diff --git a/share/install_gems/AlmaLinux8/Gemfile.lock b/share/install_gems/AlmaLinux8/Gemfile.lock
index 8b5e1c49bd..8dd43efe8a 100644
--- a/share/install_gems/AlmaLinux8/Gemfile.lock
+++ b/share/install_gems/AlmaLinux8/Gemfile.lock
@@ -194,7 +194,9 @@ GEM
       polyglot (~> 0.3)
     tzinfo (1.2.11)
       thread_safe (~> 0.1)
-    unf (0.2.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.9.1)
     uuidtools (2.2.0)
     vsphere-automation-cis (0.4.7)
       vsphere-automation-runtime (~> 0.4.6)
@@ -269,6 +271,7 @@ DEPENDENCIES
   sqlite3 (<= 1.6.9)
   thin
   treetop (>= 1.6.3)
+  unf (< 0.2.0)
   uuidtools
   vsphere-automation-cis (~> 0.4.6)
   vsphere-automation-vcenter (~> 0.4.6)
diff --git a/share/install_gems/Gemfile b/share/install_gems/Gemfile
index 22a15b4205..990363f01a 100644
--- a/share/install_gems/Gemfile
+++ b/share/install_gems/Gemfile
@@ -39,6 +39,10 @@ if ruby_version >= Gem::Version.new('3.0.0')
     gem 'rexml'
 end
 
+if ruby_version < Gem::Version.new('2.6.0')
+    gem 'unf', '< 0.2.0'
+end
+
 ################################################################################
 # gems groups
 ################################################################################
diff --git a/share/install_gems/RedHat8/Gemfile.lock b/share/install_gems/RedHat8/Gemfile.lock
index d7781e5df0..d1f60df660 100644
--- a/share/install_gems/RedHat8/Gemfile.lock
+++ b/share/install_gems/RedHat8/Gemfile.lock
@@ -194,7 +194,9 @@ GEM
       polyglot (~> 0.3)
     tzinfo (1.2.11)
       thread_safe (~> 0.1)
-    unf (0.2.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.9.1)
     uuidtools (2.2.0)
     vsphere-automation-cis (0.4.7)
       vsphere-automation-runtime (~> 0.4.6)
@@ -269,6 +271,7 @@ DEPENDENCIES
   sqlite3 (<= 1.6.9)
   thin
   treetop (>= 1.6.3)
+  unf (< 0.2.0)
   uuidtools
   vsphere-automation-cis (~> 0.4.6)
   vsphere-automation-vcenter (~> 0.4.6)