diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 2c5f249..3c6efe8 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -2,17 +2,17 @@ name: Build Test Coverage
 on: [push, pull_request]
 jobs:
   run:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     env:
-      OS: ubuntu-latest
-      PYTHON: '3.6.8'
+      OS: ubuntu-20.04
+      PYTHON: '3.8.10'
     steps:
     - name: Checkout
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v3
     - name: Setup Python
-      uses: actions/setup-python@v2.2.2
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.6.8
+        python-version: 3.8.10
     - name: Generate Report
       run: |
         pip install -r requirements.txt
diff --git a/cocoasm/instruction.py b/cocoasm/instruction.py
index 714b74b..7f9255d 100644
--- a/cocoasm/instruction.py
+++ b/cocoasm/instruction.py
@@ -147,9 +147,9 @@ class Instruction(NamedTuple):
     Instruction(mnemonic="ORB", mode=Mode(imm=0xCA, imm_sz=2, dir=0xDA, dir_sz=2, ind=0xEA, ind_sz=2, ext=0xFA, ext_sz=3)),
     Instruction(mnemonic="ORCC", mode=Mode(imm=0x1A, imm_sz=2)),
     Instruction(mnemonic="PSHS", mode=Mode(imm=0x34, imm_sz=2), is_special=True),
-    Instruction(mnemonic="PSHU", mode=Mode(imm=0x36, imm_sz=2)),
+    Instruction(mnemonic="PSHU", mode=Mode(imm=0x36, imm_sz=2), is_special=True),
     Instruction(mnemonic="PULS", mode=Mode(imm=0x35, imm_sz=2), is_special=True),
-    Instruction(mnemonic="PULU", mode=Mode(imm=0x37, imm_sz=2)),
+    Instruction(mnemonic="PULU", mode=Mode(imm=0x37, imm_sz=2), is_special=True),
     Instruction(mnemonic="ROLA", mode=Mode(inh=0x49, inh_sz=1)),
     Instruction(mnemonic="ROLB", mode=Mode(inh=0x59, inh_sz=1)),
     Instruction(mnemonic="ROL", mode=Mode(dir=0x09, dir_sz=2, ind=0x69, ind_sz=2, ext=0x79, ext_sz=3)),
diff --git a/cocoasm/operands.py b/cocoasm/operands.py
index 02d0c4b..36058c6 100644
--- a/cocoasm/operands.py
+++ b/cocoasm/operands.py
@@ -258,7 +258,7 @@ def resolve_symbols(self, symbol_table):
     def translate(self):
         post_byte = 0x00
 
-        if self.instruction.mnemonic == "PSHS" or self.instruction.mnemonic == "PULS":
+        if self.instruction.mnemonic in ["PSHS", "PSHU", "PULS", "PULU"]:
             if not self.operand_string:
                 raise OperandTypeError("one or more registers must be specified")
 
diff --git a/test/test_integration.py b/test/test_integration.py
index 826e60a..9dd33ea 100644
--- a/test/test_integration.py
+++ b/test/test_integration.py
@@ -864,6 +864,42 @@ def test_multi_word_declaration(self):
         program.translate_statements()
         self.assertEqual([0xDE, 0xAD, 0xBE, 0xEF, 0xCA, 0xFE], program.get_binary_array())
 
+    def test_pshu_regression(self):
+        statements = [
+            Statement("         PSHU A"),
+        ]
+        program = Program()
+        program.statements = statements
+        program.translate_statements()
+        self.assertEquals([0x36, 0x02], program.get_binary_array())
+
+    def test_pshu_multi_regression(self):
+        statements = [
+            Statement("         PSHU A,B"),
+        ]
+        program = Program()
+        program.statements = statements
+        program.translate_statements()
+        self.assertEquals([0x36, 0x06], program.get_binary_array())
+
+    def test_pulu_regression(self):
+        statements = [
+            Statement("         PULU A"),
+        ]
+        program = Program()
+        program.statements = statements
+        program.translate_statements()
+        self.assertEquals([0x37, 0x02], program.get_binary_array())
+
+    def test_pulu_multi_regression(self):
+        statements = [
+            Statement("         PULU A,B"),
+        ]
+        program = Program()
+        program.statements = statements
+        program.translate_statements()
+        self.assertEquals([0x37, 0x06], program.get_binary_array())
+
 # M A I N #####################################################################