diff --git a/CHANGELOG.md b/CHANGELOG.md
index 384a843..73b3514 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 All notable changes to the LaunchDarkly Node.js SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [5.1.2] - 2018-07-26
+
+### Removed:
+- Removed a dependency on the deprecated [`crypto`](https://www.npmjs.com/package/crypto) module. ([#92](https://github.com/launchdarkly/node-client/issues/92))
+
 ## [5.1.1] - 2018-07-19
 
 ### Fixed:
diff --git a/package-lock.json b/package-lock.json
index 3d9a264..3885b9c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ldclient-node",
-  "version": "5.1.0",
+  "version": "5.1.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -72,14 +72,14 @@
       }
     },
     "ajv": {
-      "version": "5.2.3",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.2.3.tgz",
-      "integrity": "sha1-wG9Zh3jETGsWGrr+NGa4GtGBTtI=",
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "requires": {
         "co": "4.6.0",
-        "fast-deep-equal": "1.0.0",
-        "json-schema-traverse": "0.3.1",
-        "json-stable-stringify": "1.0.1"
+        "fast-deep-equal": "1.1.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
       }
     },
     "align-text": {
@@ -817,14 +817,6 @@
         "inherits": "2.0.3"
       }
     },
-    "boom": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/boom/-/boom-4.3.1.tgz",
-      "integrity": "sha1-T4owBctKfjiJ90kDD9JbluAdLjE=",
-      "requires": {
-        "hoek": "4.2.1"
-      }
-    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -1191,29 +1183,6 @@
         "which": "1.3.0"
       }
     },
-    "cryptiles": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-3.1.2.tgz",
-      "integrity": "sha1-qJ+7Ig9c4l7FboxKqKT9e1sNKf4=",
-      "requires": {
-        "boom": "5.2.0"
-      },
-      "dependencies": {
-        "boom": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/boom/-/boom-5.2.0.tgz",
-          "integrity": "sha512-Z5BTk6ZRe4tXXQlkqftmsAUANpXmuwlsF5Oov8ThoMbQRzdGTA1ngYRW160GexgOgjsFOKJz0LYhoNi+2AMBUw==",
-          "requires": {
-            "hoek": "4.2.1"
-          }
-        }
-      }
-    },
-    "crypto": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/crypto/-/crypto-0.0.3.tgz",
-      "integrity": "sha1-RwqBuGvkxe4XrMggeh9TFa4g27A="
-    },
     "cssom": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.2.tgz",
@@ -1584,9 +1553,14 @@
       "integrity": "sha1-Ys8SAjTGg3hdkCNIqADvPgzCC8A="
     },
     "fast-deep-equal": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.0.0.tgz",
-      "integrity": "sha1-liVqO8l1WV6zbYLpkp0GDYk0Of8="
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
+      "integrity": "sha1-wFNHeBfIa1HaqFPIHgWbcz0CNhQ="
+    },
+    "fast-json-stable-stringify": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz",
+      "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I="
     },
     "fast-levenshtein": {
       "version": "2.0.6",
@@ -1668,13 +1642,23 @@
       "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE="
     },
     "form-data": {
-      "version": "2.3.1",
-      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.1.tgz",
-      "integrity": "sha1-b7lPvXGIUwbXPRXMSX/kzE7NRL8=",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.2.tgz",
+      "integrity": "sha1-SXBJi+YEwgwAXU9cI67NIda0kJk=",
       "requires": {
         "asynckit": "0.4.0",
-        "combined-stream": "1.0.5",
+        "combined-stream": "1.0.6",
         "mime-types": "2.1.17"
+      },
+      "dependencies": {
+        "combined-stream": {
+          "version": "1.0.6",
+          "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+          "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+          "requires": {
