diff --git a/client/Makefile b/client/Makefile
index 895f39f..7c4da43 100644
--- a/client/Makefile
+++ b/client/Makefile
@@ -8,6 +8,11 @@ SED = sed
 ERB = erb
 REPLACEMENTS = -i 's/$(EXTVERSION)/$(NEW_VERSION)/g'
 NEW_EXTENSION_ARTIFACT = $(EXTENSION)--$(EXTVERSION).sql
+AWK = awk
+
+# Parallel support macros
+PG_CONFIG         = pg_config
+PG_PARALLEL      := $(shell $(PG_CONFIG) --version | ($(AWK) '{$$2*=1000; if ($$2 >= 9600) print 1; else print 0;}' 2> /dev/null || echo 0))
 
 # OLD_VERSIONS = $(wildcard old_versions/*.sql)
 # DATA =  $(NEW_EXTENSION_ARTIFACT) \
@@ -50,6 +55,13 @@ SOURCES_DATA = $(wildcard $(SOURCES_DATA_DIR)/*.sql) $(GENERATED_SQL_FILES)
 $(NEW_EXTENSION_ARTIFACT): $(SOURCES_DATA)
 	rm -f $@
 	cat $(SOURCES_DATA_DIR)/*.sql >> $@
+ifeq ($(PG_PARALLEL), 0)
+# Remove PARALLEL in aggregates and functions
+	$(eval TMPFILE := $(shell mktemp /tmp/$(basename $0).XXXXXXXX))
+	$(SED) -e 's/PARALLEL \= [A-Z]*,/''/g' \
+		-e 's/PARALLEL [A-Z]*/''/g' $@ > $(TMPFILE)
+	mv $(TMPFILE) $@
+endif
 
 .PHONY: all
 all: $(DATA)
@@ -61,6 +73,13 @@ release: $(EXTENSION).control $(SOURCES_DATA)
 	$(SED) $(REPLACEMENTS) $(EXTENSION).control
 	git add $(EXTENSION).control
 	cat $(SOURCES_DATA_DIR)/*.sql > $(EXTENSION)--$(NEW_VERSION).sql
+ifeq ($(PG_PARALLEL), 0)
+# Remove PARALLEL in aggregates and functions
+	$(eval TMPFILE := $(shell mktemp /tmp/$(basename $0).XXXXXXXX))
+	$(SED) -e 's/PARALLEL \= [A-Z]*,/''/g' \
+		-e 's/PARALLEL [A-Z]*/''/g' $@ > $(TMPFILE)
+	mv $(TMPFILE) $@
+endif
 	git add $(EXTENSION)--$(NEW_VERSION).sql
 	$(ERB) version=$(NEW_VERSION) upgrade_downgrade_template.erb > $(EXTENSION)--$(EXTVERSION)--$(NEW_VERSION).sql
 	$(ERB) version=$(EXTVERSION) upgrade_downgrade_template.erb > $(EXTENSION)--$(NEW_VERSION)--$(EXTVERSION).sql
diff --git a/client/sql/10_geocoder_server_conn.sql b/client/sql/10_geocoder_server_conn.sql
index d180ab6..cf1b2f5 100644
--- a/client/sql/10_geocoder_server_conn.sql
+++ b/client/sql/10_geocoder_server_conn.sql
@@ -13,4 +13,4 @@ BEGIN
   SELECT trim(both '"' FROM db_connection_str) INTO db_connection_str;
   RETURN db_connection_str;
 END;
-$$ LANGUAGE 'plpgsql';
\ No newline at end of file
+$$ LANGUAGE 'plpgsql' STABLE PARALLEL SAFE;
diff --git a/client/sql/15_config_management.sql b/client/sql/15_config_management.sql
index 6a27cf6..16c8188 100644
--- a/client/sql/15_config_management.sql
+++ b/client/sql/15_config_management.sql
@@ -34,4 +34,4 @@ BEGIN
     result.organization_name = organization_name;
     RETURN result;
 END;
-$$ LANGUAGE 'plpgsql' SECURITY DEFINER;
\ No newline at end of file
+$$ LANGUAGE 'plpgsql' SECURITY DEFINER STABLE PARALLEL SAFE;
diff --git a/client/sql/20_table_augmentation.sql b/client/sql/20_table_augmentation.sql
index fb69387..18f0d77 100644
--- a/client/sql/20_table_augmentation.sql
+++ b/client/sql/20_table_augmentation.sql
@@ -41,7 +41,7 @@ BEGIN
 
