diff --git a/lib/ldclient-rb/evaluation.rb b/lib/ldclient-rb/evaluation.rb
index 5ff32dc4..2b98c648 100644
--- a/lib/ldclient-rb/evaluation.rb
+++ b/lib/ldclient-rb/evaluation.rb
@@ -156,7 +156,7 @@ def eval_internal(flag, user, store, events)
               failed_prereq = true
             end
           rescue => exn
-            @config.logger.error("[LDClient] Error evaluating prerequisite: #{exn.inspect}")
+            @config.logger.error { "[LDClient] Error evaluating prerequisite: #{exn.inspect}" }
             failed_prereq = true
           end
         end
diff --git a/lib/ldclient-rb/events.rb b/lib/ldclient-rb/events.rb
index f4874538..84ea0275 100644
--- a/lib/ldclient-rb/events.rb
+++ b/lib/ldclient-rb/events.rb
@@ -50,9 +50,9 @@ def post_flushed_events(events)
         req.options.open_timeout = @config.connect_timeout
       end
       if res.status < 200 || res.status >= 300
-        @config.logger.error("[LDClient] Unexpected status code while processing events: #{res.status}")
+        @config.logger.error { "[LDClient] Unexpected status code while processing events: #{res.status}" }
         if res.status == 401
-          @config.logger.error("[LDClient] Received 401 error, no further events will be posted since SDK key is invalid")
+          @config.logger.error { "[LDClient] Received 401 error, no further events will be posted since SDK key is invalid" }
           stop
         end
       end
@@ -78,14 +78,14 @@ def add_event(event)
 
       if @queue.length < @config.capacity
         event[:creationDate] = (Time.now.to_f * 1000).to_i
-        @config.logger.debug("[LDClient] Enqueueing event: #{event.to_json}")
+        @config.logger.debug { "[LDClient] Enqueueing event: #{event.to_json}" }
         @queue.push(event)
 
         if !@worker.alive?
           @worker = create_worker
         end
       else
-        @config.logger.warn("[LDClient] Exceeded event queue capacity. Increase capacity to avoid dropping events.")
+        @config.logger.warn { "[LDClient] Exceeded event queue capacity. Increase capacity to avoid dropping events." }
       end
     end
 
diff --git a/lib/ldclient-rb/ldclient.rb b/lib/ldclient-rb/ldclient.rb
index 973b043c..2c91bd60 100644
--- a/lib/ldclient-rb/ldclient.rb
+++ b/lib/ldclient-rb/ldclient.rb
@@ -31,7 +31,7 @@ def initialize(sdk_key, config = Config.default, wait_for_sec = 5)
       @event_processor = EventProcessor.new(sdk_key, config)
 
       if @config.use_ldd?
-        @config.logger.info("[LDClient] Started LaunchDarkly Client in LDD mode")
+        @config.logger.info { "[LDClient] Started LaunchDarkly Client in LDD mode" }
         return  # requestor and update processor are not used in this mode
       end
 
@@ -41,8 +41,8 @@ def initialize(sdk_key, config = Config.default, wait_for_sec = 5)
         if @config.stream?
           @update_processor = StreamProcessor.new(sdk_key, config, requestor)
         else
-          @config.logger.info("Disabling streaming API")
-          @config.logger.warn("You should only disable the streaming API if instructed to do so by LaunchDarkly support")
+          @config.logger.info { "Disabling streaming API" }
+          @config.logger.warn { "You should only disable the streaming API if instructed to do so by LaunchDarkly support" }
           @update_processor = PollingProcessor.new(config, requestor)
         end
         @update_processor.start
@@ -54,7 +54,7 @@ def initialize(sdk_key, config = Config.default, wait_for_sec = 5)
             initialized?
           end
         rescue WaitUtil::TimeoutError
-          @config.logger.error("[LDClient] Timeout encountered waiting for LaunchDarkly client initialization")
+          @config.logger.error { "[LDClient] Timeout encountered waiting for LaunchDarkly client initialization" }
         end
       end
     end
@@ -64,7 +64,7 @@ def flush
     end
 
     def toggle?(key, user, default = False)
-      @config.logger.warn("[LDClient] toggle? is deprecated. Use variation instead")
+      @config.logger.warn { "[LDClient] toggle? is deprecated. Use variation instead" }
       variation(key, user, default)
     end
 
@@ -114,16 +114,16 @@ def variation(key, user, default)
       return default if @config.offline?
 
