diff --git a/loopy/codegen/__init__.py b/loopy/codegen/__init__.py
index 42f383f3f92b809384c21e7684b2d80e23a564ee..79adb922d69c6eb81212fd061e667b6529bc6852 100644
--- a/loopy/codegen/__init__.py
+++ b/loopy/codegen/__init__.py
@@ -28,7 +28,7 @@ from loopy.diagnostic import LoopyError, warn
 from pytools import ImmutableRecord
 import islpy as isl
 
-from pytools.persistent_dict import WriteOncePersistentDict, ReadOnlyEntryError
+from pytools.persistent_dict import WriteOncePersistentDict
 from loopy.tools import LoopyKeyBuilder
 from loopy.version import DATA_MODEL_VERSION
 
@@ -516,10 +516,7 @@ def generate_code_v2(kernel):
     logger.info("%s: generate code: done" % kernel.name)
 
     if CACHING_ENABLED:
-        try:
-            code_gen_cache[input_kernel] = codegen_result
-        except ReadOnlyEntryError:
-            pass
+        code_gen_cache.store_if_not_present(input_kernel, codegen_result)
 
     return codegen_result
 
diff --git a/loopy/execution.py b/loopy/execution.py
index f510a4389280b9efa6928b241e07eb2d304f9bd2..a1228f8f3bb3493e83936ee0b3998bbd5b8cdcc2 100644
--- a/loopy/execution.py
+++ b/loopy/execution.py
@@ -31,7 +31,7 @@ from loopy.diagnostic import LoopyError
 import logging
 logger = logging.getLogger(__name__)
 
-from pytools.persistent_dict import WriteOncePersistentDict, ReadOnlyEntryError
+from pytools.persistent_dict import WriteOncePersistentDict
 from loopy.tools import LoopyKeyBuilder
 from loopy.version import DATA_MODEL_VERSION
 
@@ -204,10 +204,7 @@ class KernelExecutorBase(object):
         kernel = self.get_typed_and_scheduled_kernel_uncached(arg_to_dtype_set)
 
         if CACHING_ENABLED:
-            try:
-                typed_and_scheduled_cache[cache_key] = kernel
-            except ReadOnlyEntryError:
-                pass
+            typed_and_scheduled_cache.store_if_not_present(cache_key, kernel)
 
         return kernel
 
diff --git a/loopy/preprocess.py b/loopy/preprocess.py
index 40a782a44221facf1fe8cc1b0d0210219b86cbae..29d8888ae3b0e488ab82beb4b654106988bcf803 100644
--- a/loopy/preprocess.py
+++ b/loopy/preprocess.py
@@ -30,7 +30,7 @@ from loopy.diagnostic import (
 
 import islpy as isl
 
-from pytools.persistent_dict import WriteOncePersistentDict, ReadOnlyEntryError
+from pytools.persistent_dict import WriteOncePersistentDict
 
 from loopy.tools import LoopyKeyBuilder
 from loopy.version import DATA_MODEL_VERSION
@@ -2127,10 +2127,7 @@ def preprocess_kernel(kernel, device=None):
     # }}}
 
     if CACHING_ENABLED:
-        try:
-            preprocess_cache[input_kernel] = kernel
-        except ReadOnlyEntryError:
-            pass
+        preprocess_cache.store_if_not_present(input_kernel, kernel)
 
     return kernel
 
diff --git a/loopy/schedule/__init__.py b/loopy/schedule/__init__.py
index 221fcf3e0bb601f849d528086c7dbe02f5fc6774..3d47a5ec5ff33f7d8184acd8fde92aeaf1855378 100644
--- a/loopy/schedule/__init__.py
+++ b/loopy/schedule/__init__.py
@@ -29,7 +29,7 @@ import sys
 import islpy as isl
 from loopy.diagnostic import warn_with_kernel, LoopyError  # noqa
 
-from pytools.persistent_dict import WriteOncePersistentDict, ReadOnlyEntryError
+from pytools.persistent_dict import WriteOncePersistentDict
 from loopy.tools import LoopyKeyBuilder
 from loopy.version import DATA_MODEL_VERSION
 
@@ -1972,10 +1972,7 @@ def get_one_scheduled_kernel(kernel):
             kernel.name, time()-start_time))
 
     if CACHING_ENABLED and not from_cache:
-        try:
-            schedule_cache[sched_cache_key] = result
-        except ReadOnlyEntryError:
-            pass
+        schedule_cache.store_if_not_present(sched_cache_key, result)
 
     return result
 
diff --git a/loopy/transform/buffer.py b/loopy/transform/buffer.py
index a5084403819e46efb2710af4e1080c65947508fc..52ae505d8e18797bf8746433c311ff0edeb1988c 100644
--- a/loopy/transform/buffer.py
+++ b/loopy/transform/buffer.py
@@ -29,7 +29,7 @@ from loopy.symbolic import (get_dependencies,
         RuleAwareIdentityMapper, SubstitutionRuleMappingContext,
         SubstitutionMapper)
 from pymbolic.mapper.substitutor import make_subst_func
-from pytools.persistent_dict import WriteOncePersistentDict, ReadOnlyEntryError
+from pytools.persistent_dict import WriteOncePersistentDict
 from loopy.tools import LoopyKeyBuilder, PymbolicExpressionHashWrapper
 from loopy.version import DATA_MODEL_VERSION
 from loopy.diagnostic import LoopyError
@@ -532,10 +532,7 @@ def buffer_array(kernel, var_name, buffer_inames, init_expression=None,
 
     if CACHING_ENABLED:
         from loopy.preprocess import prepare_for_caching
-        try:
-            buffer_array_cache[cache_key] = prepare_for_caching(kernel)
-        except ReadOnlyEntryError:
-            pass
+        buffer_array_cache.store_if_not_present(cache_key, prepare_for_caching(kernel))
 
     return kernel
 
diff --git a/setup.py b/setup.py
index e1726772d06c70af89c3a0b2bc1947c30d0b5672..94843bf69e4e25677ccc0713e5f598e9dcfd55e2 100644
--- a/setup.py
+++ b/setup.py
@@ -37,7 +37,7 @@ setup(name="loo.py",
           ],
 
       install_requires=[
-          "pytools>=2017.5",
+          "pytools>=2017.6",
           "pymbolic>=2016.2",
           "genpy>=2016.1.2",
           "cgen>=2016.1",