   RETURN result;
 END;
-$$ LANGUAGE 'plpgsql' SECURITY DEFINER;
+$$ LANGUAGE 'plpgsql' SECURITY DEFINER VOLATILE PARALLEL UNSAFE;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_PopulateTableOBS_GetMeasure(
     table_name text,
@@ -89,7 +89,7 @@ BEGIN
 
   RETURN result;
 END;
-$$ LANGUAGE 'plpgsql' SECURITY DEFINER;
+$$ LANGUAGE 'plpgsql' SECURITY DEFINER VOLATILE PARALLEL UNSAFE;
 
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client.__DST_PrepareTableOBS_GetMeasure(
@@ -134,7 +134,7 @@ CREATE OR REPLACE FUNCTION cdb_dataservices_client.__DST_PrepareTableOBS_GetMeas
         )
 
     return True
-$$ LANGUAGE plpythonu;
+$$ LANGUAGE plpythonu VOLATILE PARALLEL UNSAFE;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client.__DST_PopulateTableOBS_GetMeasure(
     username text,
@@ -227,7 +227,7 @@ CREATE OR REPLACE FUNCTION cdb_dataservices_client.__DST_PopulateTableOBS_GetMea
             fdw_server=plpy.quote_literal(server_name)))
 
     return True
-$$ LANGUAGE plpythonu;
+$$ LANGUAGE plpythonu VOLATILE PARALLEL UNSAFE;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_ConnectUserTable(
     username text,
@@ -239,7 +239,7 @@ CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_ConnectUserTable(
 )RETURNS cdb_dataservices_client.ds_fdw_metadata AS $$
     CONNECT cdb_dataservices_client._server_conn_str();
     TARGET cdb_dataservices_server._DST_ConnectUserTable;
-$$ LANGUAGE plproxy;
+$$ LANGUAGE plproxy VOLATILE PARALLEL UNSAFE;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_GetReturnMetadata(
     username text,
@@ -249,7 +249,7 @@ CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_GetReturnMetadata(
 ) RETURNS cdb_dataservices_client.ds_return_metadata AS $$
     CONNECT cdb_dataservices_client._server_conn_str();
     TARGET cdb_dataservices_server._DST_GetReturnMetadata;
-$$ LANGUAGE plproxy;
+$$ LANGUAGE plproxy VOLATILE PARALLEL UNSAFE;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_FetchJoinFdwTableData(
     username text,
@@ -261,7 +261,7 @@ CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_FetchJoinFdwTableData(
 ) RETURNS SETOF record AS $$
     CONNECT cdb_dataservices_client._server_conn_str();
     TARGET cdb_dataservices_server._DST_FetchJoinFdwTableData;
-$$ LANGUAGE plproxy;
+$$ LANGUAGE plproxy VOLATILE PARALLEL UNSAFE;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_DisconnectUserTable(
     username text,
@@ -272,4 +272,4 @@ CREATE OR REPLACE FUNCTION cdb_dataservices_client._DST_DisconnectUserTable(
 ) RETURNS boolean AS $$
     CONNECT cdb_dataservices_client._server_conn_str();
     TARGET cdb_dataservices_server._DST_DisconnectUserTable;
-$$ LANGUAGE plproxy;
+$$ LANGUAGE plproxy VOLATILE PARALLEL UNSAFE;
diff --git a/client/sql/35_precheck_functions.sql b/client/sql/35_precheck_functions.sql
index c238a6a..92f4520 100644
--- a/client/sql/35_precheck_functions.sql
+++ b/client/sql/35_precheck_functions.sql
@@ -51,4 +51,4 @@ BEGIN
 
     RETURN TRUE;
 END;
-$$ LANGUAGE 'plpgsql';
+$$ LANGUAGE 'plpgsql' VOLATILE PARALLEL UNSAFE;