       unless user
-        @config.logger.error("[LDClient] Must specify user")
+        @config.logger.error { "[LDClient] Must specify user" }
         @event_processor.add_event(kind: "feature", key: key, value: default, default: default, user: user)
         return default
       end
 
       if !initialized?
         if @store.initialized?
-          @config.logger.warn("[LDClient] Client has not finished initializing; using last known values from feature store")
+          @config.logger.warn { "[LDClient] Client has not finished initializing; using last known values from feature store" }
         else
-          @config.logger.error("[LDClient] Client has not finished initializing; feature store unavailable, returning default value")
+          @config.logger.error { "[LDClient] Client has not finished initializing; feature store unavailable, returning default value" }
           @event_processor.add_event(kind: "feature", key: key, value: default, default: default, user: user)
           return default
         end
@@ -133,7 +133,7 @@ def variation(key, user, default)
       feature = @store.get(FEATURES, key)
 
       if feature.nil?
-        @config.logger.info("[LDClient] Unknown feature flag #{key}. Returning default value")
+        @config.logger.info { "[LDClient] Unknown feature flag #{key}. Returning default value" }
         @event_processor.add_event(kind: "feature", key: key, value: default, default: default, user: user)
         return default
       end
@@ -149,12 +149,12 @@ def variation(key, user, default)
           @event_processor.add_event(kind: "feature", key: key, user: user, value: res[:value], default: default, version: feature[:version])
           return res[:value]
         else
-          @config.logger.debug("[LDClient] Result value is null in toggle")
+          @config.logger.debug { "[LDClient] Result value is null in toggle" }
           @event_processor.add_event(kind: "feature", key: key, user: user, value: default, default: default, version: feature[:version])
           return default
         end
       rescue => exn
-        @config.logger.warn("[LDClient] Error evaluating feature flag: #{exn.inspect}. \nTrace: #{exn.backtrace}")
+        @config.logger.warn { "[LDClient] Error evaluating feature flag: #{exn.inspect}. \nTrace: #{exn.backtrace}" }
         @event_processor.add_event(kind: "feature", key: key, user: user, value: default, default: default, version: feature[:version])
         return default
       end
@@ -192,7 +192,7 @@ def all_flags(user)
       return Hash.new if @config.offline?
 
       unless user
-        @config.logger.error("[LDClient] Must specify user in all_flags")
+        @config.logger.error { "[LDClient] Must specify user in all_flags" }
         return Hash.new
       end
 
@@ -202,7 +202,7 @@ def all_flags(user)
         # TODO rescue if necessary
         Hash[features.map{ |k, f| [k, evaluate(f, user, @store)[:value]] }]
       rescue => exn
-        @config.logger.warn("[LDClient] Error evaluating all flags: #{exn.inspect}. \nTrace: #{exn.backtrace}")
+        @config.logger.warn { "[LDClient] Error evaluating all flags: #{exn.inspect}. \nTrace: #{exn.backtrace}" }
         return Hash.new
       end
     end
@@ -212,7 +212,7 @@ def all_flags(user)
     #
     # @return [void]
     def close
-      @config.logger.info("[LDClient] Closing LaunchDarkly client...")
+      @config.logger.info { "[LDClient] Closing LaunchDarkly client..." }
       if not @config.offline?
         @update_processor.stop
       end
@@ -223,7 +223,7 @@ def close
     def log_exception(caller, exn)
       error_traceback = "#{exn.inspect} #{exn}\n\t#{exn.backtrace.join("\n\t")}"
       error = "[LDClient] Unexpected exception in #{caller}: #{error_traceback}"
-      @config.logger.error(error)
+      @config.logger.error { error }
     end
 
     def sanitize_user(user)
diff --git a/lib/ldclient-rb/polling.rb b/lib/ldclient-rb/polling.rb
index 00cf5e8e..cc391bca 100644
--- a/lib/ldclient-rb/polling.rb
+++ b/lib/ldclient-rb/polling.rb
@@ -17,7 +17,7 @@ def initialized?
 
     def start
       return unless @started.make_true
-      @config.logger.info("[LDClient] Initializing polling connection")
+      @config.logger.info { "[LDClient] Initializing polling connection" }
       create_worker
     end
 
@@ -26,7 +26,7 @@ def stop
         if @worker && @worker.alive?
           @worker.raise "shutting down client"
         end
-        @config.logger.info("[LDClient] Polling connection stopped")
+        @config.logger.info { "[LDClient] Polling connection stopped" }
       end
     end
 
