diff --git a/__tests__/crypto-utils.test.ts b/__tests__/cache-utils.test.ts
similarity index 51%
rename from __tests__/crypto-utils.test.ts
rename to __tests__/cache-utils.test.ts
index 854608c..da0e35a 100644
--- a/__tests__/crypto-utils.test.ts
+++ b/__tests__/cache-utils.test.ts
@@ -1,10 +1,10 @@
-import * as cryptoUtils from '../src/crypto-utils'
+import * as cacheUtils from '../src/cache-utils'
 import * as path from 'path'
 
-describe('crypto-utils', () => {
+describe('cacheUtils-utils', () => {
     describe('can hash', () => {
         it('a directory', async () => {
-            const hash = await cryptoUtils.hashFiles(
+            const hash = await cacheUtils.hashFiles(
                 path.resolve('__tests__/data/crypto-utils-test/gradle')
             )
             expect(hash).toBe(
@@ -14,7 +14,7 @@ describe('crypto-utils', () => {
             )
         })
         it('a directory with a glob', async () => {
-            const hash = await cryptoUtils.hashFiles(
+            const hash = await cacheUtils.hashFiles(
                 path.resolve('__tests__/data/crypto-utils-test/'),
                 ['gradle/**']
             )
@@ -25,7 +25,7 @@ describe('crypto-utils', () => {
             )
         })
         it('a directory with globs', async () => {
-            const hash = await cryptoUtils.hashFiles(
+            const hash = await cacheUtils.hashFiles(
                 path.resolve('__tests__/data/crypto-utils-test/'),
                 ['**/*.gradle', 'gradle/**']
             )
@@ -36,4 +36,30 @@ describe('crypto-utils', () => {
             )
         })
     })
+    describe('can truncate args', () => {
+        test('handles zero-length string', () => {
+            expect(cacheUtils.truncateArgs('')).toBe('')
+        })
+        test('leaves short string untouched', () => {
+            expect(
+                cacheUtils.truncateArgs('short string that-should-be-untouched')
+            ).toBe('short string that-should-be-untouched')
+        })
+        test('truncates long string', () => {
+            const longString = 'a'.repeat(500)
+            expect(cacheUtils.truncateArgs(longString)).toBe('a'.repeat(400))
+        })
+        test('trims leading and trailing whitespace', () => {
+            expect(cacheUtils.truncateArgs('    this is an arg      ')).toBe(
+                'this is an arg'
+            )
+        })
+        test('removes repeated whitespace', () => {
+            expect(
+                cacheUtils.truncateArgs(
+                    '   this     one     has long   \t\n\t\r  spaces    '
+                )
+            ).toBe('this one has long spaces')
+        })
+    })
 })
diff --git a/src/cache-configuration.ts b/src/cache-configuration.ts
index ebf62bc..432c82b 100644
--- a/src/cache-configuration.ts
+++ b/src/cache-configuration.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs'
 import * as core from '@actions/core'
 import * as cache from '@actions/cache'
 
-import * as crypto from './crypto-utils'
+import * as cacheUtils from './cache-utils'
 
 import {
     inputCacheKeyGlobs,
@@ -35,10 +35,11 @@ export async function restoreCachedConfiguration(
     const cacheKeyPrefix = 'configuration|'
 
     const args = core.getInput('arguments')
-    const cacheKeyWithArgs = `${cacheKeyPrefix}${args}|`
+    const argsKey = cacheUtils.truncateArgs(args)
+    const cacheKeyWithArgs = `${cacheKeyPrefix}${argsKey}|`
 
     const cacheKeyGlobs = inputCacheKeyGlobs('configuration-cache-key')
-    const hash = await crypto.hashFiles(rootDir, cacheKeyGlobs)
+    const hash = await cacheUtils.hashFiles(rootDir, cacheKeyGlobs)
     const cacheKey = `${cacheKeyWithArgs}${hash}`
 
     core.saveState(CONFIGURATION_CACHE_KEY, cacheKey)
diff --git a/src/cache-dependencies.ts b/src/cache-dependencies.ts
index d1525eb..8bae134 100644
--- a/src/cache-dependencies.ts
+++ b/src/cache-dependencies.ts
@@ -5,7 +5,7 @@ import * as os from 'os'
 import * as core from '@actions/core'
 import * as cache from '@actions/cache'
 
-import * as crypto from './crypto-utils'
+import * as cacheUtils from './cache-utils'
 
 const DEPENDENCIES_CACHE_PATH = 'DEPENDENCIES_CACHE_PATH'
 const DEPENDENCIES_CACHE_KEY = 'DEPENDENCIES_CACHE_KEY'
@@ -24,10 +24,11 @@ export async function restoreCachedDependencies(
     const cacheKeyPrefix = 'dependencies|'
 
     const args = core.getInput('arguments')
-    const cacheKeyWithArgs = `${cacheKeyPrefix}${args}|`
+    const argsKey = cacheUtils.truncateArgs(args)
+    const cacheKeyWithArgs = `${cacheKeyPrefix}${argsKey}|`
 
     const cacheKeyGlobs = inputCacheKeyGlobs('dependencies-cache-key')
-    const hash = await crypto.hashFiles(rootDir, cacheKeyGlobs)
+    const hash = await cacheUtils.hashFiles(rootDir, cacheKeyGlobs)
     const cacheKey = `${cacheKeyWithArgs}${hash}`
 
     core.saveState(DEPENDENCIES_CACHE_KEY, cacheKey)
diff --git a/src/crypto-utils.ts b/src/cache-utils.ts
similarity index 77%
rename from src/crypto-utils.ts
rename to src/cache-utils.ts
index 4a5a123..1a7195f 100644
--- a/src/crypto-utils.ts
+++ b/src/cache-utils.ts
@@ -11,3 +11,7 @@ export async function hashFiles(
         .join('\n')
     return glob.hashFiles(combinedPatterns, {followSymbolicLinks})
 }
+
+export function truncateArgs(args: string): string {
+    return args.trim().replace(/\s+/g, ' ').substr(0, 400)
+}