diff --git a/.github/workflows/test-stable.yml b/.github/workflows/test-stable.yml
index 9ac8406..df7b955 100644
--- a/.github/workflows/test-stable.yml
+++ b/.github/workflows/test-stable.yml
@@ -184,7 +184,7 @@ jobs:
       uses: actions/checkout@v2
       with:
         path: inspircd
-        ref: v3.12.0
+        ref: v3.15.0
         repository: inspircd/inspircd
     - name: Build InspIRCd
       run: |
diff --git a/irctest/server_tests/whowas.py b/irctest/server_tests/whowas.py
index f193595..5b5d926 100644
--- a/irctest/server_tests/whowas.py
+++ b/irctest/server_tests/whowas.py
@@ -201,10 +201,6 @@ class WhowasTestCase(cases.BaseServerTestCase):
         )
 
     @cases.mark_specifications("RFC1459", "RFC2812", "Modern")
-    @cases.xfailIfSoftware(
-        ["InspIRCd"],
-        "Feature not released yet: https://github.com/inspircd/inspircd/pull/1967",
-    )
     def testWhowasMultiple(self):
         """
         "The history is searched backward, returning the most recent entry first."
@@ -215,10 +211,6 @@ class WhowasTestCase(cases.BaseServerTestCase):
         self._testWhowasMultiple(second_result=True, whowas_command="WHOWAS nick2")
 
     @cases.mark_specifications("RFC1459", "RFC2812", "Modern")
-    @cases.xfailIfSoftware(
-        ["InspIRCd"],
-        "Feature not released yet: https://github.com/inspircd/inspircd/pull/1968",
-    )
     def testWhowasCount1(self):
         """
         "If there are multiple entries, up to <count> replies will be returned"
@@ -229,10 +221,6 @@ class WhowasTestCase(cases.BaseServerTestCase):
         self._testWhowasMultiple(second_result=False, whowas_command="WHOWAS nick2 1")
 
     @cases.mark_specifications("RFC1459", "RFC2812", "Modern")
-    @cases.xfailIfSoftware(
-        ["InspIRCd"],
-        "Feature not released yet: https://github.com/inspircd/inspircd/pull/1968",
-    )
     def testWhowasCount2(self):
         """
         "If there are multiple entries, up to <count> replies will be returned"
@@ -243,10 +231,6 @@ class WhowasTestCase(cases.BaseServerTestCase):
         self._testWhowasMultiple(second_result=True, whowas_command="WHOWAS nick2 2")
 
     @cases.mark_specifications("RFC1459", "RFC2812", "Modern")
-    @cases.xfailIfSoftware(
-        ["InspIRCd"],
-        "Feature not released yet: https://github.com/inspircd/inspircd/pull/1968",
-    )
     def testWhowasCountNegative(self):
         """
         "If a non-positive number is passed as being <count>, then a full search
@@ -264,10 +248,6 @@ class WhowasTestCase(cases.BaseServerTestCase):
     @cases.xfailIfSoftware(
         ["ircu2"], "Fix not released yet: https://github.com/UndernetIRC/ircu2/pull/19"
     )
-    @cases.xfailIfSoftware(
-        ["InspIRCd"],
-        "Feature not released yet: https://github.com/inspircd/inspircd/pull/1967",
-    )
     def testWhowasCountZero(self):
         """
         "If a non-positive number is passed as being <count>, then a full search
diff --git a/workflows.yml b/workflows.yml
index 9b66fc3..ee2b358 100644
--- a/workflows.yml
+++ b/workflows.yml
@@ -143,7 +143,7 @@ software:
         name: InspIRCd
         repository: inspircd/inspircd
         refs: &inspircd_refs
-            stable: v3.12.0
+            stable: v3.15.0
             release: null
             devel: master
             devel_release: insp3