diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6101e7f32b2684adc49d21075339a057ac92ccfa..0fb2f9ebbca30286289945f629b60611fdc92654 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+1.5.1
+=====
+Fixes:
+------
+* Add gcc version guard to the Makefile (#164), thanks @juvasquezg
+* Fix incorrect free in `cJSON_Utils` if custom memory allocator is used (#166), thanks @prefetchnta
+
 1.5.0
 =====
 Features:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c37381b5adcd5de2716fdaa43473367905c9aeba..029bb296703a3f7a71602f7267727dc9eb01451e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@ project(cJSON C)
 
 set(PROJECT_VERSION_MAJOR 1)
 set(PROJECT_VERSION_MINOR 5)
-set(PROJECT_VERSION_PATCH 0)
+set(PROJECT_VERSION_PATCH 1)
 set(CJSON_VERSION_SO 1)
 set(CJSON_UTILS_VERSION_SO 1)
 set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
diff --git a/Makefile b/Makefile
index d22615c804112b91b619237856076004a8bada02..42ebb67e2ef02ea41f1975be0c1455eda655e2e4 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ CJSON_TEST_SRC = cJSON.c test.c
 
 LDLIBS = -lm
 
-LIBVERSION = 1.5.0
+LIBVERSION = 1.5.1
 CJSON_SOVERSION = 1
 UTILS_SOVERSION = 1
 
diff --git a/cJSON.c b/cJSON.c
index e653a1c013ead4cff53c9c611f4b443e0f053ee4..cb3bf13a65018b8d7ccf96344b1c68b15cfbf0c5 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -58,7 +58,7 @@ CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void)
 }
 
 /* This is a safeguard to prevent copy-pasters from using incompatible C and header files */
-#if (CJSON_VERSION_MAJOR != 1) || (CJSON_VERSION_MINOR != 5) || (CJSON_VERSION_PATCH != 0)
+#if (CJSON_VERSION_MAJOR != 1) || (CJSON_VERSION_MINOR != 5) || (CJSON_VERSION_PATCH != 1)
     #error cJSON.h and cJSON.c have different versions. Make sure that both have the same.
 #endif
 
diff --git a/cJSON.h b/cJSON.h
index 622bcf58019ea9669354516b1195a4db2710a55c..97d6e82af65dd22b8a6ee0ce17ba0218e8e21d66 100644
--- a/cJSON.h
+++ b/cJSON.h
@@ -31,7 +31,7 @@ extern "C"
 /* project version */
 #define CJSON_VERSION_MAJOR 1
 #define CJSON_VERSION_MINOR 5
-#define CJSON_VERSION_PATCH 0
+#define CJSON_VERSION_PATCH 1
 
 #include <stddef.h>