diff --git a/tests/spec/access_token_access_spec.lua b/tests/spec/access_token_access_spec.lua
index 87128e3..bd2347b 100644
--- a/tests/spec/access_token_access_spec.lua
+++ b/tests/spec/access_token_access_spec.lua
@@ -202,7 +202,7 @@ describe("when token endpoint is not reachable", function()
     access_token_opts = {
       timeout = 40000,
       discovery = {
-        token_endpoint = "http://192.0.2.1/"
+        token_endpoint = "http://127.1.2.3/"
       }
     },
     token_response_expires_in = 0
@@ -219,7 +219,7 @@ describe("when token endpoint is not reachable", function()
     assert.are.equals(401, status)
   end)
   it("an error has been logged", function()
-    assert.error_log_contains("access_token error: accessing token endpoint.*%(http://192.0.2.1/%) failed")
+    assert.error_log_contains("access_token error: accessing token endpoint.*%(http://127.1.2.3/%) failed")
   end)
 end)
 
diff --git a/tests/spec/bearer_token_verification_spec.lua b/tests/spec/bearer_token_verification_spec.lua
index 7834aca..6d1c67d 100644
--- a/tests/spec/bearer_token_verification_spec.lua
+++ b/tests/spec/bearer_token_verification_spec.lua
@@ -464,7 +464,7 @@ describe("when jwks endpoint is not reachable", function()
     verify_opts = {
       timeout = 40000,
       discovery = {
-        jwks_uri = "http://192.0.2.1/"
+        jwks_uri = "http://127.1.2.3/"
       }
     },
   })
@@ -478,7 +478,7 @@ describe("when jwks endpoint is not reachable", function()
     assert.are.equals(401, status)
   end)
   it("an error has been logged", function()
-    assert.error_log_contains("Invalid token: accessing jwks url.*%(http://192.0.2.1/%) failed")
+    assert.error_log_contains("Invalid token: accessing jwks url.*%(http://127.1.2.3/%) failed")
   end)
 end)
 
diff --git a/tests/spec/introspection_spec.lua b/tests/spec/introspection_spec.lua
index 3b5437b..a22a3b8 100644
--- a/tests/spec/introspection_spec.lua
+++ b/tests/spec/introspection_spec.lua
@@ -396,7 +396,7 @@ describe("when introspection endpoint is not reachable", function()
   test_support.start_server({
     introspection_opts = {
       timeout = 40000,
-      introspection_endpoint = "http://192.0.2.1/"
+      introspection_endpoint = "http://127.1.2.3/"
     },
   })
   teardown(test_support.stop_server)
@@ -409,7 +409,7 @@ describe("when introspection endpoint is not reachable", function()
     assert.are.equals(401, status)
   end)
   it("an error has been logged", function()
-    assert.error_log_contains("Introspection error:.*accessing introspection endpoint %(http://192.0.2.1/%) failed")
+    assert.error_log_contains("Introspection error:.*accessing introspection endpoint %(http://127.1.2.3/%) failed")
   end)
 end)
 
diff --git a/tests/spec/redirect_to_op_spec.lua b/tests/spec/redirect_to_op_spec.lua
index efadd72..0525782 100644
--- a/tests/spec/redirect_to_op_spec.lua
+++ b/tests/spec/redirect_to_op_spec.lua
@@ -136,7 +136,7 @@ describe("when discovery endpoint is not reachable", function()
   test_support.start_server({
     oidc_opts = {
       timeout = 40000,
-      discovery = "http://192.0.2.1/"
+      discovery = "http://127.1.2.3/"
     },
   })
   teardown(test_support.stop_server)
@@ -148,7 +148,7 @@ describe("when discovery endpoint is not reachable", function()
     assert.are.equals(401, status)
   end)
   it("an error has been logged", function()
-    assert.error_log_contains("authenticate failed: accessing discovery url.*%(http://192.0.2.1/%) failed")
+    assert.error_log_contains("authenticate failed: accessing discovery url.*%(http://127.1.2.3/%) failed")
   end)
 end)
 
diff --git a/tests/spec/test_support.lua b/tests/spec/test_support.lua
index fb1d229..3a85fcf 100644
--- a/tests/spec/test_support.lua
+++ b/tests/spec/test_support.lua
@@ -160,7 +160,7 @@ http {
     server {
         log_subrequest on;
 
-        listen      80;
+        listen      127.0.0.1:80;
         #listen     443 ssl;
         #ssl_certificate     certificate-chain.crt;
         #ssl_certificate_key private.key;
diff --git a/tests/spec/token_request_spec.lua b/tests/spec/token_request_spec.lua
index a7dfd50..08b49fb 100644
--- a/tests/spec/token_request_spec.lua
+++ b/tests/spec/token_request_spec.lua
@@ -153,7 +153,7 @@ describe("if token endpoint is not reachable", function()
     oidc_opts = {
       timeout = 40000,
       discovery = {
-        token_endpoint = "http://192.0.2.1/"
+        token_endpoint = "http://127.1.2.3/"
       }
     },
   })
@@ -163,7 +163,7 @@ describe("if token endpoint is not reachable", function()
     assert.are.equals(401, status)
   end)
   it("an error has been logged", function()
-    assert.error_log_contains("authenticate failed:.*accessing token endpoint %(http://192.0.2.1/%) failed")
+    assert.error_log_contains("authenticate failed:.*accessing token endpoint %(http://127.1.2.3/%) failed")
   end)
 end)
 
diff --git a/tests/spec/userinfo_spec.lua b/tests/spec/userinfo_spec.lua
index 800a84a..67cb6d2 100644
--- a/tests/spec/userinfo_spec.lua
+++ b/tests/spec/userinfo_spec.lua
@@ -75,7 +75,7 @@ describe("when userinfo endpoint is not reachable", function()
     oidc_opts = {
       timeout = 40000,
       discovery = {
-        userinfo_endpoint = "http://192.0.2.1/"
+        userinfo_endpoint = "http://127.1.2.3/"
       }
     },
   })
@@ -85,7 +85,7 @@ describe("when userinfo endpoint is not reachable", function()
     assert.are.equals(302, status)
   end)
   it("an error has been logged", function()
-    assert.error_log_contains(".*error calling userinfo endpoint: accessing %(http://192.0.2.1/%) failed")
+    assert.error_log_contains(".*error calling userinfo endpoint: accessing %(http://127.1.2.3/%) failed")
   end)
 end)