diff --git a/CMakeLists.txt b/CMakeLists.txt
index f4d4c7f49..3c64604d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,7 +72,6 @@ find_package(OpenMP)
 find_package(Opal)
 find_package(IBVerbs)
 find_package(RDMACM)
-find_package(spdlog)
 find_package(Etherlab)
 find_package(Lua)
 find_package(LibDataChannel)
diff --git a/common b/common
index 08fd24b85..785d94cac 160000
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit 08fd24b85ec4e5b18f370702eb129b4f1d1e4bca
+Subproject commit 785d94caccc1e43853439cb6bd1e1c170fff42a9
diff --git a/fpga b/fpga
index 1cac3fafd..4e59f0d04 160000
--- a/fpga
+++ b/fpga
@@ -1 +1 @@
-Subproject commit 1cac3fafde6ef3098a145f9d5d936a2dc6b7d7c0
+Subproject commit 4e59f0d04bfe5f741b5a1345c858fa0074190f5d
diff --git a/include/villas/node.hpp b/include/villas/node.hpp
index 73c7dd491..80343e32b 100644
--- a/include/villas/node.hpp
+++ b/include/villas/node.hpp
@@ -7,8 +7,8 @@
 
 #pragma once
 
+#include <iostream>
 #include <jansson.h>
-#include <spdlog/fmt/ostr.h>
 #include <uuid/uuid.h>
 
 #include <villas/colors.hpp>
@@ -25,6 +25,10 @@
 #include <villas/sample.hpp>
 #include <villas/stats.hpp>
 
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+#include <fmt/ostream.h>
+#endif
+
 #if defined(LIBNL3_ROUTE_FOUND) && defined(__linux__)
 #define WITH_NETEM
 #endif // LIBNL3_ROUTE_FOUND
@@ -260,9 +264,7 @@ public:
 
   void setEnabled(bool en) { enabled = en; }
 
-  // Custom formatter for spdlog
-  template <typename OStream>
-  friend OStream &operator<<(OStream &os, const Node &n) {
+  friend std::ostream &operator<<(std::ostream &os, const Node &n) {
     os << n.getName();
 
     return os;
@@ -317,9 +319,7 @@ public:
 
   virtual std::string getType() const { return "node"; }
 
-  // Custom formatter for spdlog
-  template <typename OStream>
-  friend OStream &operator<<(OStream &os, const NodeFactory &f) {
+  friend std::ostream &operator<<(std::ostream &os, const NodeFactory &f) {
     os << f.getName();
 
     return os;
@@ -366,3 +366,11 @@ public:
 
 } // namespace node
 } // namespace villas
+
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+template <>
+class fmt::formatter<villas::node::Node> : public fmt::ostream_formatter {};
+template <>
+class fmt::formatter<villas::node::NodeFactory>
+    : public fmt::ostream_formatter {};
+#endif
diff --git a/include/villas/node_compat_type.hpp b/include/villas/node_compat_type.hpp
index 72877456b..86c47b553 100644
--- a/include/villas/node_compat_type.hpp
+++ b/include/villas/node_compat_type.hpp
@@ -8,7 +8,6 @@
 #pragma once
 
 #include <jansson.h>
-#include <spdlog/fmt/ostr.h>
 
 #include <villas/common.hpp>
 #include <villas/log.hpp>
diff --git a/include/villas/nodes/redis.hpp b/include/villas/nodes/redis.hpp
index ab9b43c4d..33710dcab 100644
--- a/include/villas/nodes/redis.hpp
+++ b/include/villas/nodes/redis.hpp
@@ -26,6 +26,25 @@ namespace node {
 
 enum class RedisMode { KEY, HASH, CHANNEL };
 
+inline std::ostream &operator<<(std::ostream &os, const enum villas::node::RedisMode &m) {
+  switch (m) {
+  case villas::node::RedisMode::KEY:
+    os << "key";
+    break;
+
+  case villas::node::RedisMode::HASH:
+    os << "hash";
+    break;
+
+  case villas::node::RedisMode::CHANNEL:
+    os << "channel";
+    break;
+  }
+
+  return os;
+}
+
+
 class RedisConnection {
 
 public:
diff --git a/include/villas/nodes/redis_helpers.hpp b/include/villas/nodes/redis_helpers.hpp
index 701bde7ec..292c5f423 100644
--- a/include/villas/nodes/redis_helpers.hpp
+++ b/include/villas/nodes/redis_helpers.hpp
@@ -9,11 +9,14 @@
 
