diff --git a/.travis.yml b/.travis.yml
index e1258da9..61b1a14d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,7 +25,7 @@ matrix:
             - binfmt-support
     - env: >
         TARGET=arm-unknown-linux-gnueabihf
-        BUILD_OPENSSL_VERSION=1.1.0b
+        BUILD_OPENSSL_VERSION=1.1.0c
         CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc
         QEMU_LD_PREFIX=/usr/arm-linux-gnueabihf
         RUST_TEST_THREADS=1
@@ -46,7 +46,7 @@ matrix:
 
     # 64-bit version compat
     - env: BUILD_OPENSSL_VERSION=1.0.2h
-    - env: BUILD_OPENSSL_VERSION=1.1.0b
+    - env: BUILD_OPENSSL_VERSION=1.1.0c
 
     # 32-bit version compat
     - env: TARGET=i686-unknown-linux-gnu BUILD_OPENSSL_VERSION=1.0.1u
@@ -59,7 +59,7 @@ matrix:
         apt:
           packages:
             - gcc-multilib
-    - env: TARGET=i686-unknown-linux-gnu BUILD_OPENSSL_VERSION=1.1.0b
+    - env: TARGET=i686-unknown-linux-gnu BUILD_OPENSSL_VERSION=1.1.0c
       addons:
         apt:
           packages:
diff --git a/appveyor.yml b/appveyor.yml
index 3e23044e..9b4a3f02 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,10 +5,10 @@ environment:
     - TARGET: i686-pc-windows-gnu
       BITS: 32
       MSYS2: 1
-      OPENSSL_VERSION: 1_1_0b
+      OPENSSL_VERSION: 1_1_0c
     - TARGET: x86_64-pc-windows-msvc
       BITS: 64
-      OPENSSL_VERSION: 1_1_0b
+      OPENSSL_VERSION: 1_1_0c
       OPENSSL_DIR: C:\OpenSSL
 
     # 1.0.2, 64/32 bit