp
+++ b/third_party/libosmium/include/osmium/builder/builder.hpp
@@ -167,6 +167,20 @@ namespace osmium {
                 return length;
             }
 
+            /**
+             * Append data to buffer and append an additional \0.
+             *
+             * @param data Pointer to data.
+             * @param length Length of data in bytes.
+             * @returns The number of bytes appended (length + 1).
+             */
+            osmium::memory::item_size_type append_with_zero(const char* data, const osmium::memory::item_size_type length) {
+                unsigned char* target = reserve_space(length + 1);
+                std::copy_n(reinterpret_cast<const unsigned char*>(data), length, target);
+                target[length] = '\0';
+                return length + 1;
+            }
+
             /**
              * Append \0-terminated string to buffer.
              *
@@ -180,9 +194,11 @@ namespace osmium {
             /**
              * Append '\0' to the buffer.
              *
+             * @deprecated Use append_with_zero() instead.
+             *
              * @returns The number of bytes appended (always 1).
              */
-            osmium::memory::item_size_type append_zero() {
+            OSMIUM_DEPRECATED osmium::memory::item_size_type append_zero() {
                 *reserve_space(1) = '\0';
                 return 1;
             }
diff --git a/third_party/libosmium/include/osmium/builder/osm_object_builder.hpp b/third_party/libosmium/include/osmium/builder/osm_object_builder.hpp
index 1dd5f972f..d4483b192 100644
--- a/third_party/libosmium/include/osmium/builder/osm_object_builder.hpp
+++ b/third_party/libosmium/include/osmium/builder/osm_object_builder.hpp
@@ -99,7 +99,8 @@ namespace osmium {
                 if (std::strlen(value) > osmium::max_osm_string_length) {
                     throw std::length_error("OSM tag value is too long");
                 }
-                add_size(append(key) + append(value));
+                add_size(append(key));
+                add_size(append(value));
             }
 
             /**
@@ -117,8 +118,8 @@ namespace osmium {
                 if (value_length > osmium::max_osm_string_length) {
                     throw std::length_error("OSM tag value is too long");
                 }
-                add_size(append(key,   osmium::memory::item_size_type(key_length))   + append_zero() +
-                         append(value, osmium::memory::item_size_type(value_length)) + append_zero());
+                add_size(append_with_zero(key,   osmium::memory::item_size_type(key_length)));
+                add_size(append_with_zero(value, osmium::memory::item_size_type(value_length)));
             }
 
             /**
@@ -134,8 +135,8 @@ namespace osmium {
                 if (value.size() > osmium::max_osm_string_length) {
                     throw std::length_error("OSM tag value is too long");
                 }
-                add_size(append(key.data(),   osmium::memory::item_size_type(key.size())   + 1) +
-                         append(value.data(), osmium::memory::item_size_type(value.size()) + 1));
+                add_size(append(key.data(),   osmium::memory::item_size_type(key.size())   + 1));
+                add_size(append(value.data(), osmium::memory::item_size_type(value.size()) + 1));
             }
 
             /**
@@ -144,7 +145,8 @@ namespace osmium {
              * @param tag Tag.
              */
             void add_tag(const osmium::Tag& tag) {
-                add_size(append(tag.key()) + append(tag.value()));
+                add_size(append(tag.key()));
+                add_size(append(tag.value()));
             }
 
             /**
@@ -226,7 +228,7 @@ namespace osmium {
                     throw std::length_error("OSM relation member role is too long");
                 }
                 member.set_role_size(osmium::string_size_type(length) + 1);
-                add_size(append(role, osmium::memory::item_size_type(length)) + append_zero());
+                add_size(append_with_zero(role, osmium::memory::item_size_type(length)));
                 add_padding(true);
             }
 
