diff --git a/rebar.config b/rebar.config
index 575352b..814f610 100644
--- a/rebar.config
+++ b/rebar.config
@@ -2,3 +2,18 @@
         {hackney, "1.12.1"},
         {exometer_core, "1.5.2"}
        ]}.
+
+{overrides, [
+    {override, exometer_core, [
+        % There is version conflict between parse_trans in certifi(comes with hackney)
+        % and parse_trans in exometer_core. We override dependencies for exometer_core 
+        % to have ability to publish exometer_core to hex.pm.
+        {deps, [
+            {lager, "~>3.5.0"},
+            {parse_trans, "~>3.2.0"}, % to have the same version with certifi
+            {folsom, "~>0.8.5"},
+            {setup, "~>1.8.2"},
+            {hut, "~>1.2.0"}
+        ]}
+    ]}
+]}.
diff --git a/rebar.lock b/rebar.lock
index 37d240f..82ceab2 100644
--- a/rebar.lock
+++ b/rebar.lock
@@ -1,8 +1,8 @@
 {"1.1.0",
-[{<<"bear">>,{pkg,<<"bear">>,<<"0.8.5">>},2},
+[{<<"bear">>,{pkg,<<"bear">>,<<"0.8.7">>},2},
  {<<"certifi">>,{pkg,<<"certifi">>,<<"2.3.1">>},1},
  {<<"exometer_core">>,{pkg,<<"exometer_core">>,<<"1.5.2">>},0},
- {<<"folsom">>,{pkg,<<"folsom">>,<<"0.8.5">>},1},
+ {<<"folsom">>,{pkg,<<"folsom">>,<<"0.8.7">>},1},
  {<<"goldrush">>,{pkg,<<"goldrush">>,<<"0.1.9">>},2},
  {<<"hackney">>,{pkg,<<"hackney">>,<<"1.12.1">>},0},
  {<<"hut">>,{pkg,<<"hut">>,<<"1.2.0">>},1},
@@ -10,16 +10,16 @@
  {<<"lager">>,{pkg,<<"lager">>,<<"3.5.2">>},1},
  {<<"metrics">>,{pkg,<<"metrics">>,<<"1.0.1">>},1},
  {<<"mimerl">>,{pkg,<<"mimerl">>,<<"1.0.2">>},1},
- {<<"parse_trans">>,{pkg,<<"parse_trans">>,<<"3.0.0">>},1},
+ {<<"parse_trans">>,{pkg,<<"parse_trans">>,<<"3.2.0">>},1},
  {<<"setup">>,{pkg,<<"setup">>,<<"1.8.4">>},1},
  {<<"ssl_verify_fun">>,{pkg,<<"ssl_verify_fun">>,<<"1.1.1">>},1},
  {<<"unicode_util_compat">>,{pkg,<<"unicode_util_compat">>,<<"0.3.1">>},2}]}.
 [
 {pkg_hash,[
- {<<"bear">>, <<"E95FCA1627CD9E15BAF93CE0A52AFF16917BAF325F0EE65B88CD715376CD2344">>},
+ {<<"bear">>, <<"16264309AE5D005D03718A5C82641FCC259C9E8F09ADEB6FD79CA4271168656F">>},
  {<<"certifi">>, <<"D0F424232390BF47D82DA8478022301C561CF6445B5B5FB6A84D49A9E76D2639">>},
  {<<"exometer_core">>, <<"62A99A361BA8A14D53857D4C716A191E810299D2F43C5C981EB7B086C0BFCCE1">>},
- {<<"folsom">>, <<"94A027B56FE84FEED264F9B33CB4C6AC9A801FAD84B87DBDA0836CE83C3B8D69">>},
+ {<<"folsom">>, <<"A885F0AEEE4C84270954C88A55A5A473D6B2C7493E32FFDC5765412DD555A951">>},
  {<<"goldrush">>, <<"F06E5D5F1277DA5C413E84D5A2924174182FB108DABB39D5EC548B27424CD106">>},
  {<<"hackney">>, <<"8BF2D0E11E722E533903FE126E14D6E7E94D9B7983CED595B75F532E04B7FDC7">>},
  {<<"hut">>, <<"0089DF0FAA2827C605BBADA88153F24FFF5EA7A4BE32ECF0250A7FDC2719CAFB">>},
@@ -27,7 +27,7 @@
  {<<"lager">>, <<"614A8C8F67BF99B69EB264EA22121AD25511C055AAEC09B086773D5108C6767F">>},
  {<<"metrics">>, <<"25F094DEA2CDA98213CECC3AEFF09E940299D950904393B2A29D191C346A8486">>},
  {<<"mimerl">>, <<"993F9B0E084083405ED8252B99460C4F0563E41729AB42D9074FD5E52439BE88">>},
- {<<"parse_trans">>, <<"9E96B1C9C3A0DF54E7B76F8F685D38BFA1EB21B31E042B1D1A5A70258E4DB1E3">>},
+ {<<"parse_trans">>, <<"2ADFA4DAF80C14DC36F522CF190EB5C4EE3E28008FC6394397C16F62A26258C2">>},
  {<<"setup">>, <<"738DB0685DC1741F45C6A9BF78478E0D5877F3D0876C0B50FD02F0210EDB5AA4">>},
  {<<"ssl_verify_fun">>, <<"28A4D65B7F59893BC2C7DE786DEC1E1555BD742D336043FE644AE956C3497FBE">>},
  {<<"unicode_util_compat">>, <<"A1F612A7B512638634A603C8F401892AFBF99B8CE93A45041F8AACA99CADB85E">>}]}