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
@@ -1,22 +1,22 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.34.5.
+-- This file has been generated from package.yaml by hpack version 0.35.2.
 --
 -- see: https://github.com/sol/hpack
 
-name:           hs-opentelemetry-exporter-otlp
-version:        0.0.1.4
-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
-homepage:       https://github.com/iand675/hs-opentelemetry#readme
-bug-reports:    https://github.com/iand675/hs-opentelemetry/issues
-author:         Ian Duncan
-maintainer:     ian@iankduncan.com
-copyright:      2021 Ian Duncan
-license:        BSD3
-license-file:   LICENSE
-build-type:     Simple
+name:               hs-opentelemetry-exporter-otlp
+version:            0.0.1.5
+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
+homepage:           https://github.com/iand675/hs-opentelemetry#readme
+bug-reports:        https://github.com/iand675/hs-opentelemetry/issues
+author:             Ian Duncan
+maintainer:         ian@iankduncan.com
+copyright:          2021 Ian Duncan
+license:            BSD3
+license-file:       LICENSE
+build-type:         Simple
 extra-source-files:
     README.md
     ChangeLog.md
@@ -38,7 +38,7 @@
     , bytestring
     , case-insensitive
     , clock
-    , hs-opentelemetry-api ==0.0.3.*
+    , hs-opentelemetry-api >=0.0.3 && <0.2
     , hs-opentelemetry-otlp ==0.0.1.*
     , http-client
     , http-conduit
@@ -66,7 +66,7 @@
     , bytestring
     , case-insensitive
     , clock
-    , hs-opentelemetry-api ==0.0.3.*
+    , hs-opentelemetry-api >=0.0.3 && <0.2
     , hs-opentelemetry-exporter-otlp
     , hs-opentelemetry-otlp ==0.0.1.*
     , http-client
diff --git a/src/OpenTelemetry/Exporter/OTLP.hs b/src/OpenTelemetry/Exporter/OTLP.hs
--- a/src/OpenTelemetry/Exporter/OTLP.hs
+++ b/src/OpenTelemetry/Exporter/OTLP.hs
@@ -128,7 +128,7 @@
   }
 
 
-loadExporterEnvironmentVariables :: MonadIO m => m OTLPExporterConfig
+loadExporterEnvironmentVariables :: (MonadIO m) => m OTLPExporterConfig
 loadExporterEnvironmentVariables = liftIO $ do
   OTLPExporterConfig
     <$> lookupEnv "OTEL_EXPORTER_OTLP_ENDPOINT"
@@ -328,7 +328,7 @@
              )
 
 
-immutableSpansToProtobuf :: MonadIO m => HashMap OT.InstrumentationLibrary (Vector OT.ImmutableSpan) -> m ExportTraceServiceRequest
+immutableSpansToProtobuf :: (MonadIO m) => HashMap OT.InstrumentationLibrary (Vector OT.ImmutableSpan) -> m ExportTraceServiceRequest
 immutableSpansToProtobuf completedSpans = do
   spansByLibrary <- mapM makeInstrumentationLibrarySpans spanGroupList
   pure $
@@ -356,7 +356,7 @@
 
     spanGroupList = H.toList completedSpans
 
-    makeInstrumentationLibrarySpans :: MonadIO m => (OT.InstrumentationLibrary, Vector OT.ImmutableSpan) -> m InstrumentationLibrarySpans
+    makeInstrumentationLibrarySpans :: (MonadIO m) => (OT.InstrumentationLibrary, Vector OT.ImmutableSpan) -> m InstrumentationLibrarySpans
     makeInstrumentationLibrarySpans (library, completedSpans_) = do
       spans_ <- mapM makeSpan completedSpans_
       pure $
@@ -371,7 +371,7 @@
 
 -- & schemaUrl .~ "" -- TODO
 
-makeSpan :: MonadIO m => OT.ImmutableSpan -> m Span
+makeSpan :: (MonadIO m) => OT.ImmutableSpan -> m Span
 makeSpan completedSpan = do
   let startTime = timestampNanoseconds (OT.spanStart completedSpan)
   parentSpanF <- do