 #include <chrono>
 #include <functional>
-#include <spdlog/fmt/ostr.h>
+#include <sw/redis++/connection.h>
 #include <sw/redis++/redis++.h>
-
 #include <villas/node/config.hpp>
 
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+#include <fmt/ostream.h>
+#endif
+
 namespace std {
 
 template <typename _rep, typename ratio>
@@ -52,7 +55,7 @@ template <> struct hash<sw::redis::ConnectionOptions> {
 namespace sw {
 namespace redis {
 
-bool operator==(const tls::TlsOptions &o1, const tls::TlsOptions &o2) {
+inline bool operator==(const tls::TlsOptions &o1, const tls::TlsOptions &o2) {
 #ifdef REDISPP_WITH_TLS
   return o1.enabled == o2.enabled && o1.cacert == o2.cacert &&
          o1.cacertdir == o2.cacertdir && o1.cert == o2.cert &&
@@ -62,7 +65,7 @@ bool operator==(const tls::TlsOptions &o1, const tls::TlsOptions &o2) {
 #endif // REDISPP_WITH_TLS
 }
 
-bool operator==(const ConnectionOptions &o1, const ConnectionOptions &o2) {
+inline bool operator==(const ConnectionOptions &o1, const ConnectionOptions &o2) {
   return o1.type == o2.type && o1.host == o2.host && o1.port == o2.port &&
          o1.path == o2.path && o1.user == o2.user &&
          o1.password == o2.password && o1.db == o2.db &&
@@ -72,8 +75,8 @@ bool operator==(const ConnectionOptions &o1, const ConnectionOptions &o2) {
 }
 
 #ifdef REDISPP_WITH_TLS
-template <typename OStream>
-OStream &operator<<(OStream &os, const tls::TlsOptions &t) {
+namespace tls {
+std::ostream &operator<<(std::ostream &os, const TlsOptions &t) {
   os << "tls.enabled=" << (t.enabled ? "yes" : "no");
 
   if (t.enabled) {
@@ -95,10 +98,10 @@ OStream &operator<<(OStream &os, const tls::TlsOptions &t) {
 
   return os;
 }
+}
 #endif // REDISPP_WITH_TLS
 
-template <typename OStream>
-OStream &operator<<(OStream &os, const ConnectionType &t) {
+inline std::ostream &operator<<(std::ostream &os, const ConnectionType &t) {
   switch (t) {
   case ConnectionType::TCP:
     os << "tcp";
@@ -112,8 +115,7 @@ OStream &operator<<(OStream &os, const ConnectionType &t) {
   return os;
 }
 
-template <typename OStream>
-OStream &operator<<(OStream &os, const ConnectionOptions &o) {
+inline std::ostream &operator<<(std::ostream &os, const ConnectionOptions &o) {
   os << "type=" << o.type;
 
   switch (o.type) {
@@ -139,36 +141,31 @@ OStream &operator<<(OStream &os, const ConnectionOptions &o) {
 } // namespace redis
 } // namespace sw
 
-template <typename OStream>
-OStream &operator<<(OStream &os, const enum villas::node::RedisMode &m) {
-  switch (m) {
-  case villas::node::RedisMode::KEY:
-    os << "key";
-    break;
-
-  case villas::node::RedisMode::HASH:
-    os << "hash";
-    break;
-
-  case villas::node::RedisMode::CHANNEL:
-    os << "channel";
-    break;
-  }
-
-  return os;
-}
-
 namespace villas {
 namespace node {
 #ifdef REDISPP_WITH_URI
-sw::redis::ConnectionOptions make_redis_connection_options(char const *uri) {
+inline sw::redis::ConnectionOptions make_redis_connection_options(char const *uri) {
   auto u = sw::redis::Uri{uri};
   return u.connection_options();
 }
 #else
-sw::redis::ConnectionOptions make_redis_connection_options(char const *uri) {
+inline sw::redis::ConnectionOptions make_redis_connection_options(char const *uri) {
   return sw::redis::ConnectionOptions{uri};
 }
 #endif
 } // namespace node
 } // namespace villas
+
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+template <>
+class fmt::formatter<sw::redis::ConnectionType>
+    : public fmt::ostream_formatter {};
+template <>
+class fmt::formatter<sw::redis::ConnectionOptions>
+    : public fmt::ostream_formatter {};
+#ifdef REDISPP_WITH_TLS
+template <>
+class fmt::formatter<sw::redis::tls::TlsOptions>
+    : public fmt::ostream_formatter {};
+#endif
+#endif
diff --git a/include/villas/nodes/webrtc/peer_connection.hpp b/include/villas/nodes/webrtc/peer_connection.hpp
index 26fb62d74..47f246413 100644
--- a/include/villas/nodes/webrtc/peer_connection.hpp
+++ b/include/villas/nodes/webrtc/peer_connection.hpp
@@ -9,7 +9,9 @@
 