@@ -310,7 +312,7 @@ namespace osmium {
                     throw std::length_error("OSM user name is too long");
                 }
                 comment.set_user_size(osmium::string_size_type(length) + 1);
-                add_size(append(user, osmium::memory::item_size_type(length)) + append_zero());
+                add_size(append_with_zero(user, osmium::memory::item_size_type(length)));
             }
 
             void add_text(osmium::ChangesetComment& comment, const char* text, const size_t length) {
@@ -322,7 +324,7 @@ namespace osmium {
                     throw std::length_error("OSM changeset comment is too long");
                 }
                 comment.set_text_size(osmium::string_size_type(length) + 1);
-                add_size(append(text, osmium::memory::item_size_type(length)) + append_zero());
+                add_size(append_with_zero(text, osmium::memory::item_size_type(length)));
                 add_padding(true);
             }
 
diff --git a/third_party/libosmium/include/osmium/io/detail/opl_input_format.hpp b/third_party/libosmium/include/osmium/io/detail/opl_input_format.hpp
index 135f1a5e0..62598f706 100644
--- a/third_party/libosmium/include/osmium/io/detail/opl_input_format.hpp
+++ b/third_party/libosmium/include/osmium/io/detail/opl_input_format.hpp
@@ -123,6 +123,11 @@ namespace osmium {
                         rest = input.substr(ppos);
                     }
 
+                    if (!rest.empty()) {
+                        m_data = rest.data();
+                        parse_line();
+                    }
+
                     if (m_buffer.committed() > 0) {
                         send_to_output_queue(std::move(m_buffer));
                     }
diff --git a/third_party/libosmium/include/osmium/io/reader.hpp b/third_party/libosmium/include/osmium/io/reader.hpp
index c39eaaa62..825cb41ce 100644
--- a/third_party/libosmium/include/osmium/io/reader.hpp
+++ b/third_party/libosmium/include/osmium/io/reader.hpp
@@ -92,6 +92,8 @@ namespace osmium {
 
             osmium::io::File m_file;
 
+            detail::ParserFactory::create_parser_type m_creator;
+
             enum class status {
                 okay   = 0, // normal reading
                 error  = 1, // some error occurred while reading
@@ -128,13 +130,12 @@ namespace osmium {
             }
 
             // This function will run in a separate thread.
-            static void parser_thread(const osmium::io::File& file,
+            static void parser_thread(const detail::ParserFactory::create_parser_type& creator,
                                       detail::future_string_queue_type& input_queue,
                                       detail::future_buffer_queue_type& osmdata_queue,
                                       std::promise<osmium::io::Header>&& header_promise,
                                       osmium::io::detail::reader_options options) {
                 std::promise<osmium::io::Header> promise = std::move(header_promise);
-                const auto creator = detail::ParserFactory::instance().get_creator_function(file);
                 const auto parser = creator(input_queue, osmdata_queue, promise, options);
                 parser->parse();
             }
@@ -236,6 +237,7 @@ namespace osmium {
             template <typename... TArgs>
             explicit Reader(const osmium::io::File& file, TArgs&&... args) :
                 m_file(file.check()),
+                m_creator(detail::ParserFactory::instance().get_creator_function(m_file)),
                 m_status(status::okay),
                 m_childpid(0),
                 m_input_queue(detail::get_input_queue_size(), "raw_input"),
@@ -256,7 +258,7 @@ namespace osmium {
 
                 std::promise<osmium::io::Header> header_promise;
                 m_header_future = header_promise.get_future();
-                m_thread = osmium::thread::thread_handler{parser_thread, std::ref(m_file), std::ref(m_input_queue), std::ref(m_osmdata_queue), std::move(header_promise), m_options};
+                m_thread = osmium::thread::thread_handler{parser_thread, std::ref(m_creator), std::ref(m_input_queue), std::ref(m_osmdata_queue), std::move(header_promise), m_options};
             }
 
             template <typename... TArgs>
diff --git a/third_party/libosmium/include/osmium/memory/buffer.hpp b/third_party/libosmium/include/osmium/memory/buffer.hpp
index 370d01e0b..1b75b4fa5 100644
--- a/third_party/libosmium/include/osmium/memory/buffer.hpp
+++ b/third_party/libosmium/include/osmium/memory/buffer.hpp
@@ -119,6 +119,15 @@ namespace osmium {
             auto_grow m_auto_grow{auto_grow::no};
             std::function<void(Buffer&)> m_full;
 
+            static size_t calculate_capacity(size_t capacity) noexcept {
+                // The majority of all Nodes will fit into this size.
+                constexpr static const size_t min_capacity = 64;
+                if (capacity < min_capacity) {
+                    return min_capacity;
+                }
+                return capacity;
+            }
+
         public:
 
