diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 00000000..db66bec8
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,9 @@
+version: 2
+updates:
+    # Set update schedule for GitHub Actions
+    - package-ecosystem: "github-actions"
+      directory: "/"
+      schedule:
+          interval: "weekly"
+
+# vim: sw=4
diff --git a/.github/workflows/autopush.yml b/.github/workflows/autopush.yml
index 8afb3425..0fd00a29 100644
--- a/.github/workflows/autopush.yml
+++ b/.github/workflows/autopush.yml
@@ -10,7 +10,7 @@ jobs:
         name: Automatic push to gitlab.tiker.net
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   run: |
                 mkdir ~/.ssh && echo -e "Host gitlab.tiker.net\n\tStrictHostKeyChecking no\n" >> ~/.ssh/config
                 eval $(ssh-agent) && echo "$GITLAB_AUTOPUSH_KEY" | ssh-add -
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2b457261..86afce8a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,9 +12,9 @@ jobs:
         name: Flake8
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -
-            uses: actions/setup-python@v4
+            uses: actions/setup-python@v5
             with:
                 # matches compat target in setup.py
                 python-version: '3.8'
@@ -27,7 +27,7 @@ jobs:
         name: Pylint
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 sed 's/python=3/python=3.7/' .test-conda-env-py3.yml > .test-conda-env.yml
@@ -39,7 +39,7 @@ jobs:
         name: Mypy
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://tiker.net/ci-support-v0
@@ -55,7 +55,7 @@ jobs:
           matrix:
             os: [ubuntu-latest, macos-latest]
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/build-and-test-py-project-within-miniconda.sh
@@ -65,7 +65,7 @@ jobs:
         name: Conda Pytest with Intel CL
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://raw.githubusercontent.com/illinois-scicomp/machine-shop-maintenance/main/install-intel-icd.sh
@@ -84,7 +84,7 @@ jobs:
         name: Conda Pytest without arg check
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/build-and-test-py-project-within-miniconda.sh
@@ -95,7 +95,7 @@ jobs:
         name: Conda Pytest Twice (for cache behavior)
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://tiker.net/ci-support-v0
@@ -108,7 +108,7 @@ jobs:
         name: Conda Examples
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://tiker.net/ci-support-v0
@@ -126,9 +126,9 @@ jobs:
         name: Documentation
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -
-            uses: actions/setup-python@v4
+            uses: actions/setup-python@v5
             with:
                 python-version: '3.x'
         -   name: "Main Script"
@@ -146,7 +146,7 @@ jobs:
         name: Tests for downstream project ${{ matrix.downstream_project }}
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             env:
                 DOWNSTREAM_PROJECT: ${{ matrix.downstream_project }}
@@ -194,8 +194,8 @@ jobs:
             name: Validate CITATION.cff
             runs-on: ubuntu-latest
             steps:
-            -   uses: actions/checkout@v3
-            -   uses: actions/setup-python@v4
+            -   uses: actions/checkout@v4
+            -   uses: actions/setup-python@v5
             -   run: |
                     pip install cffconvert
                     cffconvert -i CITATION.cff --validate
diff --git a/loopy/target/__init__.py b/loopy/target/__init__.py
index be04d100..9e8211a0 100644
--- a/loopy/target/__init__.py
+++ b/loopy/target/__init__.py
@@ -216,7 +216,7 @@ def get_function_definition(
     def get_function_declaration(
             self, codegen_state: CodeGenerationState,
             codegen_result: CodeGenerationResult, schedule_index: int
-            ) -> Tuple[Sequence[Tuple[str, str]], ASTType]:
+            ) -> Tuple[Sequence[Tuple[str, str]], Optional[ASTType]]:
         """Returns preambles and the AST for the function declaration."""
         raise NotImplementedError
 
diff --git a/loopy/target/c/codegen/expression.py b/loopy/target/c/codegen/expression.py
index f0c1fabd..a29325fa 100644
--- a/loopy/target/c/codegen/expression.py
+++ b/loopy/target/c/codegen/expression.py
@@ -448,10 +448,10 @@ def map_constant(self, expr, type_context):
 
             # FIXME: This assumes a 32-bit architecture.
             if isinstance(expr, np.float32):
-                return Literal(repr(expr)+"f")
+                return Literal(repr(float(expr))+"f")
 
             elif isinstance(expr, np.float64):
-                return Literal(repr(expr))
+                return Literal(repr(float(expr)))
 