 #pragma once
 
+#include <fmt/ostream.h>
 #include <jansson.h>
+#include <rtc/peerconnection.hpp>
 #include <rtc/rtc.hpp>
 
 #include <villas/log.hpp>
@@ -17,6 +19,32 @@
 #include <villas/signal_list.hpp>
 #include <villas/web.hpp>
 
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+#include <fmt/ostream.h>
+#endif
+
+/*
+ * libdatachannel defines the operator<< overloads required to format
+ * rtc::PeerConnection::State and similar in the global namespace.
+ * But C++ ADL based overload set construction does not find these operators,
+ * if these are invoked in the spdlog/fmt libraries.
+ *
+ * See this issue for a short explaination of ADL errors:
+ * https://github.com/gabime/spdlog/issues/1227#issuecomment-532009129
+ *
+ * Adding the global ::operator<< overload set to the namespace rtc where
+ * the data structures are defined, allows ADL to pick these up in spdlog/fmt.
+ */
+namespace rtc {
+using ::operator<<;
+}
+
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+template <>
+class fmt::formatter<rtc::PeerConnection::State>
+    : public fmt::ostream_formatter {};
+#endif
+
 namespace villas {
 namespace node {
 namespace webrtc {
diff --git a/include/villas/nodes/websocket.hpp b/include/villas/nodes/websocket.hpp
index d7f91471e..d3791399e 100644
--- a/include/villas/nodes/websocket.hpp
+++ b/include/villas/nodes/websocket.hpp
@@ -8,7 +8,6 @@
 #pragma once
 
 #include <libwebsockets.h>
-#include <spdlog/fmt/ostr.h>
 
 #include <villas/buffer.hpp>
 #include <villas/common.hpp>
@@ -19,6 +18,10 @@
 #include <villas/pool.hpp>
 #include <villas/queue_signalled.h>
 
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+#include <fmt/ostream.h>
+#endif
+
 // Forward declarations
 struct lws;
 
@@ -75,9 +78,7 @@ struct websocket_connection {
         *send; // A buffer for constructing messages before calling lws_write()
   } buffers;
 
-  // Custom formatter for spdlog
-  template <typename OStream>
-  friend OStream &operator<<(OStream &os,
+  friend std::ostream &operator<<(std::ostream &os,
                              const struct websocket_connection &c) {
     if (c.wsi) {
       char name[128];
@@ -133,3 +134,9 @@ int websocket_write(NodeCompat *n, struct Sample *const smps[], unsigned cnt);
 
 } // namespace node
 } // namespace villas
+
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+template <>
+class fmt::formatter<villas::node::websocket_connection>
+    : public fmt::ostream_formatter {};
+#endif
diff --git a/include/villas/path.hpp b/include/villas/path.hpp
index 90e06b499..b4fc97b33 100644
--- a/include/villas/path.hpp
+++ b/include/villas/path.hpp
@@ -11,7 +11,6 @@
 
 #include <jansson.h>
 #include <pthread.h>
-#include <spdlog/fmt/ostr.h>
 #include <uuid/uuid.h>
 
 #include <villas/colors.hpp>
@@ -26,9 +25,12 @@
 #include <villas/queue.h>
 #include <villas/signal_list.hpp>
 #include <villas/task.hpp>
-
 #include <villas/log.hpp>
 
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+#include <fmt/ostream.h>
+#endif
+
 // Forward declarations
 struct pollfd;
 
@@ -99,9 +101,7 @@ public:
   std::bitset<MAX_SAMPLE_LENGTH>
       received; // A mask of PathSources for which we already received samples.
 
-  // Custom formatter for spdlog
-  template <typename OStream>
-  friend OStream &operator<<(OStream &os, const Path &p) {
+  friend std::ostream &operator<<(std::ostream &os, const Path &p) {
     if (p.sources.size() > 1)
       os << "[ ";
 
@@ -185,3 +185,9 @@ public:
 
