diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,22 @@
 # Changelog for hs-opentelemetry-exporter-otlp
 
+## Unreleased
+
+## 0.1.0.1
+
+### Added
+- TraceState support in OTLP span export
+- Proper encoding of traceState field in OTLP spans and span links
+- Full traceState preservation without HTTP header constraints
+
+### Changed
+- Span export now includes traceState information from span context
+- Span links export now includes traceState information from link context
+- Switched to `encodeTraceStateFull` to preserve all traceState entries in binary format
+
+### Dependencies
+- Added `hs-opentelemetry-propagator-w3c` dependency for traceState encoding
+
 ## 0.1.0.0
 
 - Export dropped span, link, event, and attribute counts
diff --git a/hs-opentelemetry-exporter-otlp.cabal b/hs-opentelemetry-exporter-otlp.cabal
--- a/hs-opentelemetry-exporter-otlp.cabal
+++ b/hs-opentelemetry-exporter-otlp.cabal
@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.36.0.
+-- This file has been generated from package.yaml by hpack version 0.37.0.
 --
 -- see: https://github.com/sol/hpack
 
 name:           hs-opentelemetry-exporter-otlp
-version:        0.1.0.0
+version:        0.1.0.1
 synopsis:       OpenTelemetry exporter supporting the standard OTLP protocol
 description:    Please see the README on GitHub at <https://github.com/iand675/hs-opentelemetry/tree/main/exporters/otlp#readme>
 category:       OpenTelemetry, Telemetry, Monitoring, Observability, Metrics
@@ -39,8 +39,9 @@
       base >=4.7 && <5
     , bytestring
     , case-insensitive
-    , hs-opentelemetry-api ==0.2.*
+    , hs-opentelemetry-api ==0.3.*
     , hs-opentelemetry-otlp ==0.1.*
+    , hs-opentelemetry-propagator-w3c
     , http-client
     , http-conduit
     , http-types
diff --git a/src/OpenTelemetry/Exporter/OTLP/Span.hs b/src/OpenTelemetry/Exporter/OTLP/Span.hs
--- a/src/OpenTelemetry/Exporter/OTLP/Span.hs
+++ b/src/OpenTelemetry/Exporter/OTLP/Span.hs
@@ -74,6 +74,7 @@
 import qualified OpenTelemetry.Baggage as Baggage
 import OpenTelemetry.Environment
 import OpenTelemetry.Exporter.Span
+import OpenTelemetry.Propagator.W3CTraceContext (encodeTraceStateFull)
 import OpenTelemetry.Resource
 import OpenTelemetry.Trace.Core (timestampNanoseconds)
 import qualified OpenTelemetry.Trace.Core as OT
@@ -318,7 +319,7 @@
     . fmap attributeToKeyValue
     . H.toList
     . snd
-    . getAttributes
+    . ((,) <$> getCount <*> getAttributeMap)
   where
     primAttributeToAnyValue = \case
       TextAttribute t -> defMessage & Common_Fields.stringValue .~ t
@@ -406,7 +407,7 @@
       & Trace_Fields.spanId
         .~ spanIdBytes (OT.spanId $ OT.spanContext completedSpan)
       & Trace_Fields.traceState
-        .~ "" -- TODO (_ $ OT.traceState $ OT.spanContext completedSpan)
+        .~ T.decodeUtf8 (encodeTraceStateFull $ OT.traceState $ OT.spanContext completedSpan)
       & Trace_Fields.name
         .~ OT.spanName completedSpan
       & Trace_Fields.kind
@@ -424,7 +425,7 @@
       & Trace_Fields.vec'attributes
         .~ attributesToProto (OT.spanAttributes completedSpan)
       & Trace_Fields.droppedAttributesCount
-        .~ fromIntegral (fst (getAttributes $ OT.spanAttributes completedSpan))
+        .~ fromIntegral (getCount $ OT.spanAttributes completedSpan)
       & Trace_Fields.vec'events
         .~ fmap makeEvent (appendOnlyBoundedCollectionValues $ OT.spanEvents completedSpan)
       & Trace_Fields.droppedEventsCount
@@ -463,7 +464,7 @@
     & Trace_Fields.vec'attributes
       .~ attributesToProto (OT.eventAttributes e)
     & Trace_Fields.droppedAttributesCount
-      .~ fromIntegral (fst (getAttributes $ OT.eventAttributes e))
+      .~ fromIntegral (getCount $ OT.eventAttributes e)
 
 
 makeLink :: OT.Link -> Span'Link
@@ -473,7 +474,9 @@
       .~ traceIdBytes (OT.traceId $ OT.frozenLinkContext l)
     & Trace_Fields.spanId
       .~ spanIdBytes (OT.spanId $ OT.frozenLinkContext l)
+    & Trace_Fields.traceState
+      .~ T.decodeUtf8 (encodeTraceStateFull $ OT.traceState $ OT.frozenLinkContext l)
     & Trace_Fields.vec'attributes
       .~ attributesToProto (OT.frozenLinkAttributes l)
     & Trace_Fields.droppedAttributesCount
-      .~ fromIntegral (fst (getAttributes $ OT.frozenLinkAttributes l))
+      .~ fromIntegral (getCount $ OT.frozenLinkAttributes l)