@@ -38,14 +38,14 @@ def poll
           SEGMENTS => all_data[:segments]
         })
         if @initialized.make_true
-          @config.logger.info("[LDClient] Polling connection initialized")
+          @config.logger.info { "[LDClient] Polling connection initialized" }
         end
       end
     end
 
     def create_worker
       @worker = Thread.new do
-        @config.logger.debug("[LDClient] Starting polling worker")
+        @config.logger.debug { "[LDClient] Starting polling worker" }
         while !@stopped.value do
           begin
             started_at = Time.now
@@ -55,10 +55,10 @@ def create_worker
               sleep(delta)
             end
           rescue InvalidSDKKeyError
-            @config.logger.error("[LDClient] Received 401 error, no further polling requests will be made since SDK key is invalid");
+            @config.logger.error { "[LDClient] Received 401 error, no further polling requests will be made since SDK key is invalid" };
             stop
           rescue StandardError => exn
-            @config.logger.error("[LDClient] Exception while polling: #{exn.inspect}")
+            @config.logger.error { "[LDClient] Exception while polling: #{exn.inspect}" }
             # TODO: log_exception(__method__.to_s, exn)
           end
         end
diff --git a/lib/ldclient-rb/redis_store.rb b/lib/ldclient-rb/redis_store.rb
index 2374eb23..ad2991f2 100644
--- a/lib/ldclient-rb/redis_store.rb
+++ b/lib/ldclient-rb/redis_store.rb
@@ -94,12 +94,12 @@ def self.default_prefix
     def get(kind, key)
       f = @cache[cache_key(kind, key)]
       if f.nil?
-        @logger.debug("RedisFeatureStore: no cache hit for #{key} in '#{kind[:namespace]}', requesting from Redis")
+        @logger.debug { "RedisFeatureStore: no cache hit for #{key} in '#{kind[:namespace]}', requesting from Redis" }
         f = with_connection do |redis|
           begin
             get_redis(kind, redis, key.to_sym)
           rescue => e
-            @logger.error("RedisFeatureStore: could not retrieve #{key} from Redis in '#{kind[:namespace]}', with error: #{e}")
+            @logger.error { "RedisFeatureStore: could not retrieve #{key} from Redis in '#{kind[:namespace]}', with error: #{e}" }
             nil
           end
         end
@@ -108,10 +108,10 @@ def get(kind, key)
         end
       end
       if f.nil?
-        @logger.debug("RedisFeatureStore: #{key} not found in '#{kind[:namespace]}'")
+        @logger.debug { "RedisFeatureStore: #{key} not found in '#{kind[:namespace]}'" }
         nil
       elsif f[:deleted]
-        @logger.debug("RedisFeatureStore: #{key} was deleted in '#{kind[:namespace]}', returning nil")
+        @logger.debug { "RedisFeatureStore: #{key} was deleted in '#{kind[:namespace]}', returning nil" }
         nil
       else
         f
@@ -124,7 +124,7 @@ def all(kind)
         begin
           hashfs = redis.hgetall(items_key(kind))
         rescue => e
-          @logger.error("RedisFeatureStore: could not retrieve all '#{kind[:namespace]}' items from Redis with error: #{e}; returning none")
+          @logger.error { "RedisFeatureStore: could not retrieve all '#{kind[:namespace]}' items from Redis with error: #{e}; returning none" }
           hashfs = {}
         end
         hashfs.each do |k, jsonItem|
@@ -169,7 +169,7 @@ def init(all_data)
         end
       end
       @inited.set(true)
-      @logger.info("RedisFeatureStore: initialized with #{count} items")
+      @logger.info { "RedisFeatureStore: initialized with #{count} items" }
     end
 
     def upsert(kind, item)
@@ -219,7 +219,7 @@ def get_redis(kind, redis, key)
         json_item = redis.hget(items_key(kind), key)
         JSON.parse(json_item, symbolize_names: true) if json_item
       rescue => e
-        @logger.error("RedisFeatureStore: could not retrieve #{key} from Redis, error: #{e}")
+        @logger.error { "RedisFeatureStore: could not retrieve #{key} from Redis, error: #{e}" }
         nil
       end
     end
@@ -232,7 +232,7 @@ def put_redis_and_cache(kind, redis, key, item)
       begin
         redis.hset(items_key(kind), key, item.to_json)
       rescue => e
-        @logger.error("RedisFeatureStore: could not store #{key} in Redis, error: #{e}")
+        @logger.error { "RedisFeatureStore: could not store #{key} in Redis, error: #{e}" }
       end
       put_cache(kind, key.to_sym, item)
     end
diff --git a/lib/ldclient-rb/requestor.rb b/lib/ldclient-rb/requestor.rb
index 27ce822e..abaab854 100644
--- a/lib/ldclient-rb/requestor.rb
+++ b/lib/ldclient-rb/requestor.rb
@@ -42,20 +42,20 @@ def make_request(path)
         end
       end
 