             /**
@@ -198,13 +207,13 @@ namespace osmium {
              *         of the alignment.
              */
             explicit Buffer(size_t capacity, auto_grow auto_grow = auto_grow::yes) :
-                m_memory(new unsigned char[capacity]),
+                m_memory(new unsigned char[calculate_capacity(capacity)]),
                 m_data(m_memory.get()),
-                m_capacity(capacity),
+                m_capacity(calculate_capacity(capacity)),
                 m_written(0),
                 m_committed(0),
                 m_auto_grow(auto_grow) {
-                if (capacity % align_bytes != 0) {
+                if (m_capacity % align_bytes != 0) {
                     throw std::invalid_argument("buffer capacity needs to be multiple of alignment");
                 }
             }
diff --git a/third_party/libosmium/include/osmium/tags/filter.hpp b/third_party/libosmium/include/osmium/tags/filter.hpp
index 22abb1430..797565db8 100644
--- a/third_party/libosmium/include/osmium/tags/filter.hpp
+++ b/third_party/libosmium/include/osmium/tags/filter.hpp
@@ -140,7 +140,7 @@ namespace osmium {
              * Return the number of rules in this filter.
              */
             size_t count() const {
-                return m_rules.count();
+                return m_rules.size();
             }
 
             /**
diff --git a/third_party/libosmium/include/osmium/version.hpp b/third_party/libosmium/include/osmium/version.hpp
index d32641a55..a36a4d900 100644
--- a/third_party/libosmium/include/osmium/version.hpp
+++ b/third_party/libosmium/include/osmium/version.hpp
@@ -35,8 +35,8 @@ DEALINGS IN THE SOFTWARE.
 
 #define LIBOSMIUM_VERSION_MAJOR 2
 #define LIBOSMIUM_VERSION_MINOR 11
-#define LIBOSMIUM_VERSION_PATCH 0
+#define LIBOSMIUM_VERSION_PATCH 3
 
-#define LIBOSMIUM_VERSION_STRING "2.11.0"
+#define LIBOSMIUM_VERSION_STRING "2.11.3"
 
 #endif // OSMIUM_VERSION_HPP
diff --git a/third_party/libosmium/test/CMakeLists.txt b/third_party/libosmium/test/CMakeLists.txt
index db0e93485..68f8887c4 100644
--- a/third_party/libosmium/test/CMakeLists.txt
+++ b/third_party/libosmium/test/CMakeLists.txt
@@ -167,9 +167,10 @@ add_unit_test(io test_compression_factory)
 add_unit_test(io test_bzip2 ENABLE_IF ${BZIP2_FOUND} LIBS ${BZIP2_LIBRARIES})
 add_unit_test(io test_file_formats)
 add_unit_test(io test_reader LIBS "${OSMIUM_XML_LIBRARIES};${OSMIUM_PBF_LIBRARIES}")
+add_unit_test(io test_reader_fileformat ENABLE_IF ${Threads_FOUND} LIBS ${CMAKE_THREAD_LIBS_INIT})
 add_unit_test(io test_reader_with_mock_decompression ENABLE_IF ${Threads_FOUND} LIBS ${OSMIUM_XML_LIBRARIES})
 add_unit_test(io test_reader_with_mock_parser ENABLE_IF ${Threads_FOUND} LIBS ${CMAKE_THREAD_LIBS_INIT})
-add_unit_test(io test_opl_parser)
+add_unit_test(io test_opl_parser ENABLE_IF ${Threads_FOUND} LIBS ${CMAKE_THREAD_LIBS_INIT})
 add_unit_test(io test_output_utils)
 add_unit_test(io test_output_iterator ENABLE_IF ${Threads_FOUND} LIBS ${CMAKE_THREAD_LIBS_INIT})
 add_unit_test(io test_string_table)
diff --git a/third_party/libosmium/test/t/io/data-nonl.opl b/third_party/libosmium/test/t/io/data-nonl.opl
new file mode 100644
index 000000000..db2354439
--- /dev/null
+++ b/third_party/libosmium/test/t/io/data-nonl.opl
@@ -0,0 +1 @@
+n1 v1 dV c1 t2014-01-01T00:00:00Z i1 utest T x1.02 y1.02
\ No newline at end of file
diff --git a/third_party/libosmium/test/t/io/data.opl b/third_party/libosmium/test/t/io/data.opl
new file mode 100644
index 000000000..2c7e2a35f
--- /dev/null
+++ b/third_party/libosmium/test/t/io/data.opl
@@ -0,0 +1 @@
+n1 v1 dV c1 t2014-01-01T00:00:00Z i1 utest T x1.02 y1.02
diff --git a/third_party/libosmium/test/t/io/test_opl_parser.cpp b/third_party/libosmium/test/t/io/test_opl_parser.cpp
index 9ad6eeb75..dad223865 100644
--- a/third_party/libosmium/test/t/io/test_opl_parser.cpp
+++ b/third_party/libosmium/test/t/io/test_opl_parser.cpp
@@ -3,8 +3,10 @@
 #include <cstring>
 
