diff --git a/cpt_fix_sixpack/gff3_fix_sixpack.xml b/cpt_fix_sixpack/gff3_fix_sixpack.xml
index b547e64..bde3e8b 100755
--- a/cpt_fix_sixpack/gff3_fix_sixpack.xml
+++ b/cpt_fix_sixpack/gff3_fix_sixpack.xml
@@ -4,7 +4,11 @@
     <import>macros.xml</import>
     <import>cpt-macros.xml</import>
   </macros>
-  <expand macro="requirements"/>
+  <expand macro="requirements">
+    <requirement type="package" version="3.9.16">python</requirement>
+    <requirement type="package" version="1.2.2">cpt_gffparser</requirement>
+    <requirement type="package" version="1.81">biopython</requirement>
+  </expand>
   <command detect_errors="aggressive"><![CDATA[
 '$__tool_directory__/gff3_fix_sixpack.py'
 @INPUT_GFF@
diff --git a/cpt_req_phage_start/gff3_require_phage_start.xml b/cpt_req_phage_start/gff3_require_phage_start.xml
index 2193c57..8203006 100755
--- a/cpt_req_phage_start/gff3_require_phage_start.xml
+++ b/cpt_req_phage_start/gff3_require_phage_start.xml
@@ -4,7 +4,11 @@
     <import>macros.xml</import>
     <import>cpt-macros.xml</import>
   </macros>
-  <expand macro="requirements"/>
+  <expand macro="requirements">
+    <requirement type="package" version="3.9.16">python</requirement>
+    <requirement type="package" version="1.2.2">cpt_gffparser</requirement>
+    <requirement type="package" version="1.81">biopython</requirement>
+  </expand>
   <command detect_errors="aggressive"><![CDATA[
 @GENOME_SELECTOR_PRE@
 
diff --git a/gff3/gff3_fix_sixpack.xml b/gff3/gff3_fix_sixpack.xml
index b547e64..bde3e8b 100755
--- a/gff3/gff3_fix_sixpack.xml
+++ b/gff3/gff3_fix_sixpack.xml
@@ -4,7 +4,11 @@
     <import>macros.xml</import>
     <import>cpt-macros.xml</import>
   </macros>
-  <expand macro="requirements"/>
+  <expand macro="requirements">
+    <requirement type="package" version="3.9.16">python</requirement>
+    <requirement type="package" version="1.2.2">cpt_gffparser</requirement>
+    <requirement type="package" version="1.81">biopython</requirement>
+  </expand>
   <command detect_errors="aggressive"><![CDATA[
 '$__tool_directory__/gff3_fix_sixpack.py'
 @INPUT_GFF@