+            "delayed-stream": "1.0.0"
+          }
+        }
       }
     },
     "fragment-cache": {
@@ -2098,7 +2082,7 @@
       "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.0.3.tgz",
       "integrity": "sha1-ukAsJmGU8VlW7xXg/PJCmT9qff0=",
       "requires": {
-        "ajv": "5.2.3",
+        "ajv": "5.5.2",
         "har-schema": "2.0.0"
       }
     },
@@ -2193,17 +2177,6 @@
         }
       }
     },
-    "hawk": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/hawk/-/hawk-6.0.2.tgz",
-      "integrity": "sha512-miowhl2+U7Qle4vdLqDdPt9m09K6yZhkLDTWGoUiUzrQCn+mHHSmfJgAyGaLRZbPmTqfFFjRV1QWCW0VWUJBbQ==",
-      "requires": {
-        "boom": "4.3.1",
-        "cryptiles": "3.1.2",
-        "hoek": "4.2.1",
-        "sntp": "2.0.2"
-      }
-    },
     "hoek": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/hoek/-/hoek-4.2.1.tgz",
@@ -3113,7 +3086,7 @@
         "nwmatcher": "1.4.4",
         "parse5": "4.0.0",
         "pn": "1.1.0",
-        "request": "2.85.0",
+        "request": "2.87.0",
         "request-promise-native": "1.0.5",
         "sax": "1.2.4",
         "symbol-tree": "3.2.2",
@@ -4420,9 +4393,9 @@
       }
     },
     "request": {
-      "version": "2.85.0",
-      "resolved": "https://registry.npmjs.org/request/-/request-2.85.0.tgz",
-      "integrity": "sha512-8H7Ehijd4js+s6wuVPLjwORxD4zeuyjYugprdOXlPSqaApmL/QOy+EB/beICHVCHkGMKNh5rvihb5ov+IDw4mg==",
+      "version": "2.87.0",
+      "resolved": "https://registry.npmjs.org/request/-/request-2.87.0.tgz",
+      "integrity": "sha512-fcogkm7Az5bsS6Sl0sibkbhcKsnyon/jV1kF3ajGmF0c8HrttdKTPRT9hieOaQHA5HEq6r8OyWOo/o781C1tNw==",
       "requires": {
         "aws-sign2": "0.7.0",
         "aws4": "1.6.0",
@@ -4430,9 +4403,8 @@
         "combined-stream": "1.0.5",
         "extend": "3.0.1",
         "forever-agent": "0.6.1",
-        "form-data": "2.3.1",
+        "form-data": "2.3.2",
         "har-validator": "5.0.3",
-        "hawk": "6.0.2",
         "http-signature": "1.2.0",
         "is-typedarray": "1.0.0",
         "isstream": "0.1.2",
@@ -4442,7 +4414,6 @@
         "performance-now": "2.1.0",
         "qs": "6.5.1",
         "safe-buffer": "5.1.1",
-        "stringstream": "0.0.5",
         "tough-cookie": "2.3.3",
         "tunnel-agent": "0.6.0",
         "uuid": "3.1.0"
@@ -4456,7 +4427,7 @@
         "lodash.assign": "4.2.0",
         "lodash.clonedeep": "4.5.0",
         "lru-cache": "4.1.2",
-        "request": "2.85.0"
+        "request": "2.87.0"
       }
     },
     "request-promise-core": {
@@ -5040,14 +5011,6 @@
         "kind-of": "3.2.2"
       }
     },
-    "sntp": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/sntp/-/sntp-2.0.2.tgz",
-      "integrity": "sha1-UGQRDwr4X3z9t9a2ekACjOUrSys=",
-      "requires": {
-        "hoek": "4.2.1"
-      }
-    },
     "source-map": {
       "version": "0.5.7",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -5727,7 +5690,7 @@
     },
     "tunnel": {
       "version": "https://github.com/launchdarkly/node-tunnel/tarball/d860e57650cce1ea655d00854c81babe6b47e02c",
-      "integrity": "sha1-DxkgfzcgRtPUaCGDy+INSgR8zdk="
+      "integrity": "sha512-prl+yIntUTIhkHoz2YtT7xtcAoMEgfsm+RL2bUGFI6e229NTICfo+jFKj1UFCDqc1wm/SQK7TM2U06sgeoO9jQ=="
     },
     "tunnel-agent": {
       "version": "0.6.0",
diff --git a/package.json b/package.json
index 6be5295..c74e56a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ldclient-node",
-  "version": "5.1.1",
+  "version": "5.1.2",
   "description": "LaunchDarkly SDK for Node.js",
   "main": "index.js",
   "scripts": {
@@ -24,7 +24,6 @@
   "dependencies": {
     "@types/redis": "2.8.6",
     "async": "2.6.0",
-    "crypto": "0.0.3",
     "hoek": "4.2.1",
     "lrucache": "^1.0.3",
     "node-cache": "^3.2.1",