-      @config.logger.debug("[LDClient] Got response from uri: #{uri}\n\tstatus code: #{res.status}\n\theaders: #{res.headers}\n\tbody: #{res.body}")
+      @config.logger.debug { "[LDClient] Got response from uri: #{uri}\n\tstatus code: #{res.status}\n\theaders: #{res.headers}\n\tbody: #{res.body}" }
 
       if res.status == 401
-        @config.logger.error("[LDClient] Invalid SDK key")
+        @config.logger.error { "[LDClient] Invalid SDK key" }
         raise InvalidSDKKeyError
       end
 
       if res.status == 404
-        @config.logger.error("[LDClient] Resource not found")
+        @config.logger.error { "[LDClient] Resource not found" }
         return nil
       end
 
       if res.status < 200 || res.status >= 300
-        @config.logger.error("[LDClient] Unexpected status code #{res.status}")
+        @config.logger.error { "[LDClient] Unexpected status code #{res.status}" }
         return nil
       end
 
diff --git a/lib/ldclient-rb/stream.rb b/lib/ldclient-rb/stream.rb
index 1986abf7..4ec1052a 100644
--- a/lib/ldclient-rb/stream.rb
+++ b/lib/ldclient-rb/stream.rb
@@ -33,7 +33,7 @@ def initialized?
     def start
       return unless @started.make_true
 
-      @config.logger.info("[LDClient] Initializing stream connection")
+      @config.logger.info { "[LDClient] Initializing stream connection" }
       
       headers = 
       {
@@ -48,9 +48,9 @@ def start
         conn.on(INDIRECT_PUT) { |message| process_message(message, INDIRECT_PUT) }
         conn.on(INDIRECT_PATCH) { |message| process_message(message, INDIRECT_PATCH) }
         conn.on_error { |err|
-          @config.logger.error("[LDClient] Unexpected status code #{err[:status_code]} from streaming connection")
+          @config.logger.error { "[LDClient] Unexpected status code #{err[:status_code]} from streaming connection" }
           if err[:status_code] == 401
-            @config.logger.error("[LDClient] Received 401 error, no further streaming connection will be made since SDK key is invalid")
+            @config.logger.error { "[LDClient] Received 401 error, no further streaming connection will be made since SDK key is invalid" }
             stop
           end
         }
@@ -60,21 +60,21 @@ def start
     def stop
       if @stopped.make_true
         @es.close
-        @config.logger.info("[LDClient] Stream connection stopped")
+        @config.logger.info { "[LDClient] Stream connection stopped" }
       end
     end
 
     def stop
       if @stopped.make_true
         @es.close
-        @config.logger.info("[LDClient] Stream connection stopped")
+        @config.logger.info { "[LDClient] Stream connection stopped" }
       end
     end
 
     private
 
     def process_message(message, method)
-      @config.logger.debug("[LDClient] Stream received #{method} message: #{message.data}")
+      @config.logger.debug { "[LDClient] Stream received #{method} message: #{message.data}" }
       if method == PUT
         message = JSON.parse(message.data, symbolize_names: true)
         @feature_store.init({
@@ -82,7 +82,7 @@ def process_message(message, method)
           SEGMENTS => message[:data][:segments]
         })
         @initialized.make_true
-        @config.logger.info("[LDClient] Stream initialized")
+        @config.logger.info { "[LDClient] Stream initialized" }
       elsif method == PATCH
         message = JSON.parse(message.data, symbolize_names: true)
         for kind in [FEATURES, SEGMENTS]
@@ -108,7 +108,7 @@ def process_message(message, method)
           SEGMENTS => all_data[:segments]
         })
         @initialized.make_true
-        @config.logger.info("[LDClient] Stream initialized (via indirect message)")
+        @config.logger.info { "[LDClient] Stream initialized (via indirect message)" }
       elsif method == INDIRECT_PATCH
         key = key_for_path(FEATURES, message.data)
         if key
@@ -120,7 +120,7 @@ def process_message(message, method)
           end
         end
       else
-        @config.logger.warn("[LDClient] Unknown message received: #{method}")
+        @config.logger.warn { "[LDClient] Unknown message received: #{method}" }
       end
     end