 } // namespace node
 } // namespace villas
+
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+template <>
+class fmt::formatter<villas::node::Path>
+    : public fmt::ostream_formatter {};
+#endif
diff --git a/lib/hooks/limit_rate.cpp b/lib/hooks/limit_rate.cpp
index 80cf00b22..65075e06b 100644
--- a/lib/hooks/limit_rate.cpp
+++ b/lib/hooks/limit_rate.cpp
@@ -39,7 +39,7 @@ void LimitRateHook::parse(json_t *json) {
       mode = LIMIT_RATE_LOCAL;
     else
       throw ConfigError(json, "node-config-hook-limit_rate-mode",
-                        "Invalid value '{}' for setting 'mode'", mode);
+                        "Invalid value '{}' for setting 'mode'", m);
   }
 
   deadtime = 1.0 / rate;
diff --git a/lib/nodes/iec60870.cpp b/lib/nodes/iec60870.cpp
index a05ee4890..87f9cbbdc 100644
--- a/lib/nodes/iec60870.cpp
+++ b/lib/nodes/iec60870.cpp
@@ -576,7 +576,7 @@ bool SlaveNode::onInterrogation(IMasterConnection connection, CS101_ASDU asdu,
 
 bool SlaveNode::onASDU(IMasterConnection connection,
                        CS101_ASDU asdu) const noexcept {
-  logger->warn("Ignoring ASDU type {}", CS101_ASDU_getTypeID(asdu));
+  logger->warn("Ignoring ASDU type {}", (int)CS101_ASDU_getTypeID(asdu));
   return true;
 }
 
diff --git a/lib/nodes/infiniband.cpp b/lib/nodes/infiniband.cpp
index 032d7f864..cfbc352c4 100644
--- a/lib/nodes/infiniband.cpp
+++ b/lib/nodes/infiniband.cpp
@@ -577,7 +577,7 @@ static void *ib_rdma_cm_event_thread(void *ctx) {
       break;
 
     default:
-      throw RuntimeError("Unknown event occurred: {}", event->event);
+      throw RuntimeError("Unknown event occurred: {}", (int)event->event);
     }
 
     rdma_ack_cm_event(event);
@@ -836,7 +836,7 @@ int villas::node::ib_read(NodeCompat *n, struct Sample *const smps[],
         n->logger->debug("Received IBV_WC_WR_FLUSH_ERR (ib_read). Ignore it.");
       else if (wc[j].status != IBV_WC_SUCCESS)
         n->logger->warn("Work Completion status was not IBV_WC_SUCCESS: {}",
-                        wc[j].status);
+                        (int)wc[j].status);
 
       /* 32 byte of meta data is always transferred. We should substract it.
 			 * Furthermore, in case of an unreliable connection, a 40 byte
@@ -987,7 +987,7 @@ int villas::node::ib_write(NodeCompat *n, struct Sample *const smps[],
     for (int i = 0; i < ret; i++) {
       if (wc[i].status != IBV_WC_SUCCESS && wc[i].status != IBV_WC_WR_FLUSH_ERR)
         n->logger->warn("Work Completion status was not IBV_WC_SUCCESS: {}",
-                        wc[i].status);
+                        (int)wc[i].status);
 
       // TODO: fix release logic
       // smps[*release] = (struct Sample *) (wc[i].wr_id);
diff --git a/lib/nodes/webrtc/peer_connection.cpp b/lib/nodes/webrtc/peer_connection.cpp
index e32e58eef..3a5f3d383 100644
--- a/lib/nodes/webrtc/peer_connection.cpp
+++ b/lib/nodes/webrtc/peer_connection.cpp
@@ -24,22 +24,6 @@ using namespace villas;
 using namespace villas::node;
 using namespace villas::node::webrtc;
 
-/*
- * libdatachannel defines the operator<< overloads required to format
- * rtc::PeerConnection::State and similar in the global namespace.
- * But C++ ADL based overload set construction does not find these operators,
- * if these are invoked in the spdlog/fmt libraries.
- *
- * See this issue for a short explaination of ADL errors:
- * https://github.com/gabime/spdlog/issues/1227#issuecomment-532009129
- *
- * Adding the global ::operator<< overload set to the namespace rtc where
- * the data structures are defined, allows ADL to pick these up in spdlog/fmt.
- */
-namespace rtc {
-using ::operator<<;
-}
-
 PeerConnection::PeerConnection(const std::string &server,
                                const std::string &session,
                                const std::string &peer,
diff --git a/lib/nodes/websocket.cpp b/lib/nodes/websocket.cpp
index 3520cd8e9..4fa92b851 100644
--- a/lib/nodes/websocket.cpp
+++ b/lib/nodes/websocket.cpp
@@ -124,7 +124,7 @@ static void websocket_connection_close(struct websocket_connection *c,
 
   c->node->logger->debug(
       "Closing WebSocket connection with {}: status={}, reason={}",
-      c->toString(), status, reason);
+      c->toString(), (int)status, reason);
 
   c->state = websocket_connection::State::CLOSED;
 }