             # Disabled for now, possibly should be a subtarget.
             # elif isinstance(expr, np.float128):
@@ -464,7 +464,7 @@ def map_constant(self, expr, type_context):
                     suffix += "u"
                 if iinfo.max > (2**31-1):
                     suffix += "l"
-                return Literal(repr(expr)+suffix)
+                return Literal(repr(int(expr))+suffix)
             elif isinstance(expr, np.bool_):
                 return Literal("true") if expr else Literal("false")
             else:
@@ -473,7 +473,7 @@ def map_constant(self, expr, type_context):
 
         elif np.isfinite(expr):
             if type_context == "f":
-                return Literal(repr(np.float32(expr))+"f")
+                return Literal(repr(float((expr)))+"f")
             elif type_context == "d":
                 return Literal(repr(float(expr)))
             elif type_context in ["i", "b"]:
@@ -633,7 +633,19 @@ def join(self, joiner, iterable):
     # }}}
 
     def map_constant(self, expr, prec):
-        return repr(expr)
+        if isinstance(expr, np.generic):
+            if isinstance(expr, np.integer):
+                # FIXME: Add type suffixes?
+                return repr(int(expr))
+            elif isinstance(expr, np.float32):
+                return f"{repr(float(expr))}f"
+            elif isinstance(expr, np.float64):
+                return repr(float(expr))
+            else:
+                raise NotImplementedError(
+                        f"unimplemented numpy-to-C conversion: {type(expr)}")
+        else:
+            return repr(expr)
 
     def map_call(self, expr, enclosing_prec):
         from pymbolic.primitives import Variable
diff --git a/loopy/target/pyopencl.py b/loopy/target/pyopencl.py
index 40963a85..2742e472 100644
--- a/loopy/target/pyopencl.py
+++ b/loopy/target/pyopencl.py
@@ -633,7 +633,7 @@ def generate_value_arg_setup(
 
     from genpy import If, Raise, Statement as S, Suite
 
-    result: List[str] = []
+    result: List[genpy.Generable] = []
     gen = result.append
 
     buf_indices_and_args = []
@@ -717,7 +717,7 @@ def generate_array_arg_setup(
     from loopy.kernel.array import ArrayBase
     from genpy import Statement as S, Suite
 
-    result: List[str] = []
+    result: List[genpy.Generable] = []
     gen = result.append
 
     cl_indices_and_args: List[Union[int, str]] = []
@@ -787,7 +787,7 @@ def get_function_definition(
     def get_function_declaration(
             self, codegen_state: CodeGenerationState,
             codegen_result: CodeGenerationResult, schedule_index: int
-            ) -> Tuple[Sequence[Tuple[str, str]], genpy.Generable]:
+            ) -> Tuple[Sequence[Tuple[str, str]], Optional[genpy.Generable]]:
         # no such thing in Python
         return [], None
 
diff --git a/loopy/target/python.py b/loopy/target/python.py
index f93d2b44..1940dab1 100644
--- a/loopy/target/python.py
+++ b/loopy/target/python.py
@@ -23,7 +23,7 @@
 THE SOFTWARE.
 """
 
-from typing import Tuple, Sequence
+from typing import Optional, Sequence, Tuple
 
 from pymbolic.mapper import Mapper
 from pymbolic.mapper.stringifier import StringifyMapper
@@ -169,7 +169,7 @@ def ast_module(self):
     def get_function_declaration(
             self, codegen_state: CodeGenerationState,
             codegen_result: CodeGenerationResult, schedule_index: int
-            ) -> Tuple[Sequence[Tuple[str, str]], None]:
+            ) -> Tuple[Sequence[Tuple[str, str]], Optional[Generable]]:
         return [], None
 
     def get_function_definition(self, codegen_state, codegen_result,
diff --git a/test/test_fortran.py b/test/test_fortran.py
index 45e83b38..55f1dab1 100644
--- a/test/test_fortran.py
+++ b/test/test_fortran.py
@@ -130,7 +130,9 @@ def test_assign_single_precision_scalar(ctx_factory):
         """
 
     t_unit = lp.parse_fortran(fortran_src)
-    assert "1.1f" in lp.generate_code_v2(t_unit).device_code()
+
+    import re
+    assert re.search("1.1000000[0-9]*f", lp.generate_code_v2(t_unit).device_code())
 
     a_dev = cl.array.empty(queue, 1, dtype=np.float64, order="F")
     t_unit(queue, a=a_dev)