 #include "catch.hpp"
+#include "utils.hpp"
 
 #include <osmium/io/detail/opl_input_format.hpp>
+#include <osmium/io/opl_input.hpp>
 #include <osmium/opl.hpp>
 
 namespace oid = osmium::io::detail;
@@ -1073,3 +1075,23 @@ TEST_CASE("Parse line with external interface") {
 
 }
 
+TEST_CASE("Parse OPL using Reader") {
+    osmium::io::File file{with_data_dir("t/io/data.opl")};
+    osmium::io::Reader reader{file};
+
+    const auto buffer = reader.read();
+    REQUIRE(buffer);
+    const auto& node = buffer.get<osmium::Node>(0);
+    REQUIRE(node.id() == 1);
+}
+
+TEST_CASE("Parse OPL with missing newline using Reader") {
+    osmium::io::File file{with_data_dir("t/io/data-nonl.opl")};
+    osmium::io::Reader reader{file};
+
+    const auto buffer = reader.read();
+    REQUIRE(buffer);
+    const auto& node = buffer.get<osmium::Node>(0);
+    REQUIRE(node.id() == 1);
+}
+
diff --git a/third_party/libosmium/test/t/io/test_reader_fileformat.cpp b/third_party/libosmium/test/t/io/test_reader_fileformat.cpp
new file mode 100644
index 000000000..a64932e70
--- /dev/null
+++ b/third_party/libosmium/test/t/io/test_reader_fileformat.cpp
@@ -0,0 +1,10 @@
+
+#include "catch.hpp"
+#include "utils.hpp"
+
+#include <osmium/io/reader.hpp>
+
+TEST_CASE("Reader throws on unsupported file format") {
+    REQUIRE_THROWS_AS(osmium::io::Reader{with_data_dir("t/io/data.osm")}, osmium::unsupported_file_format_error);
+}
+
diff --git a/third_party/libosmium/test/t/memory/test_buffer_basics.cpp b/third_party/libosmium/test/t/memory/test_buffer_basics.cpp
index ffe725168..d9d174b0f 100644
--- a/third_party/libosmium/test/t/memory/test_buffer_basics.cpp
+++ b/third_party/libosmium/test/t/memory/test_buffer_basics.cpp
@@ -6,8 +6,8 @@ TEST_CASE("Buffer basics") {
 
     osmium::memory::Buffer invalid_buffer1;
     osmium::memory::Buffer invalid_buffer2;
-    osmium::memory::Buffer empty_buffer1(1024);
-    osmium::memory::Buffer empty_buffer2(2048);
+    osmium::memory::Buffer empty_buffer1{1024};
+    osmium::memory::Buffer empty_buffer2{2048};
 
     REQUIRE(!invalid_buffer1);
     REQUIRE(!invalid_buffer2);
@@ -32,3 +32,18 @@ TEST_CASE("Buffer basics") {
 
 }
 
+TEST_CASE("Buffer with zero size") {
+    osmium::memory::Buffer buffer{0};
+    REQUIRE(buffer.capacity() == 64);
+}
+
+TEST_CASE("Buffer with less than minimum size") {
+    osmium::memory::Buffer buffer{63};
+    REQUIRE(buffer.capacity() == 64);
+}
+
+TEST_CASE("Buffer with minimum size") {
+    osmium::memory::Buffer buffer{64};
+    REQUIRE(buffer.capacity() == 64);
+}
+